阿拉善白刺生长季需水量估算

Estimation of Water Requirement for Growth of Nitraria tangutorum in Alxa League

为了探究阿拉善白刺单株、群落生长季需水量,对阿拉善白刺群落需水量进行了研究。结果表明:(1)白刺的蒸腾量随着地径不同,表现出显著差异,地径越大,蒸腾量越大。从液流变化规律看,白刺液流高峰出现在15:00左右。(2)阿拉善盟白刺各月日均耗水量最大的月份为7月,日平均液流量为1 154.3g·cm^(-2),各月耗水量大小依次为7月>8月>6月>9月>5月>10月。(3)以地径作为纯量,计算出白刺灌丛的日蒸腾总量和单株蒸腾量估算值分别为0.065m^3和0.000 4m^3。(4)阿拉善盟白刺的最大生态需水量为4.34×10~8 m^3,实际生态需水量为3.23×10~8 m^3。

In order to investigate the water requirement of the individual and the growing season of Nitraria tangutorumin Alxa League,the water demand of Nitraria tangutorumin Alxa League was estimated.Result shows that：1）The transpiration rate of Nitraria tangutorumshowed obvious differences with the diameter of the ground diameter.The thicker the diameter,the larger the transpiration amount.From the change rule of liquid flow,the highest peak of Nitraria tangutorumflow appears at about 15：00.2）The monthly average daily water consumption of Nitraria tangutorumin Alxa League is July,the average daily liquid flow rate is 1 154.3 g · cm^（-2）,and the monthly water consumption is respectively from July August June September May October.3）Taking the soil diameter as the pure quantity,the estimated daily transpiration amount and transpiration amount of Nitraria tangutorumin Alxa League is 0.065 m^3,0.0004 m^3.4）The maximum ecological water requirement of Nitraria tangutorumin Alxa league is 4.34 × 10~8 m^3.According to the soil water supply coefficient of different tree species,the actual ecological water quota and the actual ecological water requirement of Nitraria tangutorum were calculated.The actual ecological water requirement of Nitraria tangutorumis 3.23 × 10~8 m^3.