干旱区非地带性植被生态需水量的研究

根据塔里木河和黑河流域典型植物的随机抽样研究,建立的干旱区非地带性植被生长与地下水位关系模型为对数正态分布,并计算得出干旱区典型植物生长与地下水位埋深关系。结果表明:植被在最适地下水位生长最好,合理的生态地下水位埋深应保持在2～4m之间。计算结果与干旱区石羊河实测及调查资料比较,当地下水埋深胡杨2.51m、柽柳2.29m、芦苇1.36m、罗布麻2.51m、甘草2.93m、骆驼刺2.84m时,相应盖度最高,模型与实测结果相符,对干旱区非地带性生态恢复和重建有一定的指导意义。

Water Demand of Non-belt Vegetation in Arid Regions

According to the random sampling research of the typical plant of Talimu river and Heihe river basin,the model of the relation between the growth of non-belt vegetation in arid area and the groundwater level was established,which conforms to logarithm normal distribution.Moreover,the relation between the growth of typical plant in arid area and the groundwater level burying depth was obtained by calculation.Results indicated that the vegetation grew best in the most suitable groundwater level,and the reasonable burying depth of ecological groundwater level was supposed to maintain between 2 meter and 4 meter.According to the comparison between the calculation and the arid area Shiyang River's actual data and investigation material,if leaved poplar's burying depth was 2.51m,Chinesetamar 2.29m,reed 1.36m,bluishdogbane 2.51m,licorice 2.93m,camel thorn-2.84m,the corresponding degree of their coverage were the highest.The model and the experimental results matched well.