摘要
采用人工供水的方法 ,对油松、侧柏、刺槐进行 1 5 ,1 0 ,0 5倍降水量的灌水处理 ,形成一定的土壤含水量样度 ,测定灌水后 3树种的生理指标 ,结果表明 :1 5 ,1 0 ,0 5倍灌水处理后 ,油松、侧柏、刺槐的净光合速率分别比对照提高 60 2 % ,63 3% ,2 5 0 % ;63 5 % ,2 7 9% ,5 1 %和 5 7 7% ,2 7 0 % ,4 9% .供水对油松的促进作用最为明显 .生长季中 ,各树种的光合速率和蒸腾速率变化具有双峰型特点 .油松、侧柏、刺槐在生长季中 ,1 5 ,1 0 ,0 5倍灌水处理及对照蒸腾速率平均为 0 41 6× 1 0 - 4 ,0 383× 1 0 - 4 ,0 345× 1 0 - 4 ,0 30 8× 1 0 - 4 mol/g·s;0 35 2× 1 0 - 4 ,0 32 2× 1 0 - 4 ,0 30 2× 1 0 - 4 ,0 2 2 7× 1 0 - 4 mol/g·s和 0 0 0 9,0 0 0 9,0 0 0 8,0 0 0 7mol/m2 ·s.各处理叶水势的测定表明 :随土壤含水量的增大树木叶水势随之升高 ,且油松的水势高于侧柏 。
Plants of Pinus tabulaeformis , Platycladus orientalis and Robinia pseudoacacia were irrigated by supporting 1 5,1 0,0 5 times of precipitation to form soil water steps.It was showed that the net photosynthetic rate of P.tabulaeformis,P.orientalis,R.pseudoacacia was increased by 60 2%,63 3%,25 0% and 63 5%,27 9%,5 1% and 57 7%,27 0%,4 9% than those of controls respectively in treating of 1 5,1 0,0 5 times precipitation.The change of photosynthetic rates and transpiration rates appeared two peaks.In growing season,the average transpiration rates of P.tabulaeformis,P.orientalis,R.pseudoacacia are 0 416×10 -4 ,0 383×10 -4 ,0 345×10 -4 ,0 308×10 -4 mol/g·s;0 352×10 -4 ,0 322×10 -4 ,0 302×10 -4 ,0 227×10 -4 mol/g·s;0 009,0 009,0 008,0 007 mol/m 2·s in 1 5,1 0,0 5 times and control.The test showed that the leaf water potential increased along with the soil water,and the leaf water potential of P.tabulaeformis was higher than that of P orientalis.
出处
《西南林学院学报》
2002年第4期1-4,8,共5页
Journal of Southwest Forestry College
基金
陕西省自然科学基金项目 (sm0 97)
