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Cropland soil organic matter content change in Northeast China, 1985-2005

机译:1985-2005年中国东北农田土壤有机质含量变化

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Soil organic matter (SOM) content is one of themost important indicators of soil quality and hence theproductive capacity of soils. Northeast China (NEC) is themost important region in grain production in China. Inthis study,we assessed the spatiotemporal change of croplandSOM content in NEC using sampling data of 2005 andsurvey data of 1985. We also analysed the driving forcesbehind the SOM content change. Our results showed thatSOM content decreased in 39% of all the cropland in NEC,while increase in SOM content was only detected on 16%of the cropland. SOM remained unchanged in nearly half(i.e. 45%) of the cropland. Our results also revealed thatcropping intensity and fertilizer application were the twomost important factors driving SOM change. Overall, resultsfrom this research provided novel details of the spatiotemporalpatterns of cropland SOM content change inNEC which was not revealed in earlier assessments. Thedatasets presented here can be used not only as baselinesfor the calibration of process-based carbon budget models,but also to identify regional soil quality hotspots andto guide spatial-explicit soil management practices.
机译:土壤有机质含量是土壤质量以及土壤生产力的最重要指标之一。东北(NEC)是中国粮食生产中最重要的地区。本研究利用2005年的抽样数据和1985年的调查数据,对NEC农田SOM含量的时空变化进行了评估。分析了SOM含量变化背后的驱动力。我们的结果表明,NEC在所有农田中的SOM含量下降了39%,而仅在16%的农田中发现了SOM含量的增加。在几乎一半(即45%)的农田中,SOM保持不变。我们的研究结果还表明,耕作强度和施肥量是导致土壤有机质变化的两个最重要因素。总体而言,这项研究的结果提供了NEC中农田SOM含量变化时空格局的新颖细节,早期评估并未揭示这一细节。这里介绍的数据集不仅可以用作基于过程的碳预算模型的校准基准,而且可以用来识别区域土壤质量热点,并指导空间明晰的土壤管理实践。

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