赤峰杨幼林枝条水势及生长对水分胁迫的响应

通过对赤峰杨幼林地进行控水试验,测定了不同程度干旱胁迫下赤峰杨枝条水势、幼林平均株高、地径生长量及生长状况等指标。结果表明,当土壤含水量高于15.6%时,赤峰杨枝条水势没有明显变化,低于11.03%时,枝条水势迅速下降;当土壤含水量大于(17.72±2.75)%时,赤峰杨幼树生长正常,生长量增加趋势快速明显,而当土壤含水量低于(7.12±2.75)%时,赤峰杨出现严重衰退特征,生长基本停滞,个体开始出现死亡。综合分析枝条水势、株高生长、地径生长等指标,表明有利于赤峰杨幼林快速生长,并维持林分稳定的适宜土壤水分含量为大于(17.72±2.75)%。

Response of Branch Water Potential and Growth on Water Stress of Populus×Xiaozhuanica Young Forest

The branch water potential, average tree height and basal diameter of P.×Xiaozhuanica young forest were determinated based on the water controlling experiment. The results showed that there was no significant change for the branch water potential of P.×Xiaozhuanica when the soil water content was higher than 15.6%, but the branch water potential decreased rapidly when the soil water content was less than 11.03%. The young forest grew normally and the growth amount increased significantly when the soil water content was higher than(17.71±2.75)%. However, the young forest showed up severe recession characteristics, nearly stop growing, and some of the tree even dying when the soil water content was below(7.12±2.75)%. Therefore, the perfect soil water content should be(17.72±2.75)% for the rapid growth and maintaining the stability of P.×Xiaozhuanica young forest.