【作者】 薛斌； 刘威； 殷志遥； 肖琼； 张惠华； 刘胤池； 徐晓萌； 董祥伟； 鲁剑巍； 李小坤； 黄丽；

【Author】 Xue Bin;Liu Wei;Yin Zhiyao;Xiao Qiong;Zhang Huihua;Liu Yinchi;Xu Xiaomeng;DongXiangwei;Lu Jianwei;Li Xiaokun;Huang Li;Key Laboratory of Arable Land Conservation Middle and Lower Reaches of Yangtze River,Ministry of Agriculture,Huazhong Agricultural University;

【机构】 华中农业大学农业部长江中下游耕地保育重点实验室；

【摘要】 在湖北省武穴市和荆州市两个水旱轮作长期定位实验的基础上,研究秸秆还田对农田土壤水稳性团聚体组成(> 5 mm、2～5 mm、1～2 mm、0.5～1 mm、0.25～0.5mm、0.053～0.25 mm和<0.053 mm)及其腐殖质组分中有机碳含量的影响。结果表明:两地各处理中团聚体的组成有差异,武穴秸秆还田(W1)和秸秆还田(W2)处理的优势级别团聚体都为0.053～0.25 mm,含量分别为36.75%和33.53%,荆州市未秸秆还田(J1)和秸秆还田(J2)处理的优势级别团聚体为>5 mm团聚体,含量分别为59.72%和68.90%;与W1和J1相比较,秸秆还田W2和J2处理后水稳性大团聚体(>0.25 mm)含量增加了7.33%和12.82%;秸秆还田能够增加土壤及其团聚体中的有机碳,武穴土壤中有机碳增加了12.35%,>5 mm、2～5 mm和1～2 mm团聚体中分别增加了10.59%、5.38%和2.58%,荆州土壤中有机碳增加了16.93%,0.5～1 mm团聚体中增幅最大,为22.43%;秸秆还田增加了两地土壤腐殖酸(HE)碳的含量,增幅大约为20%,但对各粒径中腐殖酸碳含量影响不同,胡敏酸(HA)和富里酸(FA)碳含量的规律不明显;武穴秸秆还田降低了土壤及小直径团聚体(0.5～1 mm,0.25～0.5 mm,0.053～0.25mm,<0.053 mm)的HA/FA,而其大直径的团聚体(>5 mm、2～5 mm,1～2 mm)中的增加,但荆州土壤秸秆还田之后各级别团聚体中HA/FA都有不同程度的增加。更多还原

【Abstract】 Two long-term experiment was conducted based on the paddy-upland rotation at Jingzhou and Wuxue City of Hubei Province,to study the effects of straw returning on soil water stable aggregates and organic carbon in humus fractions.The results showed that no straw returning(W1) and straw returning(W2) treatments were dominant in aggregate size of 0.053～0.25 mm,contents were 36.75% and33.53% in Wuxue city.However,no straw returning(J1) and straw returning(J2) treatments were dominant in aggregate size of> 5 mm,aggregate contents were separately 59.72% and 68.90% in Jingzhou City.Water stable macroaggregates(>0.25 mm) of J2 and W2 treatments were increased by 7.33% and12.82%respectively as compared to W1 and J1.Straw returning increased soil aggregates organic carbon by12.35%,>5 mm,2～5 mm and 1～2 mm size of the aggregates increased by 10.59%,5.38% and2.58%,respectively in Wuxue city.While in Jingzhou,soil organic carbon increased by 16.93%,in which 0.5～1 mm size aggregates were highest increased by 22.43%.Straw returning increased about 20%of two soil carbon contents in humus acid,but the effects were different for each particles,and the carbon content of humic acid and fulvic acid were not obvious.Straw returning reduces HA/FA of soil and small particle size aggregates(0.5～1 mm,0.25～0.5 mm,0.053～0.25 mm,<0.053 mm),and increased it of large particle size aggregates(>5 mm,2～5 mm;1～2 mm) in Wuxue city,however,soil straw affected HA/FA of various soil aggregates in different degrees in Jingzhou city.更多还原