毛乌素沙地沙生植物蒸腾规律探讨

A study of plant transpiration rules in Mu Us Desert

用快速称质量法测定宁夏盐池县沙泉湾生态示范区内的代表性植物柠条、沙柳、沙蒿、赖草在生长季的蒸腾速率,同时测定环境因子的变化.结果表明,人工植被柠条的蒸腾速率变化为单峰曲线形式,而同为人工植被沙柳的蒸腾速率为双峰曲线形式.天然植被沙蒿和赖草的蒸腾速率变化都为双峰曲线形式,4种植物都具有适应干旱环境的水分生理特性,但是各自的抗旱方式不同.随着温度的升高,4种植物的蒸腾速率都有增加的趋势,由于不同土层的土壤含水率不同,影响了植物蒸腾速率的高低.

The transpiration vate of the representative plants in their growing period, which were planted at Shaquan Band ecological demonstration in Yanchi of Ningxia were measured with the quick weighing method. And the variation of environment factors and soil moisture were surveyed at the same time. According to the results, the transpiration vate of the man-made vegetation Caragana rnicrophylla Lam showed a single-peak curve, while the transpiration vate of Salix psammophilo C. Wang et CH. Y. Yang presented a double-peak curve, which was similar to that of the natural vegetation, Arternisia ordosica Krasch. and Leyrnus secalinus （Georgi） Tzvel. The transpiration vate of the plants increased with the rising of temperature, and was influenced by the soil moisture. The plants could adapt the arid environment with different mechanism to resist drought.