【作者】 段爱国； 崔永忠； 张建国； 何彩云； 李昆；

【Author】 Duan Aiguo~1,Cui Yongzhong~2,Zhang Jianguo~(1+),He Caiyun~1,Li Kun~2 (1.Research Institute of Forestry,CAF;Key Laboratory of Tree Breeding and Cultivation,State Forestry Administration,Beijing 100091,China; 2.Research Institute of Resource Insects,CAF,Kunming 650224,China)

【机构】 中国林业科学研究院林业研究所,国家林业局林木培育重点实验室； 中国林业科学研究院资源昆虫研究所；

【摘要】 植物光合与水分生理特征是植物逆境适应能力评价的重要参考指标。极端生境下,水分条件有时成为造林成败的关键。本研究探讨了元谋金沙江干热河谷三个主要造林树种光合与蒸腾作用在由灌溉引起的不同土壤水分条件下的空间差异及干热季转向湿润季时的时序差异。结果表明,灌溉能有效地提高植被恢复树种在3月干季和5月干热季时的叶水势;灌溉能显著减轻或解除木豆、大叶相思和印楝在干季或干热季节所受到的光合抑制,且其对光合能力的影响作用主要体现在干热季节,而随着湿润季节的来临而减弱;无论在干季、干热季节,抑或在湿润季节,灌溉条件下供试树种的蒸腾速率均高于无灌溉条件时;灌溉对水分利用效率的影响因树种、季节而异。更多还原

【Abstract】 Plant photosynthesis and transpiration are important reference indices for evaluating the adaptable ability in adversity.In extreme growth environment,the soil water condition often becomes key factor that decides the success or failure of reforestation.Soil water effect of photosynthesis and transpiration of three tree species for vegetation restoration in dry season,dry-hot season and wet season of the dry-hot river valleys was analyzed.The results showed that,Comparing with nonirrigation,irrigation could effectively improve leaf water potential of the tested three tree species for vegetation restoration in dry March and dry-hot May.Irrigation could significantly relieve photosynthesis restrict from dry-hot stress in dry or dry-hot season for Cajanus cajan(L.) Millsp.,Acacia auriculiformis A.Cunn.and Azadirachta indica A.Juss.in Yuanmou dry-hot river valley.The effect extent of soil water difference caused by irrigation on photosynthesis ability was more obvious in dry or dry-hot season than in wet season, while wet season came,the dry-hot stress got relieved,the effect decreased at great extent or disappeared. Whether in dry,dry-hot season or wet season,irrigation all promoted transpiration rate(Tr) of the tested tree species which was accordant with the change of net photosynthesis rate.The change of water using efficiency(WUE) with irrigation was relatively sophistical,the effect was different with different tree species and seasons.更多还原