轮作、耕作及行距对麦田土壤温度动态的影响(英文)

被引:4
作者
任图生
Francis J.Larney
Sean M.McGinn
C.Wayne Lindwall
R.César Izaurralde
机构
[1] 中国科学院地理科学与自然资源研究所,AgricultureandAgri-FoodCanada,AgricultureandAgri-FoodCanada,AgricultureandAgri-FoodCanada,JointGlobalChangeResearchInstitute北京,LethbridgeResearchCentre,Lethbridge,Alberta,CanadaTJB,LethbridgeResearchCentr
关键词
土壤温度; 冬小麦; 轮作; 耕作; 行距;
D O I
暂无
中图分类号
S152.8 [土壤温度和热流];
学科分类号
0903 ; 090301 ;
摘要
研究了加拿大南部冬小麦田在轮作、耕作和行距共同作用下的土壤温度动态。田间裂区试验主区为 3个轮作 (冬小麦连作、冬小麦 /油菜轮作和冬小麦 /夏休闲 ) ,副区包括两种耕作技术 (免耕和常规耕作 ) ,小裂区包括两种种植行距 (等行距和大小行 )。结果表明 ,免耕处理下秸秆覆盖有效地降低了冬季土壤的冻结深度。在 1993~ 1994年度 ,连作小麦免耕土壤的 -5℃等温线要比常规耕作浅 2 2 cm。免耕秸秆覆盖的温度效应在冬小麦连作和冬小麦 /油菜两种轮作上比在冬小麦 /夏休闲上更为明显。在冬小麦连作和冬小麦 /油菜轮作下 ,免耕土壤 2 .5 cm的春季温度连续 4个月显著低于常规耕作土壤。1994年 4月 8日 ,免耕和常规耕作农田 2 .5 cm处的温差在冬小麦连作处理上达到 4.1℃。对于冬小麦 /夏休闲处理 ,由于秸秆覆盖量较少 ,耕作措施对土壤温度的影响不太明显。在 1994年春季 ,大小行种植的土壤温度显著高于等行距种植的土壤温度。因此 ,免耕主要通过秸秆覆盖来改变土壤的温度状况。通过轮作、耕作和行距等措施 ,可以在一定程度上实现土壤温度的人为调节
引用
收藏
页码:52 / 60
页数:9
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