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Storage, patterns and controls of soil nitrogen in China

作者：

Yuanhe Yang;Wenqi Ma;Anwar Mohammat;Jingyun Fan

单位：

Department of Ecology, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871 (China);Department of Ecology, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871 (China;School of Environment and Urban Study, Peking University Shenzhen Graduate School, Shenzhen 518055 (China)

关键词：

soil n;storage;density;in china;the country;estimate

摘要：

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.

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Storage, patterns and controls of soil nitrogen in China

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