民勤荒漠植被的初步研究

民勤荒漠植被种类贫乏，结构简单，受地下水位下降的影响，形成了以唐古特白刺为建群种的顶极群落，其它植物种群均在衰退；降水量在现实状况下以木本植物的影响很小，对秋季短生植物影响较大，本区植被的演替趋向强旱生化。

A Preliminary Study on the Desert Vegetation in Minqin

The desert vegetation in Minqin has poor forms and simple st-ructure. It is affected by the descent of the underground water table,andhas formed climax desert plant community with Nitraria tangutum,as aed-ificator. Other plant communities are all waning.Altliough rainfall has littleimpact on xylophyte, but it cam considerably affect the ephemeral plants ofautumn.The succession of plant cover in this atea tends to be xerophiliza-tion greatly.