黄土丘陵区沙棘抗旱性的分析

The analysis of the drought-resistance of Hippophae rhamnoides L. in loess hilly region

Under drought condition, the characteristics of water physiology, photosynthetic rate and growth of \%Hippophae rhamnoides \%L. were analysed. The results showed: (1) In dry season, leaves of \%Hippophae rhamnoides \%L. can keep higher relative water content, big critical saturation deficiency, higher bound water content and bigger ratio of bound water to free water, weak transpiration intensity, low leaf water potential; (2) Under the condition of drought, transpiration intensity of \%Hippophae rhamnoides \%L. weakens, photosynthetic rate goes down, it can keep exuberant vitality and normal growth through adjusting by water itself. but change range of transpiration intensity is bigger than that of photosynthetic rate for changing of water condition; (3) The way for drought\|resistance of \%Hippophae rhamnoides \%L. belongs to typical dry\|hardiness, and under the condition of drought, it reduces water consumption through transpiration intensity, which implies it has the characteristic of keeping out drought. This is the comprehensive reflection of dry\|resistance formed by long\|term adapting the habitat of semiarid loess hilly region, and makes it has stronger capability of drought\|resistance. These are important to forestation and drought\|resistant variety breeding of \%Hippophae rhamnoides \%L.