Wu Qinxiao,Liu Xiangdong,Zhao Hongyan.SOIL FHY SICAL FROPERTIES AND ITS WATER CHARACTERISTICS IN MOUNTAIN POPLAR FOREST LAND[J].Research of Soil and Water Conservation,1991,(02):79-83,95.
山杨林地土壤的物理性质和水分特性
- Title:
- SOIL FHY SICAL FROPERTIES AND ITS WATER CHARACTERISTICS IN MOUNTAIN POPLAR FOREST LAND
- 摘要:
- 本文对陕北黄土丘陵区山杨天然次生林土壤的物理性质和水分特性进行了测定和研究。研究结果表明，土壤剖面紧实度相对均一，比重和容重随土层深度逐渐增大，总孔隙度发育，特别是在上层；林地土壤入渗率比荒山高16.6倍；由于根系的强烈吸水，土壤湿度以7～9月为最低，3～4月最高，并在土层2.3～2.7m间形成一干燥层，含水量7%～9%，表明土壤贮水经常处于亏缺状态；2m土层的年均贮水量360～370mm，相当于降水量的63%～65%；农地地表径流是山杨林地的2.3倍，土壤流失8.8倍，而略高于采伐地，说明对山杨林资源只要实行合理经营利用，可以避免给山区水土保持带来不良影响。
- Abstract:
- The soil physical properties and its water characteristics in Populus davidiana forest stand were determined and studied. The results of the study showed that the compaction in soil profile is relatively homogeneous, the specific gravity and volume weight of soil increase with deepening of soil horizon. General porosity is developed, especially in upper soil layer. The water infiltration rate of soil in the stand is 17.6 times as high as in natural rangeland. Owing to the absorption of water by root system of plants, the soil moisture content reaches minimum in July-September and returns to maximum in March-April, and a drying layer is formed in soil horizon from 2.3m to 2.7m, where the soil moisture is about 7%～9%,showing that the subsoil water-storage is in the state of deficit. The annual water-storage capacity in 2m of soil horizon is 360～370mm, or 63%～65% of annual precipitation. The sur face runoff and soil loss in P.dovidiana stand are decreased by 2.3 times and 8.8 times respectively over that in farmland, but are a little more than ones in cut-over land. Thus, so long as the rational management and utilization of P.davidiana forest resources are put into practice,the adverse effects to soil and water conservation in hilly region can be averted.
参考文献/References:
[1] 朱显谟.《黄土高原土壤与农业》, 农业出版社, 1989
[2] 宁夏林业厅自然保护区办公室、宁夏六盘山自然保护区管理处.《六盘山自然保护区科学考察》, 宁夏人民出版社, 1988
[3] 中国科学院西北水土保持研究所.《黄土高原杏子河流域自然资源与水土保持》, 陕西科学技术山版社, 1986
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