臭椿苗木蒸腾速率及其对环境因子的响应

2006年5—10月在山西方山北京林业大学试验基地，采用LI-1600稳态气孔仪，对不同土壤水分条件下盆栽臭椿的生理指标进行了观测，比较分析了不同水势梯度下、不同时间段臭椿蒸腾耗水速率的变化规律。结果表明：蒸腾速率与生理辐射光量子强度成幂函数关系；蒸腾速率、气孔阻力和土壤体积含水量之间存在着密切的关系；蒸腾速率一般随光强的增强和土壤水分的提高而增大，臭椿蒸腾速率与土壤水分含量的决定系数平均可达0．8917。通过研究不同土壤水分条件下臭椿蒸腾速率的差异，得出臭椿水分利用效率的合理供水范围为15％～20％，为干旱半干旱地区提高林木的水分利用效率提供了理论依据。

Study on the transpiration of seedling of Ailanthus altissima and its response to environmental factors

Transpiration characteristic of Ailanthus altissima,major tree for forestation in the Loess Plateau was analyzed.Physiological indices of Ailanthus altissima in different soil water conditions were measured by portable steady porometer(LI-1600) during the period of May to October of 2006,in Fangshan, Shanxi Province(Forestry Experimental Station of Beijing Forestry University). The response processes of physiological absorbed radiation,stomatal resistance,transpiration rate to different soil water content w...