摘要
森林是陆地上重要的生态系统类型,虽然喀斯特森林的面积相对较小,但其土壤的涵养水源功能对喀斯特地区水土保持和生态恢复仍具有重要意义。研究以贵州典型喀斯特林地为例,采用野外定点采样结合室内实验的方法,对不同林型下土壤的物理特性和持水特征进行分析。结果表明,喀斯特林地内土壤容重随着土层深度的增加而增大,而土壤的孔隙度随着土层深度的增加而减小。同为石灰土情况下,土壤容重的均值大小为针叶林>阔叶林>混交林,有效持水量的大小为阔叶林>混交林>针叶林。黄壤针叶林土壤容重小于石灰土针叶林,两种林型土壤孔隙度差异不明显。除毛管持水量外,其它持水能力指标黄壤针叶林均略大于石灰土针叶林。喀斯特林地土壤饱和的含水量很大程度取决于土壤容重,毛管孔隙度对饱和的含水量的影响并不显著。
Forest is an important type of ecosystem on land. Although the area of karst forest is relatively small, its soil water holding function is still important for soil and water conservation and ecological restoration in karst area. Taking the typical karst forest land in Guizhou as an example, the physical charac- teristics and water holding characteristics of soil under different forest types were analyzed by field sam- piing and laboratory experiment. The results show that the soil bulk density increases with the increase of the soil depth, while the soil porosity decreases with the increase of the soil depth. In the case of limestone soil, the order of the mean value of soil bulk density of different forest types from large to small is coniferous forest 〉 broad-leaved forest 〉 mixed forest, and the order of the effective water holding capacity of different forest types from large to small is broad-leaved forest 〉 mixed forest 〉 coniferous forest. The soil bulk density in coniferous forest growing on yellow soil was lower than that in coniferous forest growing on limestone soil, and the difference of soil porosity in the two forest types was not obvious. Most of the water holding capacity index in coniferous forest growing on yellow soil are slightly larger than that in coniferous forest growing on limestone soil coniferous forest, except the capillary water holding capacity. The maximum water holding capacity of karst forest depends largely on the soil bulk density, and the impact of capillary porosity on the maximum water holding capacity is not significant.
作者
周秋文
尤倩
ZHOU Qiuwen, YOU Qian(School of Geography and Environment Science , Guizhou Normal University, Guiyang 550001, Chin)
出处
《水资源与水工程学报》
CSCD
2017年第6期226-231,共6页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(41761003)
贵州省科学技术基金项目(黔科合J字[2015]2118号)
贵州省本科教学工程建设项目(2016DC3)
贵州师范大学博士科研启动金项目
关键词
森林
土壤
持水性
喀斯特
forest
soil
water holding capacity
Karst
