Spatial patterns and effects of soil organic carbon on grain productivity assessment in China

文献类型： 外文期刊

第一作者： Ye, L.

作者： Ye, L.;Verdoodt, A.;Van Ranst, E.;Zhu, J.

作者机构：

关键词： soil organic carbon;grain productivity;land evaluation;China

期刊名称：SOIL USE AND MANAGEMENT （ 影响因子：2.95； 五年影响因子：3.109 ）

ISSN： 0266-0032

年卷期： 2008 年 24 卷 1 期

页码：

收录情况： SCI

摘要： In this paper, we present an assessment of the content and effects of cropland soil organic carbon (SOC) on grain productivity at the national scale in China using a Web-based Land Evaluation System. Homogeneous 5 km x 5 km grid data sets of climate, crop, soil and management parameters were created and grain production in 2005 was simulated. Attempts were made to incorporate SOC into the land evaluation procedure and to quantify the potential effects of SOC deficiency on grain productivity. Results were statistically analysed and the modelling approach was validated. National cropland SOC maps were generated. At the national scale, the cropland SOC content averaged 1.20, 0.58, 0.41, 0.31 and 0.26% for the five 20-cm sections consecutively from the surface downwards. At the regional scale it tended to decline slightly from northeast (1.63%) to southwest (1.11%). On average, 64% of grain yield was lost due to SOC deficiency for the humid provinces and 7% for the and and sub-arid ones. Soil management options are suggested based on the simulation results.

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