期刊论文

Chang, Q.(changqr@nwsuaf.edu.cn)

中文

农业工程学报

1002-6819

2013

29

2

132-140

10.3969/j.issn.1002-6819.2013.02.019

国家自然科学基金项目（30872073） 国家重点基础研究发展计划（973项目）（2007CB407203） 陕西省耕地地力评价项目

本校为其他机构

为充分了解关中农业区土壤肥力状况,该文以西安市郊区的长安区、户县和周至县为例,综合运用地统计学和 GIS 技术,分析西安市郊区耕层土壤有机质空间特征与变化.结果表明,当前研究区土壤有机质质量分数介于5.80-34.90 g/kg,平均15.95 g/kg,空间上呈西北低东南高格局.在约450 m 的采样尺度下,具有中等强度的空间相关性,空间变异性是由地形地貌、土壤质地等结构性因素和施肥、种植制度等人为因素共同作用的.2009年耕地中有机质质量分数6.42%适宜,93.46%偏低,0.12%缺乏,整体水平偏低.按西安市第二次土壤普查有机质分级标准,1983-2009年,81.75%的耕地有机质含量明显提升,2.20%出现不同程度的下降.农户...

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