喀斯特石漠化地区土壤水分运动规律研究  

Research on the water movement regulation in soil in Karst desertification areas

作　　者：张俞[1] 熊康宁[1] 张锦华[2] 

机构地区：[1]贵州师范大学中国南方喀斯特研究院/贵州省喀斯特山地生态环境国家重点实验室培育基地,贵州贵阳550001 [2]贵州省畜牧兽医研究所,贵州贵阳550005

出　　处：《广东农业科学》2014年第16期63-66,共4页Guangdong Agricultural Sciences

基　　金：国家"十二五"科技支撑计划重大项目(2011BAC09B01);贵州省重大专项([2011]6009);贵州省农业攻关项目(黔科合NY字[2009]3090)

摘　　要：为了更好地认识喀斯特地区土壤水分运动规律,以贵州石漠化地区土壤为研究对象,采用模拟降水法,通过对石漠化地区土壤水分的临界饱和持水量、水分渗漏速率及水分蒸散速率等参量的分析,研究其水分运动规律.结果表明：模拟降水量130～140 mm为渗漏临界点,此时达到饱和田间持水量;145～165mm时,10 min内达到最大下渗速率;超过165 mm后,在前5 min就可达到最大值;而小于临界点时,水分均以蒸散方式损失,以平均0.00001122 g/s的速度减少.此研究发现了喀斯特石漠化地区土壤水分运动的基本规律,并提供了相关的基础数据,对今后的进一步研究以及喀斯特生态系统的保护具有重要意义.For a better understanding of the water movement regulation of soil in Karst areas, this paper took the soil of the desertification area in Guizhou as research subject, analgzed the critical saturated water, water leakage rate and water evapotranspiration rate with the method of simulated precipitation. The results indicated that it reached saturation field capacity when precipitation simulation was 130-140 mm, which was the leakage critical point; while it reached the maximum infiltration rate within 10 min when the precipitation simulation was 145-165 mm; while it reached the maximum in the first 5 minutes when the precipitation exceeded 165 mm and water loss was in the way of evaporation when precipitation was less than the critical point. This study figures out the fundamental rule of soil water movement in Karst desertification area and provides the relevant basic data for future research with the significance of ecosystem protection in Karst area.

关 键 词：喀斯特 水分 运动规律 

分 类 号：S152.72[农业科学—土壤学]