摘要
为合理确定干旱风沙区水库周边防护林带有效宽度,以金塔县解放村水库为研究对象,用袋式SCC-X多通道风蚀测量仪对防护林带内不同高度及不同林带宽度的输沙量进行监测,分析了不同林带宽度的减蚀率和边际效益。结果表明:干旱风沙区水库防护林带内输沙量随距地面高度的增加而减小,以离地面20 cm以下为主,其占100 cm以下输沙总量的比例为41.49%~62.23%;林带内离地面80 cm以下的输沙量占100 cm以下输沙总量的90%左右,因此应选择低矮、抗旱的灌木树种建植固沙林带,以降低防护林灌溉耗水量和管理费用;沙源前沿防护林为灌木幼林的情况下,当林带宽度在233~365 m之间时减蚀率指标最大,当林带宽度为234 m时阻沙边际效益最大,解放村水库经济合理的灌木防护林带宽度以240 m左右为宜。
In order to reasonably determine the effective width of the shelterbelt around the reservoir in the arid sandstorm area,the Jiefangcun Reservoir in Jinta County was taken as the research object,and the sediment transport in the shelterbelt with different heights and different forest belt widths were monitored with the bagtype SCCX multichannel wind erosion measuring instrument and the erosion reduction rate and the marginal benefit of different forest belt widths were analyzed.The results show that the sediment transport volume in the reservoir shelterbelt in the arid sandstorm area is decreased with the increase of the height from the ground and the sediment transport volume is mainly below 20 centimeters above the ground,accounting for 41.49%-62.23%of the total sediment transport volume below100 centimeters.The sediment transport amount below 80 centimeters above the ground in the forest belt accounts for about 90%of the total sediment transport amount below 100 centimeters.Therefore,lowgrowing and droughtresistant shrub species should be selected to build and plant the sandfixation forest belt so as to reduce the water consumption and management costs of shelter forest irrigation.In the case that the sand source frontier protection forest is a young shrub forest,the erosion reduction rate index is the largest when the width of the forest belt is between 233 meters and 365 meters and the marginal benefit of sand resistance is the largest when the width of the forest belt is 234 meters.Therefore,the economic and reasonable width of the shrub protection forest belt in Jiefangcun Reservoir should be about 240 meters.
作者
周建海
张晓虹
何有华
孙浩峰
徐裕
ZHOU Jianhai;ZHANG Xiaohong;HE Youhua;SUN Haofeng;XU Yu(Research Institute of Water and Soil Conservation of Gansu Province,Lanzhou 730020,China)
出处
《人民黄河》
CAS
北大核心
2020年第8期100-103,共4页
Yellow River
基金
甘肃省科技计划重点项目(17YF1FA112)
甘肃省水利重点科研项目(甘水建管发[2019]69号-06)。
关键词
干旱风沙区
平原型水库
防护林带
减蚀率
边际效益
arid sandstorm area
plain type reservoir
forest shelter belts
decrease the corrosion rate
marginal benefit
