Spatial variability of soil nitrogen in a hilly valley: Multiscale patterns and affecting factors.
Identifieur interne : 000652 ( Ncbi/Checkpoint ); précédent : 000651; suivant : 000653Spatial variability of soil nitrogen in a hilly valley: Multiscale patterns and affecting factors.
Auteurs : Shirong Zhang [République populaire de Chine] ; Chunlan Xia [République populaire de Chine] ; Ting Li [République populaire de Chine] ; Chungui Wu [République populaire de Chine] ; Ouping Deng [République populaire de Chine] ; Qinmei Zhong [République populaire de Chine] ; Xiaoxun Xu [République populaire de Chine] ; Yun Li [République populaire de Chine] ; Yongxia Jia [République populaire de Chine]Source :
- The Science of the total environment [ 1879-1026 ] ; 2016.
Abstract
Estimating the spatial distribution of soil nitrogen at different scales is crucial for improving soil nitrogen use efficiency and controlling nitrogen pollution. We evaluated the spatial variability of soil total nitrogen (TN) and available nitrogen (AN) in the Fujiang River Valley, a typical hilly region composed of low, medium and high hills in the central Sichuan Basin, China. We considered the two N forms at single hill, landscape and valley scales using a combined method of classical statistics, geostatistics and a geographic information system. The spatial patterns and grading areas of soil TN and AN were different among hill types and different scales. The percentages of higher grades of the two nitrogen forms decreased from low, medium to high hills. Hill type was a major factor determining the spatial variability of the two nitrogen forms across multiple scales in the valley. The main effects of general linear models indicated that the key affecting factors of soil TN and AN were hill type and fertilization at the single hill scale, hill type and soil type at the landscape scale, and hill type, slope position, parent material, soil type, land use and fertilization at the valley scale. Thus, the effects of these key factors on the two soil nitrogen forms became more significant with upscaling.
DOI: 10.1016/j.scitotenv.2016.04.111
PubMed: 27135562
Affiliations:
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We evaluated the spatial variability of soil total nitrogen (TN) and available nitrogen (AN) in the Fujiang River Valley, a typical hilly region composed of low, medium and high hills in the central Sichuan Basin, China. We considered the two N forms at single hill, landscape and valley scales using a combined method of classical statistics, geostatistics and a geographic information system. The spatial patterns and grading areas of soil TN and AN were different among hill types and different scales. The percentages of higher grades of the two nitrogen forms decreased from low, medium to high hills. Hill type was a major factor determining the spatial variability of the two nitrogen forms across multiple scales in the valley. The main effects of general linear models indicated that the key affecting factors of soil TN and AN were hill type and fertilization at the single hill scale, hill type and soil type at the landscape scale, and hill type, slope position, parent material, soil type, land use and fertilization at the valley scale. Thus, the effects of these key factors on the two soil nitrogen forms became more significant with upscaling.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Zhang, Shirong" sort="Zhang, Shirong" uniqKey="Zhang S" first="Shirong" last="Zhang">Shirong Zhang</name></noRegion><name sortKey="Deng, Ouping" sort="Deng, Ouping" uniqKey="Deng O" first="Ouping" last="Deng">Ouping Deng</name><name sortKey="Jia, Yongxia" sort="Jia, Yongxia" uniqKey="Jia Y" first="Yongxia" last="Jia">Yongxia Jia</name><name sortKey="Li, Ting" sort="Li, Ting" uniqKey="Li T" first="Ting" last="Li">Ting Li</name><name sortKey="Li, Yun" sort="Li, Yun" uniqKey="Li Y" first="Yun" last="Li">Yun Li</name><name sortKey="Wu, Chungui" sort="Wu, Chungui" uniqKey="Wu C" first="Chungui" last="Wu">Chungui Wu</name><name sortKey="Xia, Chunlan" sort="Xia, Chunlan" uniqKey="Xia C" first="Chunlan" last="Xia">Chunlan Xia</name><name sortKey="Xu, Xiaoxun" sort="Xu, Xiaoxun" uniqKey="Xu X" first="Xiaoxun" last="Xu">Xiaoxun Xu</name><name sortKey="Zhong, Qinmei" sort="Zhong, Qinmei" uniqKey="Zhong Q" first="Qinmei" last="Zhong">Qinmei Zhong</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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