摘要
在新疆和田地区墨玉县选取两年生的胡杨和新疆杨实生苗,栽植于苗圃进行不同灌溉水量的处理。不同处理下土壤的含水量分别为田间持水量的85%,70%,47%和24%。测定不同处理水平下胡杨和新疆杨在不同时刻的叶片水势,结果表明:胡杨和新疆杨的水势在一天中的变化趋势呈"V"字型,胡杨的水势日平均值高于新疆杨。利用Licor-6400便携式光合仪对两种杨树的净光合速率和蒸腾速率进行了测定,结果显示相同处理下胡杨的净光合速率和蒸腾速率的日平均值大于新疆杨,胡杨的瞬时水分利用效率高于新疆杨。此外,还测量了两种杨树的叶片的稳定碳同位素比率,结果显示胡杨的δ13C值显著大于新疆杨(p<0.05),表明它的长期水分利用效率较高。运用隶属函数综合各个指标的比较结果来看,胡杨的抗旱性强于新疆杨。
Two years old seedlings of Populus euphratica and Populus bolleana were chosen and planted, and then treated by different amount of irrigation in Moyu county, Xinjiang. The relative mean soil water contents of different irrigating treatment were 85%, 70%, 47% and 24% of field capacity. The leaf water potential of P. euphratica and P. boUeana under different conditions and at different time was shown variation trends of ＂V＂ figures in a day. The mean daily water potential of P. euphratica was higher than P. bolleana. The net photosynthetic rate, transpiration rate and transient water use efficiency of P. euphratica were higher than P. bolleana. The leaf δ^13C
value of P. euphratica was significantly higher than P. bolleana. The drought resistance of P. euphratica is higher than P. bolleana by Subordinate Function Value.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2009年第7期154-161,共8页
Journal of Arid Land Resources and Environment
基金
国家"十一五""林业科技支撑计划专题"防沙治沙植物材料筛选与扩繁技术(2006BAD26B0101)
国家"十一五""林业科技支撑计划课题"新疆活化沙丘的固定与绿洲防风固沙体系构建技术研究与试验示范(2006BAD26B09)资助
关键词
光合作用
抗旱性
水分利用效率
水势
Δ^13C
photosynthesis
drought resistance
water use efficiency
water potential
δ^13C
