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贡嘎山暗针叶林生态系统土壤斥水性分析

发表时间:2010-09-30  浏览量:1299  下载量:438
全部作者: 牛健植,邵文伟,余新晓,赵玉涛,张志强,王庆龙
作者单位: 北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室;国营伊通满族自治县黄岭子林场
摘 要: 综合地被物层野外调查及组装土柱试验分析,在长江上游暗针叶林生态系统开展土壤斥水性研究。研究基于地被物层的蓄积量、持水性质可知:研究区域不同演替阶段的苔藓层及枯落物层的干蓄积量都较大,且持水性较强,促进土壤斥水性发生;基于土柱试验获取的土壤含水量值可知:在土壤水分含量还没有达到田间持水量时,就已经补给地下水,反映出研究区域土壤水分运移的快速特性及土壤的斥水性质;研究利用经验水滴渗透时间(water droplet penetration time,WDPT)测定法可知:在降雨过程初期,4个不同演替阶段林地土壤各层的表面持水时间均远远超过5 s,可感观判断分析出研究区域的土壤是具有斥水性的土壤类型。
关 键 词: 水土保持与荒漠化防治;土壤斥水性;优先流;枯落物层;土壤含水量;水滴渗透时间测试
Title: Soil water repellency in the dark coniferous forest ecosystem of Gongga Mountain
Author: NIU Jianzhi, SHAO Wenwei, YU Xinxiao, ZHAO Yutao, ZHANG Zhiqiang, WANG Qinglong
Organization: Key Laboratory of Soil and Water Conservation & Desertification Combating of Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University; State Operated Huanglingzi Forestry Farm of Yitong Manchu Autonomous Region
Abstract: The paper develops a study on soil water repellency in dark coniferous forest ecosystem along the upper reach of Yangtze River through a combination of field investigation of litter and moss and soil column experiment. According to the stock volume and moisture retention ability of litter and moss, the litter and moss within the research field across different development stages have big stock volume and high moisture retention ability, which increases the possibility of soil water repellency. At the same time, the water containing value gained during soil column experiment shows that soil water has penetrated into groundwater even before it satisfies the field water-holding capacity. As a result, the study displays that the soil within research field is featured by rapid soil moisture transport and soil water repellency. Also, by using water droplet penetration time (WDPT) test, it shows that the surface water-holding time is largely over five seconds among different soil levels across four development stages in the beginning of rainfall, which proves that the soil within the research filed is characterized by soil water repellency.
Key words: soil and water conservation and desertification combating; soil water repellency; preferential flow; litter layer; soil moisture; water droplet penetration time test
发表期数: 2010年9月第18期
引用格式: 牛健植,邵文伟,余新晓,等. 贡嘎山暗针叶林生态系统土壤斥水性分析[J]. 中国科技论文在线精品论文,2010,3(18):1912-1918.
 
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