摘要
在西南喀斯特地区,采用土壤干旱胁迫的方法,对不同土壤水分条件下一年生构树苗木的生理指标进行了观测,研究其对土壤干旱胁迫的生理响应。结果表明:随着土壤干旱胁迫的加剧,构树的叶水势、净光合速率、蒸腾速率、气孔导度和水分利用率都有所下降,表明构树有较高的耐旱生产潜力,对水分亏缺的适应能力也较强。阐明了其能够在退化喀斯特生境中生存的生理基础。
In southwest Karst region, physiological indicators of Broussonetia papyrifera seedlings to dif- ferent soil water conditions were measured by means of soil drought stress, its physiological responses to soil drought stress were studied. The results showed with the aggravation of soil drought stress, leaf water potential, net photosynthesis rate, transpiration, stomata conductance and WUE（water using efficiency） of Broussonetia papyrifera seedlings decreased, which indicatd Broussonetia papyrifera had high drought-tolerant potential productivity and strong adaptability to water deficiency in Karst forest. These illustrated the physiological basis that Broussonetia papyrifera can survive in degraded karst habitat.
出处
《水土保持研究》
CSCD
北大核心
2010年第2期164-167,共4页
Research of Soil and Water Conservation
基金
国家"十一五"科技支撑计划项目(2006BAC01A09
2006BAD03A1006)
国家重点基础研究发展规划项目(973)(2006CB403206)
国家自然科学基金项目(10961008)
关键词
构树
幼苗
干旱胁迫
生态适应
西南喀斯特
Broussonetia papyrifera
seedlings
drought stress
ecological adaption
Southwest Karst Region
