半干旱黄土区典型林地土壤水分消耗与补给动态研究

通过对半干旱黄土丘陵沟壑区几种典型林地生长季土壤水分进行动态监测,研究不同林种对土壤水分消耗和补给的影响。结果显示,土壤总含水率大小依次为草地、沙棘、河北杨、油松、山杏,并且这一次序主要来源于120 cm深度(相对稳定层)以下的差异;不同林地及草地土壤含水率季节变化表现基本一致,3—8月波动下降,8—10月持续上升;各林地及草地土壤水分在0~60 cm内变化活跃,60~120 cm内由上至下逐渐趋于稳定,120~200 cm内保持相对稳定;林种、土壤深度、月份3种因素单独作用和交互作用均造成土壤水分差异显著;水分补给期后各林地土壤水分仍处于一定亏缺状态。

Soil Water Consumption and Supply of Typical Forest Lands in the Semiarid Loess Region

In order to investigate the effect to the soil water consumption and supply which is influenced by different forest species and monitor the soil water in different growing season in several typical forest land of loess hilly and gully region.The result shows that the order of soil total water content is grassland,sea buckthorn,hebei poplar,chinese pine,prunus armeniaca,and the difference mainly due to the soil water content of 120 cm which is commonly thought the relative stable layer;These forest lands is identical with the grassland in the seasonal variation of soil water content,the volatility decreased from 3 to 8 months and increased continually from 8 to 10 months;The soil water content of these forest lands and grassland change greatly from 0 to 60 cm,tend to become stable from 60 to 120 cm and become stable from 120 to 200 cm;The difference of the soil water content is significant whether these factors of forest species,soil depth,month are independent action or interaction effect;After the period of water supply,the soil water content of these forest lands are still in the stage of water deficit.