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基于黄土丘陵沟壑区安塞试验站小区实验研究,探讨了坡面尺度土地利用格局变化对径流的影响。根据2006年10次降雨的径流数据,对全谷子(a),2/3谷子—1/3柳枝稷(ab),2/3谷子—1/3撂荒地(ac),2/3谷子—1/3苜蓿(ad)4种土地利用格局进行了分析。研究结果表明,(1)径流量的月分布特征与降雨量的月分布基本一致,高降雨量导致高产流量;(2)同一坡度条件下,格局ab,ac,ad与格局a相比均有不同程度的减流效应,减流效应的顺序为:ab>ac>ad;(3)随着坡度从10°增加到25°,格局a,ab,ad的径流量逐渐增大,格局ac的径流量则是呈现一个先增大后减少的趋势;(4)由于受植被盖度、降雨以及人为干扰的复合作用,不同月份产流量的变化特征与年产流量变化规律不尽一致。
Based on the experimental study of the Ansai Experimental Station in loess hilly and gully regions, the effect of land use pattern change on runoff was discussed. According to the run-off data of 10 rainfalls in 2006, the effects of whole-grain (a), 2/3 millet -1/3 switchgrass (ab), 2/3 millet- 1/3 stubble (ac), 2/3 millet- / 3 alfalfa (ad) four kinds of land use patterns were analyzed. The results show that (1) monthly distribution of runoff is consistent with monthly distribution of rainfall, and high rainfall leads to high yield of flow. (2) Under the same slope, the pattern ab, ac, ad has a (3) As the slope increases from 10 ° to 25 °, the runoff of a, ab and ad increases gradually, and the pattern of ac (4) Due to the compound effect of vegetation coverage, rainfall and man-made disturbance, the variation characteristics of runoff in different months are not consistent with the variation of annual runoff.