天然胡杨林与人工林蒸腾特性比较研究

The Traits of Populus Euphratica Transpiration Intensity in Artificial and Natural Forest

本文对天然胡杨林与人工胡杨林蒸腾特性进行了比较研究.结果表明:人工胡杨和天然胡杨生长的土壤水分有很大差异,但蒸腾强度总值基本接近,说明人工种植和天然生长的同龄胡杨对水的需求是基本一致的;差异在于蒸腾速率最大值一项天然林胡杨明显大于人工林胡杨,蒸腾速率的波动存在差异,人工林胡杨表现为"双峰",而天然林胡杨表现为"单峰";气孔蒸腾是胡杨蒸腾作用的主要形式,主要受光照强度和空气湿度的影响;胡杨属光湿型,喜湿,耐光照植物,必须保持一定的土壤水分,才能保证它们基本的正常生长.

This paper studied on the transpiration traits of Populus euphratica planted by human and grew in nature and the influence on them by environmental factors. The results showed that although there is great difference in soil water between artificial and natural Populus euphratica forest, the total transpiration intensity is similar to each other, indicating that artificial and natural Populus euphratica having the same age need equal transpiration water; there are differences in the maximal transpiration rate and the diurnal fluctuation between artificial and natural Populus euphratica. The maximal value of transpiration rate of the natural forest is significantly more than that of the artificial one, the fluctuation behaves ‘double-peak’ curve in the artificial Populus but a ‘single-peak’ curve in the natural one; stomatal transpiration influenced by light intensity and humidity is the main form of transpiration in artificial and natural Populus forest. Those results also indicated that Populus belongs to light-humidity type, liking humidity, lightfastness, so certain amount of water in the soil is needed to guarantee the basic growth of Populus.