CAJ | 학술논문

为探讨黄土丘陵区小流域土地覆被变化特征及其对流域径流产沙量的影响,以黄土丘陵区吕二沟、罗玉沟及其嵌套流域(桥子沟)等3个小流域为研究对象,运用数理统计学、配对流域等方法定量分析了3个小流域不同研究时段内土地覆被变化对径流产沙量的影响.结果表明,1982~2004年间,林地面积以1.07%/a 的速率快速递增是吕二沟流域土地覆被变化的最明显特征,而罗玉沟流域在国家坡改梯工程影响下,坡耕地面积大幅减少,1986~1995年间约73%坡耕地转化为梯田；结合配对流域法可知,土地覆被变化是导致流域径流和产沙减少的主要原因,在相同降雨条件下,径流深、泥沙量分别减少43.76%和35.23%.流域年径流模数与年降水量和流域森林覆被率均呈指数关系,流域森林覆被率增加5%,径流模数可减少18.43%~37.58%.
위탐토황토구릉구소류역토지복피변화특정급기대류역경유산사량적영향,이황토구릉구려이구、라옥구급기감투류역(교자구)등3개소류역위연구대상,운용수리통계학、배대류역등방법정량분석료3개소류역불동연구시단내토지복피변화대경유산사량적영향.결과표명,1982~2004년간,임지면적이1.07%/a 적속솔쾌속체증시려이구류역토지복피변화적최명현특정,이라옥구류역재국가파개제공정영향하,파경지면적대폭감소,1986~1995년간약73%파경지전화위제전；결합배대류역법가지,토지복피변화시도치류역경류화산사감소적주요원인,재상동강우조건하,경류심、니사량분별감소43.76%화35.23%.류역년경류모수여년강수량화류역삼림복피솔균정지수관계,류역삼림복피솔증가5%,경류모수가감소18.43%~37.58%.
To explore the impacts of land cover change on runoff and sediment yield in Loess Hilly-gully region, Lvergou watershed, Luoyugou watershed and her son basins of Qiaozigou in the study region were selected as the research objects. Mathematical statistics method and paired catchments approach were applied to analyze the effect of land cover change on runoff and sediment yield. Brief conclusions can be drawn as follows: The rapid increase of forest land at the rate of 1.07% per year was the most obvious features of the land cover changes in Lvergou watershed during the period of 1982-2004. Moreover, under the influence of terracing sloping fields, about 73%of sloping farmland was converted to terraces in Luoyugou watershed during the period of 1986-2004. Combined with the paired catchments approach, land cover change was the strongest contributor to the reduction in annual runoff and sediment yield of watersheds, and the average reduction rate reached 43.76% and 35.23% under the same rainfall condition, respectively. Annual runoff modulus and precipitation and forest cover rate were significantly correlated, and showed an exponential relationship for each watershed during the study period. When the forest cover rate increased by 5%, the runoff modulus decreased by 18.43%to 37.58%.