摘要
通过盆栽实验研究1a生紫穗槐(Amorpha fruticosa)在不同水分处理(土壤相对含水率为40%,60%,80%,100%)及重金属铅胁迫水平(0,1 000,2 000,4 000,6 000mg/kg)交互作用下叶绿素含量、净光合速率和水分利用效率的变化。结果表明:在水分和铅交互胁迫下,紫穗槐叶绿素含量变化无明显规律可循,铅含量<4 000mg/kg时,不同水分胁迫条件下紫穗槐叶绿素含量呈逐渐下降趋势,铅含量>4 000mg/kg时,不同水分胁迫条件下紫穗槐叶绿素含量呈逐渐上升趋势。水分和铅交互胁迫下,紫穗槐净光合速率呈下降趋势,铅含量<2 000mg/kg时,不同水分胁迫条件下紫穗槐净光合速率逐渐上升,铅含量>2 000mg/kg时,不同水分胁迫条件下紫穗槐净光合速率逐渐下降。在水分和铅交互胁迫下,紫穗槐水分利用效率呈上升趋势,土壤相对含水率为40%(重度水分胁迫)时,紫穗槐水分利用效率最大。
The theory of the changes of chlorophyll content,net photosynthesis rate and water use efficiency in annual of Amorpha fruticosa seedlings treated was explored by different levels of water（40%,60%,80%,and 100%） and lead（0,1 000,2 000,4 000,and 6 000 mg/kg） through the pot experiment.The results showed that the change of chlorophyll content of Amorpha fruticosa seedlings had no obvious regularity under interactive stress,under lead less than 4 000 mg/kg,chlorophyll content of Amorpha fruticosa seedlings decreased in different water stress conditions,under lead more than 4 000 mg/kg,chlorophyll content of Amorpha fruticosa seedlings increased in different water stress conditions.Net photosynthesis rate of Amorpha fruticosa seedlings decreased gradually under interactive stress,under lead less than 2 000 mg/kg,net photosynthesis rate of Amorpha fruticosa seedlings increased in different water stress conditions,under lead more than 2 000 mg/kg,net photosynthesis rate of Amorpha fruticosa seedlings decreased in different water stress conditions.Water use efficiency of Amorpha fruticosa seedlings increased gradually under interactive stress,water use efficiency of Amorpha fruticosa seedlings reaches to a maximum value when relative soil water content was 40%（severe water stress）.
出处
《水土保持研究》
CSCD
北大核心
2013年第3期146-149,154,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金项目(31170579)
高等学校博士学科点专项科研基金资助课题(20110204110009)
关键词
紫穗槐
交互胁迫
叶绿素
净光合速率
水分利用效率
Amorpha fruticosa
interaction stress
chlorophyll content
net photosynthesis rate
water use efficiency
