半干旱黄土丘陵区植物休眠期覆盖对土壤水热变化的影响

发布时间：2018-02-10 23:34

本文关键词： 植物休眠期含水量温度典型覆盖半干旱黄土丘陵区　出处：《水土保持学报》2017年03期 　论文类型：期刊论文

【摘要】：通过对半干旱黄土丘陵区植物休眠期内不同地膜覆盖下土壤水分与温度的野外试验观测,研究覆膜下土壤水分运移规律与温度变化差异。于2014年10月—2015年4月在西北农林科技大学米脂试验站远志山同一水平阶地上,观测裸地(CK)与透明薄膜覆盖(TF)2种处理下0—400cm深度内土壤水分与裸地(CK)与透明薄膜覆盖(TF)、黑色薄膜覆盖(BF)3种处理下0—50cm(15,30,50cm)深度内土壤温度。结果表明:在植物休眠期,0—400cm土壤储水量TF较CK高51.9%,差异显著(p0.05);0—20cm土壤储水量变幅最大,20—60cm的土壤储水量由上层54.9%降至26.3%;在典型晴天,非冻结阶段CK、TF与BF处理最值温差区间为2.25~2.7℃,3.45~3.5℃,1.5~1.8℃,而在冻结阶段为1.65,2.1,1.2℃,土壤冻结时覆膜保温效应不显著;覆膜保温深度可达15cm,BF处理保温效果优于TF处理。总体来看,在植物休眠期覆膜可以提高0—20cm深度范围的土壤含水量和土壤温度,减少土壤水分损失并促进水分向深层入渗,BF处理较TF处理更加有利于增温与稳定温度变化。
[Abstract]:The plants in the Semiarid Loess Hilly Region dormancy field experimental observation period of different film mulching under soil moisture and temperature, the difference of soil moisture migration laws and temperature change of film. From October 2014 to April 2015 at the Northwest Agriculture and Forestry University experimental station with a level of polygalacic Mizhi terrace, bare land observation (CK) and the transparent film covering (TF) 2 under treatment of 0 400cm depth of soil moisture and soil (CK) and transparent mulch (TF), black mulch (BF) 3 treatment 0 - 50cm (15,30,50cm) soil temperature within the depth. The results showed that the dormancy in plants, 0 400cm soil water TF is higher than that of CK 51.9%. The difference was significant (P0.05); 0 20cm soil water storage was the largest, soil water storage of 20 60cm from the top 54.9% to 26.3%; in a typical day, non freezing stage CK, TF and BF the value of temperature range of 2.25~2.7 DEG C, 3.45~3.5 C, 1.5~1.8 C, while in the freezing stage is 1.65,2.1,1.2 Deg. C, soil freezing film insulation effect; thermal insulation film depth can reach 15cm, BF insulation effect is better than that of TF. Overall, the film can improve the plant dormancy of 0 - 20cm depth range of soil water content and soil temperature, soil moisture and reduce losses to promote water deep infiltration, BF treatment compared with TF treatment is more beneficial to increasing temperature and stable temperature.

【作者单位】：甘肃农业大学林学院;甘肃民族师范学院物理与水电工程系;中国科学院教育部水土保持与生态环境研究中心;西北农林科技大学水利与建筑工程学院;
【基金】：国家林业公益项目“山地红枣生态经济林增效关键技术研究与示范”(201404709) 国家支撑计划项目“陕北水蚀区植被功能调控技术与示范”(2015BAC01B03) 陕西统筹项目“红枣优质高效生产关键技术集成与示范”(2014KTCG01-03)
【分类号】：S152

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