应用生态学报2015，Vol.26Issue(1)：168-176,9.
长期不同耕作与秸秆还田对土壤养分库容及重金属Cd的影响
Effects of long-term tillage and rice straw returning on soil nutrient pools and Cd concentration
摘要
Abstract
The objective of this study was to assess the effects of tillage and straw returning on soil nutrient and its pools,and soil Cd concentration,and to identify the strategies for rational tillage and remediation of Cd contaminated paddy fields.The experiment was established with no-tillage with straw retention (NTS),rotary tillage with straw incorporation (RTS),conventional plow tillage with straw incorporation (CTS),conventional plow tillage with straw removed (CT) from 2005 to 2013.The results indicated that tillage and rice straw retention had a great impact on soil properties at 0-10 cm soil depth.The soil aeration,and concentrations of soil nutrient and soil Cd increased under CTS,CT,and RTS.Due to the shallow plow layers,soil nutrient pools and the Cd concentration in rice shoot decreased in long-term tilled soil.Under long-term no-tillage,the soil bulk,soil nutrient pools and Cd concentration in rice shoot increased,but concentrations of soil nutrients decreased.In addition,rice straw returning significantly increased the soil nutrient concentrations,cation exchange capacity,depth of plow layer,and soil nutrient pools.However,the Cd in the rice straw was also returned to the soil by rice straw returning,which would not benefit the remediation of soil Cd.Therefore,it is necessary to improve tillage and straw retention practices due to the disadvantages of long-term continuous single tillage method and rice straw returning practices.Some recommended managements (e.g.,rotational tillage or subsoiling,reducing straw returning amount,and rotational straw returning) could be good options in enhancing soil fertility and remedying soil pollution.关键词
耕作方式/秸秆还田/养分库容/Cd/水稻Key words
soil tillage / straw retention/ soil nutrient pool / Cd / rice分类
农业科技引用本文复制引用
汤文光,肖小平,唐海明,张海林,陈阜,陈中督,薛建福,杨光立..长期不同耕作与秸秆还田对土壤养分库容及重金属Cd的影响[J].应用生态学报,2015,26(1):168-176,9.基金项目
国家科技支撑计划项目(2013BAD07B11,2012BAD20B05)和国家公益性行业(农业)科研专项(201103001,201203031)资助. （2013BAD07B11,2012BAD20B05）
