哀牢山亚热带常绿阔叶林土壤含水量变化规律及其影响因子  

Temporal variation pattern and its affecting factors of soil water content in a subtropical evergreen broadleaved forest in Ailao Mountains,Southwest China

作　　者：余雷[1,2] 张一平[1,3] 沙丽清[1,3] 宋清海[1,2] 谭正洪[1] 周文君[1,2] 武传胜[1,3,2] 

机构地区：[1]中国科学院热带森林生态学重点实验室(西双版纳热带植物园),昆明650223 [2]中国科学院大学,北京100049 [3]中国科学院哀牢山亚热带森林生态系统研究站,云南景东676209

出　　处：《生态学杂志》2013年第2期332-336,共5页Chinese Journal of Ecology

基　　金：云南省自然科学重点基金项目(2011FA025);国家重点基础研究发展计划项目(2010CB833501);国家自然科学基金项目(31061140359);中国科学院战略性先导科技专项(XDA05050601-01-05);中国科学院知识创新工程重要方向项目(KZCX2-YW-Q1-05-04)资助

摘　　要：利用ChinaFlux设置在哀牢山亚热带常绿阔叶林内的通量观测系统的土壤含水量数据,分析了哀牢山亚热带常绿阔叶林内土壤含水量的时间变化及其影响因子,以期了解哀牢山亚热带常绿阔叶林土壤含水量特征及其变化规律,为森林固碳能力、潜力和速率研究提供支撑。结果表明:(1)哀牢山亚热带常绿阔叶林不同深度土壤含水量大致呈单峰曲线分布,各层土壤含水量基本上随着土壤深度的增加而降低,波动范围也逐渐减小,最小值均在3月,最大值集中在7、8、9三个月。(2)0～100cm各层深度的土壤含水量在17.7%～39.5%波动,其中100cm深度的土壤含水量值最低、波动范围最小,总体来看,土壤含水量雨季高于旱季。(3)土壤含水量主要受降雨量、地温和相对湿度等要素的影响(P<0.05),哀牢山亚热带常绿阔叶林5cm深度的土壤含水量最大,约为38%。Based on the soil water content data from the flux uoservanon System of Chinariux installed in a subtropical evergreen broadleaved forest in the Ailao Mountains, Yunnan Province of Southwest China, the temporal variation and its affecting factors of soil water content in the for- est were analyzed, aimed to further understand the characteristics and the annual variation pattern of the soil water content, and to provide basis to study the carbon sequestration ability, potential, and rate of local forest. In this forest, the soil water content at different depths .more or less pres- ented a single peak curve. With decreasing depth, the soil water content decreased, and its fluc- tuation range also had a gradual decrease, with the minima occurred in March and the maxima in July, August, and September. In the 0-100 cm profile, the soil water content in different layers ranged from 17.7% to 39.5%, with the minima and the least fluctuation at the depth 100 em. Overall, the soil water content was higher in rainy season than in dry season. The soil water con- tent was mainly affected by precipitation, soil temperature, and relative humidity （ P 〈 0.05 ）. The maximum soil water content at the depth 5 cm in the subtropical evergreen broadleaved forest in Ailao Mountains was about 38%.

关 键 词：土壤含水量 亚热带常绿阔叶林 哀牢山 

分 类 号：S714[农业科学—林学]