摘要
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)%。
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 high- er 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 characteris- tics, 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.
出处
《水土保持通报》
CSCD
北大核心
2014年第6期79-82,88,共5页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"半干旱区低覆盖度固沙林的水分动态及其应对极旱年的调节机理"(31170667)
国家重点基础研究发展计划项目(2013CB429901)
关键词
赤峰杨
枝条水势
水分胁迫
生长量
P.× Xiaozhuanica
branch water potential
water stress
growth amount
