中文摘要：

在西南地区三熟制套作模式下,以常规平作（T）为对照,连续2a进行大田对比试验,研究了垄作（R）、平作＋秸秆覆盖（TS）、垄作＋秸秆覆盖（RS）、平作＋秸秆覆盖＋腐熟剂（TSD）和垄作＋秸秆覆盖＋腐熟剂（RSD）等5种处理对农田耕层土壤养分含量的动态变化的影响。结果表明,与对照T相比,RSD,TSD,RS,TS处理均显著提高了土壤碱解氮、速效磷、速效钾、全氮、全钾含量和pH值。在3-7月份,RSD与TSD处理的土壤碱解氮、速效钾含量比RS与TS处理要高,但在10月份RSD与TSD处理的土壤碱解氮要低于RS和TS。与对照T相比,在不同时期,R处理均在一定程度上提高土壤碱解氮和全氮的含量,其它养分含量无明显差异。试验结果说明了这5种保护性耕作处理均在不同时期很好地调节了土壤养分的供应情况。

英文摘要：

Under the tri-crop intercropping system in the southwest China,taking local traditional farming as CK,the five treatments are ridge（R）,straw mulching（TS）,ridge＋straw mulching（RS）,straw mulching＋decomposing agent（TSD） and ridge＋straw mulching ＋ decomposing agent（RSD）.Continuous 2 years＇ field contrast experiments have been done.Dynamic variety of soil nutrient content under five different conservation tillage models was studied.The result showed： compared with T,RSD,TSD,RS,TS treatments significantly increased the content of AN,AP,AK,TN,TK and pH;compared with RS、TS,RSD and TSD significantly increased the content of AN、AK from March to July,while the contents of AN of RSD and TSD were a little lower than those of RS and TS;compared with T,R increased the content of AN and TN to the extent during any period.This study illustrates that these five conservation tillage models well regulate the supply of soil nutrients during any period.