甘肃泾川刺槐林地穿透雨对降雨的响应

Responses of Throughfall to Precipitation in Black Locust Plantation at Jingchan of Gansu

利用2011年和2012年生长季甘肃省泾川县中沟小流域刺槐林地的穿透降雨观测资料,对不同地形/断面部位、不同坡向、不同坡位穿透雨的差异进行综合分析,结果显示：研究期间的林外降雨总量为1061.1 mm,穿透雨量占降雨量的百分比为73.0%~85.6%;对于单次降雨,刺槐林地穿透雨量与降雨量之间呈显著的三次多项式关系;地形/断面部位和坡向对穿透雨量的影响差异显著,而坡位的影响差异不显著,表现出流域空间尺度上林地穿透雨量的非均衡性。

Based on the field investigation during the growing season in2011 and2012,the characteristics of precipitation and throughfall in the black locust plantation at different topography（cross sections）,slope directions and slope positions of Zhonggou small watershed located on the Loess Plateau of Jingchuan,Gansu were observed and systematically analyzed. The results indicate that the total precipitation outside the forest is 1061. 1 mm and the average throughfall percentage range is from 73. 01% to 85. 64%. During single rainfall events,with in creasing precipitation depth,the throughfall depth increase in cubic polynomial form. The significant differences of throughfall at different to pography（cross sections）and slope direction are remarkable,while the significant difference at different slope position is not remarkable.These reflect the differences and the non- equilibrium characteristics of throughfall at the small watershed scale.