秸秆还田量对土壤团聚体有机碳和玉米产量的影响

被引:124
作者
孟庆英 [1 ,2 ,3 ,4 ]
邹洪涛 [1 ,2 ,3 ]
韩艳玉 [1 ,2 ,3 ]
张春峰 [4 ]
机构
[1] 沈阳农业大学土地与环境学院
[2] 农业部东北耕地保育重点实验室
[3] 土肥资源高效利用国家工程实验室
[4] 黑龙江省农业科学院佳木斯分院
关键词
有机碳; 团聚体; 秸秆还田; 玉米;
D O I
暂无
中图分类号
S513 [玉米(玉蜀黍)]; S152 [土壤物理学];
学科分类号
090104 [作物信息科学与技术]; 090301 [土壤学];
摘要
为明确秸秆深还田对土壤团聚体及有机碳和作物产量的影响,在辽宁省半干旱地区进行了6年秸秆深还田小区定位试验,秸秆施用量分别为0(CK)、6 000 kg/hm2(T1)、12 000 kg/hm2(T2)、18 000 kg/hm2(T3)、24 000 kg/hm2(T4),将秸秆还入>20~40cm土壤亚表层,利用干筛、湿筛得到不同粒级土壤团聚体。结果表明:秸秆添加与CK比可降低土壤0~20 cm和>20~40 cm土层土壤容重;土壤机械性团聚体主要集中在>0.25 mm粒级,而水稳性团聚体主要集中在<0.25mm粒级,与CK处理比秸秆的添加增加了土壤机械稳定性团聚体平均重量直径(MWD)和土壤水稳性团聚体MWD,随秸秆还田量增加,MWD值增大;秸秆深还田使各粒级团聚体有机碳均高于CK,对>20~40 cm土层土壤团聚体碳含量的影响大于0~20 cm土层;秸秆深还田可增加玉米产量,随秸秆还田时间延长,不同秸秆还田量对玉米产量增加存在差异,2016年玉米产量测定结果各处理与CK比,T1增产4.66%、T2增产6.71%,T3增产5.37%、T4增产8.82%。秸秆深还田,能够提升土壤团聚体的稳定性,有利于增加土壤团聚体碳含量,对土壤质量和玉米产量的提高具有促进作用。
引用
收藏
页码:119 / 125
页数:7
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