黄土丘陵区不同林地土壤水分动态变化

研究黄土丘陵区不同林地的土壤水分变化，对于改善黄土高原生态环境建设有着重要的意义。采用定点监测的方法，对陕西省吴起县不同林地土壤水分动态变化进行了研究。结果表明:不同林地在生长季中土壤蓄水量具有显著差异，其顺序为:沙棘林>河北杨林>油松林>山杏林；林地的土壤蓄水量变化具有明显的季节性，根据生长季内土壤蓄水量的变化，可以将土壤水分变化分为3个时期:土壤水分恢复期、土壤水分消耗期、土壤水分补充期；各林地0-200 cm土层土壤水分变异系数从小到大为:山杏林>河北杨林>沙棘林>油松林；在雨水入渗、蒸发、蒸散的共同作用下山杏林地在0-60 cm土层含水量的变化明显大于其它林地。研究结果揭示了不同林种对土壤水分消耗和补给的影响，为当地造林结构配置和植被恢复与重建工作提供一定参考依据。

Dynamics of Soil Water Content under Different Forestland in the Loess Hilly Region

Soil water content is crucial to vegetation rehabilitation on the hilly loess plateau.Using fixed-point dynamic monitoring methods,dynamics of soil water content under different forest were studied in forest or grass lands converted from farmlands in loess hilly region.Results showed that different forestland has a significant differences on soil water storage capacity in the growing season,in terms of soil water,forest species may be ranked in the descendant order of sea buckthorn,hebei poplar,Chinese pine...