新疆沙冬青生态环境及渐危原因的研究

本文通过对珍稀渐危植物新疆沙冬青的野外调查，并结合自然分布区的气候条件，对其生态环境中的温度、水分、光照和土壤等因素进行分析；并对新疆沙冬青渐危的原因进行探讨，初步认为其天然灌丛减少的原因是：1．种子不易传播；2．种子被害虫蛀食率高；3．落地种子不易获得适宜生长发育的条件；4．随意樵采破坏。

STUDY FOR THE ECOLOGICAL ENVIRONMENT AND VULNERABLE REASONS OF THE AMMOPIPTANTHUS NANUS

The rare endangered plant Ammopiptanthus nanus is a kind of evergreen broadleaved shrub endemic to the desert in the central part of Asia. It is only distributed in Kezilesu Kirgiz Autonomous Prefecture of Xinjiang and the Soviet Union. Now the plant is under the second-grade protection of the state and the first-grade in Xin- jiang.Through the f ield investigation on Ammopiptanthus nanus and in the light of the climate conditions in the range, this paper analysed temperature, illumination, moisture and soil in the ecological environ- ments. The vulnerable reasons of the plant was studied.As a result of analysis and study, the bioecological characteristics of Ammopiptanthus nanus have been found preliminarily as follows:Cold resistant, heat resistant and tolerant to wide range of temperature variation,light demanding with some features of shade prefe- rence; drought resistante, and fairly salinization resistant.The vulnerabling of the plant can be attributed to: 1. Special shape of the seed which makes the seeds difficult to spread and to get the suitable conditions for growth, 2. Prone to pests. 3. Upplaned cutting of the plant for firewood.In view of the above results,we suggested the conservation should be started at once, besides, nature reserver supported with necessary protective measures must be established as soon as possible.