摘要
测定了梭梭林中梭梭柴等7个树种的光合和水分生理生态特性,包括其光合和呼吸强度、叶绿素含量、气孔状况、光合产物的分配及初级生产力、水分利用效率等,发现荒漠树种具有较高的光合效率和水分利用效率,6一9月梭梭柴的平均光合强度为8.02C0_2mg/g,干重·h,它接近于中生树种新疆杨同期光合强度的平均值(8.39);白梭梭的蒸腾系数为250.12mg水/g干重,约是新疆杨蒸腾系数(502.45)的一半。荒漠树种的高光合和水分利用效率是它们长期适应高温干旱生态环境的结果。荒漠棱梭林通常仅作为薪炭林,这对光合产物的利用是很不经济合理的,需要改进。
After determination of the physiological property of photosynthesisand water relation of seven species of Saxoul forests including their inte-nsity of photosynthesis and respiration, chlorophyll conent, stoma status,distribution of photosynthetical outcome, primary productivity and utiliza-tion efficiency of water, etc. It was discovered that Eremophyte specieshave high efficiency of photosynthesis and water utilization. The averageintensity of photosynthesis of Haloxylon ammodendron during June to Se-ptember is 8.02 CO_2·mg/g dry weight. Hour, close to the Populus bolleana(8.39) which is amesophytes. The transpiration coefficient of HaloxylonPersicum (250. 12mg water/g dry weight) is about the half of Populus boll-eana (502.45). The high efficiency of photosynthesis and water utilizationof Eremophyte may be attributed to long adaptation to the ecological envi-ronment of high temprature and aridity. Currently, Saxoul forests are onlyused as firewood by local residents, which is neither economical nor rati-onable and needs improvement.
关键词
梭梭林
光合作用
蒸腾系数
荒漠
Saxoul forest
Photosynthesis
Transpiration coefficient
