长白山阔叶红松林不同深度土壤水分特征曲线  

Soil water characteristic curves at different soil depths in a broad-leaved Korean pine forest in Changbai Mountains

作　　者：孙迪[1,2] 夏静芳[3] 关德新[1] 王安志[1] 吴家兵[1] 袁凤辉[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100049 [3]北京林业大学水土保持学院,北京100083

出　　处：《应用生态学报》2010年第6期1405-1409,共5页Chinese Journal of Applied Ecology

基　　金：国家重点基础研究发展规划项目(2009CB421101);中国科学院知识创新工程重要方向项目(KZCX2-YW-Q06-2-1);林业公益性行业科研专项(200804001)资助

摘　　要：采用露点水势仪对长白山阔叶红松林不同深度(0～10cm的壤土、20～30cm的白浆土、50～60cm的黄土)土壤水分特征曲线进行分析.结果表明:不同土层土壤水分特征曲线整体趋势均表现为快速下降-缓慢下降-基本平稳;用Gardner等提出的幂函数方程可较好地反映该区土壤含水量与土壤水势之间的数量关系,拟合方程的相关系数在0.9239～0.9400;不同土层土壤的持水能力大小依次为黄土>壤土>白浆土,土壤含水量随土壤水势降低而减小的速度依次为壤土>白浆土>黄土.不同土层脱湿过程的土壤水分特征曲线位于吸湿过程之下,说明土壤水分存在滞后现象,且滞后时效依次为壤土>黄土>白浆土.The soil water characteristic curves （SWCC） at different soil depths （0-10 cm,loamy; 20-30 cm,side-bleached layer; and 50-60 cm,loess） in a broad-leaved Korean pine forest in Changbai Mountains were measured by dewpoint potential meter. The SWCC at different soil depths showed a trend of fast descending-slow descending-basically stable. The relationship between soil water content and soil water potential could be successfully described by the power function proposed by Gardner et al.,and the correlation coefficient was between 0.9239 and 0.9400. The soil water-holding capacity at different soil depths was in the order of 50-60 cm 0-10 cm 20-30 cm,and the decline rate of soil water content along with the decline of soil water potential at different soil depths was in the order of 0-10 cm 20-30 cm 50-60 cm. The desorption curve was located below the absorption curve. A hysteresis between the absorption process and desorption process was observed,and the hysteresis degree was the highest at the depth 0-10 cm,lower at 50-60 cm,and the lowest at 20-30 cm.

关 键 词：土壤水分特征曲线 土壤水势 脱湿过程 吸湿过程 土壤含水量 

分 类 号：S152.7[农业科学—土壤学]