太行山低山区主要植被下土壤贮水量和土壤水分利用效率研究

采用大型非称重式蒸渗仪法,通过对太行山低山区主要植被黄背草、荆条及其混合植被下的土壤水分及以上3种植被水分利用状况的初步研究,结果表明:不同植被下土壤贮水量的季节变化随着降雨量及季节变化而变化,植被生长期降雨量多的年份,土壤贮水量大,降雨量小的年份,土壤贮水量小;3种植被不同坡度下水分利用效率,平坡大于斜坡,丰水年,混合植被水分利用效率最高,枯水年,黄背草水分利用效率最高。

Study on Soil Moisture Characteristics and Water Use Efficiency of Three Different Vegetations in the Low Taihang Montains Areas

Soil moisture characteristics and water use efficiency of three typical vegetation communities were analyzed using large non-weighing drainage lysimeters.The vegetation communities include Themeda japonica community,Tanaka Vitex negundo var.heterophylla community and the mixture of them.The results showed that the soil water storage capacity under different vegetation communities was changed with the seasonal pricipitation,the more precipitation of the year,the more soil water storage capacity;The WUE of slope vegetation communities was much more than flat slope,and the WUE of mixture of community was highest in the wet year,the WUE of Themeda japonica community was highest in the dry year.It indicated that the Themeda japonica community had higher drought resistance.