苗木从起苗到造林期间往往因失水而造成苗木质量下降.这种质量下降在形态上难以反映出来.本研究对兴安落叶松苗木失水过程中引起的生理变化进行了研究,发现水势变化与苗木成活率和放叶早晚有密切相关关系.在苗木失水过程中细胞膜损伤率逐渐增加,细胞外渗液电导率也逐步增加,表明失水引起了膜透性和结构的变化.所以用水势.细胞膜损伤率作为苗木质量的生理指标是可行的. Seedlings from seedling to afforestation often due to water loss caused by seedling quality decline.This decline in quality is difficult to reflect the morphological characteristics of Larix gmelinii seedlings in the process of water loss caused by the study found that changes in water potential And the survival rate of seedlings and leaves are closely related to the early or late. In the process of seedling water loss, the cell membrane damage rate gradually increased, the conductivity of the cell exudate also increased gradually, indicating that water loss caused membrane permeability and structural changes.So water Potential cell membrane damage as a physiological indicator of seedling quality is feasible.