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长期秸秆还田对剖面土壤肥力质量的影响 预览 被引量:47

Effect of long-term application of straw on soil fertility
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摘要 从20世纪80年代开始,分别在江苏省常熟和江西省进贤布置长期定位试验,研究秸秆还田对乌栅土及红壤性水稻土土壤肥力的空间变异特征影响。结果表明:无论是乌栅土还是红壤性水稻土,秸秆与化肥配合施用下,土壤有机质、全氮、全钾含量及阳离子交换量均随土层深度增加而降低,其含量明显高于单施化肥或不施肥处理(对照)。秸秆与化肥配合施用能够促进作物对土壤磷素的吸收和提高磷素利用效率;增加土壤腐殖质含量,改善腐殖质品质。腐殖物质组分碳含量与土壤肥力水平呈显著正相关。红壤性水稻土长期施秸秆可能增加腐殖质的下移。总之,秸秆与化肥配合施用能够明显提高乌栅土和红壤水稻土肥力水平,从而确保了该妯区士地资源的可持续利用和农民增产增收。 Field experiments since the 1980s were conducted to study the effect of extensive application of straw on soil fertility in Wushan soil in Changshu, Jiangsu Province, and in Red paddy soil in Jinxian, Jiangxi Province. Results show that soil organic matter content, total nitrogen, total potassium as well as CEC of both the Wushan soil and Red paddy soil decrease with increasing soil depth of profile under combined chemical fertilizer and straw application, which are significantly higher than under non-straw treatments. Combined application of chemical fertilizer and straw increases crop phosphorus absorption, phosphorus utilization rate and humic acid content, hence improving soil humic acid availability. Soil humic acid significantly influences soil fertility. In Red paddy soils, long-term application of straw may lead to humic acid leakage. Therefore combined application of chemical fertilizer and straw increases soil fertility and ensures land resource sustainability and high yield.
作者 孙星 刘勤 王德建 张斌 SUN Xing, LIU Qin , WANG De-Jian , ZHANG Bin (1. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
出处 《中国生态农业学报》 CAS 2008年第3期 587-592,共6页 Chinese Journal of Eco-Agriculture
基金 国家重点基础研究(973)发展计划项目(2005CB121107)和中国科学院知识创新工程(KZCX3-SW-435)资助
关键词 长期秸秆还田 土壤肥力 空间变异 腐殖质 Long-term straw application, Soil fertility, Spatial variation, Humic acid
作者简介 孙星(1978~),女,硕士研究生,助理农艺师,主要从事农田生态系统养分循环研究。E—mail:sunx@mail.issas.ac.cn 通讯作者,E—mail:qliu@issas.ac.cn
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