Root Vigor and Photosynthetic Diurnal Courses of 5 Kinds of Native Species After Drying in the Lhasa River Valley
Based on the low survival rate of forestation in the Lhasa River Valley,effects of the water content on seedlings vigor was analyzed,which would provide the scientific basis of protection and enhancement the survival rate of forestation.In this paper,Populus szechuanica var.tibetica,P.alba var.alba,Salix microsiachya,S.paraplesia var.subintegra and Hippophae gyantsensis were used as the research objects.Their stocks were dried for different lengths of time,and the growth vigor and photosynthetic diurnal courses of seedlings were measured after transplantation.The drying time was set to be 0,2,4,6 and 8 h.The results showed that the seedling vigor and photosynthetic capacity were closely related with their water content.With the increase of drying time,the root activity,the growth in height and the photosynthetic capacity of seedlings decreased after transplantation,eventually leading to the reduction of survival rate of seedlings.The time limit of drying was 4 h for P.szechuanica var.tibetica,6 h for P.alba var.alba,S.microsiachya,S.paraplesia var.subintegra,and 8 h for H.gyantsensis.It is crucial to protect the root,which is good for maintaining the seedling vigor and improving the survival rate in the Lhasa River Valley.
Lhasa River Valleynative treeair-dryingroot vigorphotosynthetic diurnal course
国家科技期刊平台
NSTL
万方数据
维普
