论文部分内容阅读
通过室内土柱蒸发实验,研究了2种秸秆覆盖位置(0 cm、土面以下20 cm)、4种秸秆覆盖量〔0 kg·hm-2(CK)、6 000 kg·hm-2、12 000 kg·hm-2、18 000 kg·hm-2〕和3种秸秆长度(1 cm、5 cm、10 cm)的秸秆覆盖对土壤水分蒸发的影响。结果表明:表层覆盖秸秆能明显抑制水分蒸发,秸秆量越大,日蒸发强度越小,不同秸秆覆盖量处理间累积蒸发量差异显著;秸秆长度对日蒸发强度影响不明显,秸秆覆盖量在18 000 kg·hm-2时,不同秸秆长度累积蒸发量差异显著。土面以下20 cm处秸秆覆盖处理的日蒸发强度在蒸发前期均高于表层覆盖和CK处理,蒸发后期小于表层覆盖和CK处理;秸秆长度为1 cm和10 cm时,不同秸秆覆盖量累积蒸发量差异显著,秸秆覆盖量12 000 kg·hm-2和18 000 kg·hm-2时,不同秸秆长度累积蒸发量差异显著。方差分析表明:秸秆覆盖量对表层覆盖累积蒸发量的贡献最大,秸秆长度对土面以下20 cm处覆盖累积蒸发量效果显著。
Through indoor soil column evaporation experiment, the effects of two straw mulching positions (0 cm, 20 cm below soil surface), four kinds of straw mulching amount (0 kg · hm-2 (CK), 6 000 kg · hm-2,12 000 kg · hm-2, 18 000 kg · hm-2〕 and three kinds of straw length (1 cm, 5 cm and 10 cm) on soil water evaporation. The results showed that straw covered by straw could significantly inhibit water evaporation. The larger the amount of straw was, the lower the evaporation intensity was. The difference of cumulative evaporation between different straw mulching treatments was notable. 000 kg · hm-2, the cumulative evaporation of different length of straw significant difference. The daily evapotranspiration of straw mulching at 20 cm below soil surface was higher than that of surface mulching and CK treatment at the early evaporation stage and less than the surface mulching and CK treatment at the late evaporation stage. When the straw length was 1 cm and 10 cm, the cumulative evaporation of different straw mulch There was significant difference in the amount of cumulative evaporation of different straw length when the straw mulching amount was 12 000 kg · hm-2 and 18 000 kg · hm-2. Analysis of variance showed that the amount of straw mulch had the greatest contribution to the cumulative evaporation of surface cover, and the effect of straw length on cumulative evapotranspiration at 20 cm below soil surface was significant.