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Storage, Patterns and Controls of Soil Nitrogen in China
- Source :
- Pedosphere. 17:776-785
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- Soil holds the largest nitrogen (N) pool in terrestrial ecosystems, but estimates of soil N stock remain controversial. Storage and spatial distribution of soil N in China were estimated and the relationships between soil N density and environmental factors were explored using data from China's Second National Soil Survey and field investigation in northwest China and the Tibetan Plateau. China's soil N storage at a depth of one meter was estimated at 7.4 Pg, with an average density of 0.84 kg m−2. Soil N density appeared to be high in southwest and northeast China and low in the middle areas of the country. Soil N density increased from the arid to semi-arid zone in northern China, and decreased from cold-temperate to tropical zone in the eastern part of the country. An analysis of general linear model suggested that climate and vegetation determined the spatial pattern of soil N density for natural vegetation, which explained 75.4% of the total variance.
Details
- ISSN :
- 10020160
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- Pedosphere
- Accession number :
- edsair.doi...........4b95c68d0256ef6239911cc4595d61a9
- Full Text :
- https://doi.org/10.1016/s1002-0160(07)60093-9