摘要
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.
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.
出处
《植物资源与环境学报》
CAS
CSCD
2000年第3期54-56,共3页
Journal of Plant Resources and Environment
基金
国家科技部中俄国际项目
水利部"948"引进项目!(No .975 15 4)
关键词
半干旱黄土丘陵区
沙棘
抗旱性
semiarid loess hilly region
Hippophae rhamnoides L.
drought-resistance