植物群落水分生态研究中若干问题探讨

本文就植物群落中植物及群落的蒸腾特点、水分利用效率和水量平衡3方面的问题进行了探讨。认为在蒸腾特点研究中,快速称重法更适合在干旱半干旱地区使用,对群落的蒸腾过程也应当给予适当重视。在水分利用效率研究中,还应当重视蒸散效率的研究,并提出了“水分承载力”新指标,完善了衡量水分利用经济状况的指标体系。在水分平衡方面,认为如对经典的快速称重法计算群落耗水量的公式进行改进,用该方法测定群落耗水量是可行的。

Discusses on Some Questions in Water Ecology of Plant Community

The questions about transpiration characters, water use efficiency and water balance of plant and its community in plant community are discussed in this paper. It is believed that in the studies of transpiration characters, rapid weighing method is mostly suitable to be used in arid and semiarid regions,and we should pay attention to community transpiration;in the study of water use efficiency we also should pay attention to evapotranspiration efficiency; and put forward a new index-water-bearing capacity to perfect the index system of water use economy;in the study of water balance,if calculation method of community's water consumption is improved, the rapid weighing method is acceptable in measuring the community's water consumption.