Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 563, Issue -, Pages 10-18Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.04.111
Keywords
Total nitrogen; Available nitrogen; Hilly region; Multiscale; General linear model; Affecting factor
Categories
Funding
- Projects of Sci-tech Support, Sichuan, China [2014NZ0044]
- Projects of National Sci-tech Support, China [2012BAD14B18-2]
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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. (c) 2016 Elsevier B.V. All rights reserved.
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