<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-2422</journal-id>
<journal-title><![CDATA[Tecnología y ciencias del agua]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnol. cienc. agua]]></abbrev-journal-title>
<issn>2007-2422</issn>
<publisher>
<publisher-name><![CDATA[Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-24222017000200117</article-id>
<article-id pub-id-type="doi">10.24850/j-tyca-2017-02-11</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Simulation for non-point source pollution based on QUAL2E in the Jinghe River, Shaanxi Province, China]]></article-title>
<article-title xml:lang="es"><![CDATA[Simulación de contaminación difusa mediante el modelo QUAL2E en el río Jinghe, provincia de Shaanxi, China]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Jucui]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huo]]></surname>
<given-names><![CDATA[Aidi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hu]]></surname>
<given-names><![CDATA[Anyan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Xuezhen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[Yanqing]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Chang&#8217;an University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Shanghai Jiaotong University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>2</numero>
<fpage>117</fpage>
<lpage>126</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222017000200117&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222017000200117&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222017000200117&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Water pollution in river basins is significantly influenced by point-source and non-point-source pollutants. Compared with point-source pollutants, the identification and quantification of non-point-source pollutants are critical but difficult issues in water environmental pollution studies. The Jinghe River is one of the main tributaries of the Weihe River. However, the non-point-source pollution of this river is not well understood. In order to analyze the sources of point- and non-point loads to river water, the river water quality model QUAL2E and Principal Component Analysis (PCA) &amp; Factor Analysis (FA) were applied simultaneously to calculate the point- and non-point-source loads of ammonia nitrogen and nitrate nitrogen, respectively, in dry and wet seasons from 2002 to 2007. The results show that NO3--N can be associated with point-source pollution, such as domestic sewage in dry seasons, but non-point-source pollution generated by precipitation in wet seasons. NH4+-N can be associated with point-source pollution throughout the year. The methods applied in this research provide reliable results on non-point-source pollution caused by storm runoff.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La contaminación del agua en cuencas hidrológicas tiene una fuerte influencia de contaminantes puntuales y difusos. En comparación con los contaminantes puntuales, la identificación y cuantificación de los contaminantes difusos es un tema de gran importancia, pero difícil, en los estudios de contaminación ambiental del agua. El río Jinghe es uno de los principales tributarios del río Weihe; sin embargo, la contaminación difusa de este río no se ha dilucidado del todo. Con el fin de analizar las fuentes de cargas puntuales y difusas hacia el agua del río se aplicaron simultáneamente el modelo QUAL2E, el Análisis de Componente Principal (PCA) y el Análisis de Factores (FA) para calcular las cargas puntuales y difusas de nitrógeno amoniacal y de nitrógeno nítrico, respectivamente, en las temporadas seca y húmeda de 2002 a 2007. Los resultados muestran que el NO3N puede estar asociado con contaminación puntual, como la producida por aguas residuales domésticas, en la temporada seca, pero con la contaminación difusa generada por la precipitación en las temporadas húmedas. El NH4+N puede estar asociado con la contaminación puntual durante todo el año. Los métodos aplicados en este estudio proporcionan resultados confiables en la contaminación difusa ocasionada por escurrimientos pluviales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[QUAL2E]]></kwd>
<kwd lng="en"><![CDATA[degradation coefficient]]></kwd>
<kwd lng="en"><![CDATA[source/sink term]]></kwd>
<kwd lng="en"><![CDATA[non-point-source pollution]]></kwd>
<kwd lng="es"><![CDATA[QUAL2E]]></kwd>
<kwd lng="es"><![CDATA[coeficiente de degradación]]></kwd>
<kwd lng="es"><![CDATA[término fuente/sumidero]]></kwd>
<kwd lng="es"><![CDATA[contaminación difusa]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Combined use of the EPA-QUAL2E simulation model and factor analysis to assess the source apportionment of point and nonpoint loads of nutrients to surface waters]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Azzellino]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Salvetti]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Vismara]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Bonomo]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Science of the Total Environment]]></source>
<year>2006</year>
<volume>371</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>214-22</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Water quality modeling: A review of the analysis of uncertainty]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Beck]]></surname>
<given-names><![CDATA[M. B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Water Resources Research]]></source>
<year>1987</year>
<volume>23</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>1393-442</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Decision support framework for the assessment of non-point-source pollution of groundwater in large irrigation projects]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chowdary]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Rao]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Sarma]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Agricultural Water Management]]></source>
<year>2005</year>
<volume>75</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>194-225</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Prediction of output loading of nitrogen and phosphorus from Qiandao Lake watershed based on AnnAGNPS Model]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Feier]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Huanchun]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Yingxu]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Dong]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[Transactions of the Chinese Society of Agricultural Engineering]]></source>
<year>2003</year>
<volume>19</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>281-4</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Study on the application AnnAGNPS and SWAT to non-point resource pollution research: A case of Yanting agro-ecological experimental station. Chinese Academy of Sciences]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gao]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhou]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhi]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Tang]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Shanghai Jiaotong University (Agricultural Science)]]></source>
<year>2008</year>
<volume>6</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>567-72</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Partial least-squares regression: A tutorial]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Geladi]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Kowalski]]></surname>
<given-names><![CDATA[B. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Analytica Chimica Acta]]></source>
<year>1986</year>
<volume>185</volume>
<page-range>1-17</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Simulation of agricultural non-point pollution based on AnnAGNPS model]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Guihong]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Jiangyong]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Transactions of the Chinese Society of Agricultural Engineering]]></source>
<year>2007</year>
<volume>23</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>11-7</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Multispectral remote sensing inversion for city landscape water eutrophication based on genetic algorithm-support vector machine]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Qiao]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Xie]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
</person-group>
<source><![CDATA[Water Quality Research Journal of Canada]]></source>
<year>2014</year>
<volume>49</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>285-93</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Assessment of groundwater quality for irrigation purposes and identification of hydrogeochemical evolution mechanisms in Pengyang County, China]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Qian]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental Earth Sciences]]></source>
<year>2013</year>
<volume>69</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>2211-25</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Major ion chemistry of shallow groundwater in the Dongsheng Coalfield, Ordos Basin, China]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Qian]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Mine Water and the Environment]]></source>
<year>2013</year>
<volume>32</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>195-206</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Accelerate research on land creation]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Qian]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Nature]]></source>
<year>2014</year>
<volume>510</volume>
<numero>7503</numero>
<issue>7503</issue>
<page-range>29-31</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Building a new and sustainable &#8220;Silk road economic belt&#8221;]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Qian]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Howard]]></surname>
<given-names><![CDATA[K. W. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental Earth Sciences]]></source>
<year>2015</year>
<volume>74</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>7267-70</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Key sources of uncertainty in QUAL2E model of Passaic River]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Melching]]></surname>
<given-names><![CDATA[C. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Yoon]]></surname>
<given-names><![CDATA[C. G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Water Resources Planning and Management]]></source>
<year>1996</year>
<volume>122</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>105-13</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[River pollution from non-point sources: A new simplified method of assessment]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Munafo]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Cecchi]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Baiocco]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Mancini]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Management]]></source>
<year>2005</year>
<volume>77</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>93-8</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Application of principal component and factor analysis to evaluate surface water quality monitoring network]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ouyang]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[Water Research]]></source>
<year>2005</year>
<volume>39</volume>
<numero>20</numero>
<issue>20</issue>
<page-range>2621-35</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Assessment of seasonal variations in surface water quality]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ouyang]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Nkedi-Kizza]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[Q.]]></given-names>
</name>
<name>
<surname><![CDATA[Shinde]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Huang]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Water Research]]></source>
<year>2006</year>
<volume>40</volume>
<numero>20</numero>
<issue>20</issue>
<page-range>3800-10</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Evaluation of a non-point source pollution model, AnnAGNPS, in a tropical watershed]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Polyakov]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Fares]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kubo]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Jacobi]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental Modelling &amp; Software]]></source>
<year>2007</year>
<volume>22</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>1617-27</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Water quality prediction and probability network models]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reckhow]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Canadian Journal of Fisheries and Aquatic Sciences]]></source>
<year>1999</year>
<volume>56</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>1150-8</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Assessment of surface water quality using multivariate statistical techniques: A case study of the Fuji river basin, Japan]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shrestha]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Kazama]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental Modelling &amp; Software]]></source>
<year>2007</year>
<volume>22</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>464-75</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Spatial and temporal distribution of surface water quality using multivariate statistical analysis in Jinghe River of Shaanxi Province, China]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[Y. Q.]]></given-names>
</name>
<name>
<surname><![CDATA[Dang]]></surname>
<given-names><![CDATA[B. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Xu]]></surname>
<given-names><![CDATA[Z. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Hu]]></surname>
<given-names><![CDATA[A. Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[X. Z.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Natural Resources]]></source>
<year>2012</year>
<volume>27</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>674-85</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Steady state and dynamic modelling of nitrogen in the River Kennet: Impacts of land use change since the 1930s]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Whitehead]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Johnes]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Butterfield]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Science of the Total Environment]]></source>
<year>2002</year>
<volume>282</volume>
<page-range>417-34</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Using correlation and multivariate statistical analysis to identify hydrogeochemical processes affecting the major ion chemistry of waters: Case study in Laoheba phosphorite mine in Sichuan, China]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Qian]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Duan]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
</person-group>
<source><![CDATA[Arabian Journal of Geosciences]]></source>
<year>2014</year>
<volume>7</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>3973-82</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Xiaohua]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Ruiming]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Yong]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environment statistics analysis]]></source>
<year>2008</year>
<page-range>164-9</page-range><publisher-loc><![CDATA[Beijing ]]></publisher-loc>
<publisher-name><![CDATA[Beijing Normal University Press]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
