摘要
本文对陕北半干旱黄土丘陵沟壑区内的鱼鳞坑、水平沟、反坡梯田3种主要造林整地工程的集流与蓄水能力进行了测定和分析,结果表明:造林整地工程是提高栽植穴土壤水分的有效措施。年均集水量与集流面积及降雨量成正比,集水面积1.5m^2为29.22kg;2.0m^2为33.95kg;2.5m^2为37.58kg;平均蓄水量,以反坡梯田最高,为26.5mm;水平沟次之,为24.8mm;鱼鳞坑较差,为20.7mm。并提出了3种造林整地工程单场降雨集流预测模型。
Collecting and storage water by land preparation engineerings was analyzed in accordance with principle of water equilibrum and Inw of runoff movement. Results show that land preparation engineerings is an available measure, which can adjust soil moisture of pits for planting tree. The average collected water by the engineerigs is correlated positively with collecting water area and precipitation which causes runoff. If collecting water area is 1.5m2, 2.0m2 and 2.5m2, its collected water is 29.22kg, 33.95kg and 37.58kg respectively. Among three engineerings, the average annual storage water of the reverse-slope terrace is the highest, up to 26.5mm, that of the contour trench is 24.8mm that of fish-scale pit is the lowest, only 20.7mm. Rainfall plays a dominant part for soil storage water. Prediction model of collecting water by the land preparation engineerings in individual rainfalls can be used extensively in practise.
出处
《西北林学院学报》
CSCD
1992年第2期45-49,共5页
Journal of Northwest Forestry University
基金
"七.五"国家重点科技攻关专题研究内容之一
关键词
半干旱区
造林整地工程
预测模型
semi-arid loess
hill and gully area
land preparation engineering
collecting water from runoff
prediction model
