秸秆不同还田方式对土壤低吸力段持水能力及蒸发特性的影响

被引:25
作者
王珍 [1 ]
冯浩 [2 ]
吴淑芳 [1 ]
机构
[1] 西北农林科技大学水利与建筑工程学院
[2] 不详
关键词
秸秆粉碎; 秸秆氨化; 氢氧化铁; 持水能力; 脱水速度;
D O I
暂无
中图分类号
S152.7 [土壤水分];
学科分类号
摘要
利用张力计测定蒸发过程中低吸力段土壤水分特征曲线,对比研究了秸秆在经过粉碎、氨化及与无机土壤改良剂混合三种措施处理后对土壤饱和含水量、低吸力段土壤持水及供水能力和早期干旱过程中土壤脱水速度的影响。结果显示:粉碎秸秆施入土壤后提高了土壤饱和含水量、持水及供水能力,而长秸秆对土壤饱和含水量、持水及供水能力的影响较小;粉碎并氨化的秸秆对土壤饱和含水量、持水及供水能力的提高作用更为显著。粉碎秸秆及长秸秆处理均易造成早期干旱过程中脱水速度过快,氨化后或当秸秆与无机土壤改良剂混合施入土壤时,土壤低吸力段脱水速度明显减慢,利于土壤有效水的保存。该结果为提出新的能最大效率发挥秸秆改良土壤作用的秸秆还田方式提供了一定的理论基础。
引用
收藏
页码:533 / 539
页数:7
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