黄麻土工布覆盖对土壤温湿度的影响  

The Effects of Geojute on Soil Temperature and Moisture

作　　者：胡立勇[1] 丁树文[1] 李京[1] 

机构地区：[1]华中农业大学农学系,武汉430070

出　　处：《华中农业大学学报》2001年第5期444-448,共5页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金资助项目 ;编号 499710 5 4

摘　　要：坡面覆盖黄麻土工布减缓了炎热及冷凉季节的土壤温度的日较差 ,气温变化差异越大 ,盖布所表现的缓和变温的效应便越强。观察 5cm土壤 ,在 4月至 8月早晨 8:0 0 ,盖布使月均温降低 0 .16～ 1.2 9℃ ;9～ 3月则高于光板地 0 .16～ 0 .84℃ ;在中午 14 :0 0 ,盖布小区的土温均低于光板地 ,降温幅度为 0 .35～ 4 .0 7℃。盖布在缩小不同季节最高与最低温度变幅的同时 ,也减少土壤中高于 30℃与低于 5℃的天数和累积量。不同土壤深度的月均土温曲线 ,光板地多为S型 ,盖布处理有弧型。使用 2a后黄麻土工布降解明显 ,但降解物与土壤结合 ,仍具有较强的调节土温效应。盖布的表层土壤一般比对照提高土壤相对含水量 1%～ 4 % ,夏季最高达 4 .5 %。在土壤含水量 5 %～ 6 %时 ,盖布可使 5～ 10cm土层的相对含水量高于光板地 0 .7% ,在 2 0cm土层则高于光板地2 .8%。盖布改变了土壤孔隙结构 ,土壤入渗速率比光板地高 12 .5 %。Studies showed that geojute covered in 5～20cm soil layer at 8:00 am in the period from September to March of next year had certain effects on raising the soil temperature compared with bare land. The maximum value of the raised temperature could reach 1.10℃ in October while geojute had an obvious effect on reducing of soil temperature in July and August. At 14:00 pm from April to September geojuts could reduce the temperature of the soil layer with 5～20 cm by 3.19 ℃ compare to bare land. The significant discovery was that geojute could cut down the duration and accumulation quantity of the temperature higher than 30℃ and lower than 5℃, which had an inhibitory effect on all plant. Geojute raised water containing quantity by 1.0%～4.5%

关 键 词：黄麻土工布 土壤温度 土壤湿度 水土保持 

分 类 号：S157.9[农业科学—土壤学]