黄土高原坡面刺槐林土壤水分有效性分析

Effectiveness of Locusts Soil Moisture in Loess Plateau

通过定位观测并引入土壤水分有效性标准，对黄土高原刺槐林不同地理位置、不同坡向和不同时期土壤储水量进行了分析，结果表明，由南向北，土壤储水量有效性递减，刺槐林0～600cm土壤水分的有效性淳化和延安表现为中效，延安为轻度亏缺；米脂表现为难效，为中度亏缺。在不同坡向间阴坡土壤水分的有效性最高，阳坡最低，半阴坡和半阳坡介于二者之间；在1～8月份土壤水分的有效性逐渐降低，9～12月土壤水分得到恢复，有效性提高。

This thesis analyzes the Locusts soil moisture in different geographic locations, different times and different slope in Loess Plateau through observation by position and introduction of soil moisture effectiveness standards. The results is. From south to north, from 0 to 600 cm in locust,the soil moisture ef- fectiveness decline. Chunhua-county and Yanan is middle-efficiency water and Yanan is slight deficit. Mizhi county is low-efficiency water and is mild deficit. The effectiveness of soil moisture is the highest in north-slope, the lowest in south-slope, between the two in east-slope and west-slope. The effectiveness of soil moisture gradually reduced in January to August. The effectiveness of soil moisture restores and increase in September to December.