摘要
本文以二年生刺槐为供试材料，探讨水分胁迫对其生理的影响，为园林绿地中刺槐的灌溉提供理论指导。结果表明，水淹和干旱胁迫明显影响刺槐的生长。水淹11d后，qP值、ETR值、Fv’／Fm’值和净光合速率的明显下降，qN值上升，19d后植株死亡。中度干旱胁迫（土壤含水量在8％～15％之间）对植株生长有一定影响，表现为净光合速率的下降和qN值上升等；干旱胁迫（土壤含水量低于10％）严重抑制植株的生长，表现为qN值上升，而qP、ETR、Fv’／Fm’和净光合速率下降，处理19d后干旱组植株死亡。轻度干旱（土壤含水量在15％～25％之间）适宜植物生长，表现为3次测定的qP、ETR、Fv’／Fm’、FV／Fm和净光合速率都较高且稳定。土壤含水量日变化在15％～25％以内受轻度干旱胁迫是园林中刺槐的最佳灌溉方式，既不影响景观效果，同时也能节约灌溉用水。
The effects of water stress on the two years old Robinia pseudoacacia L. were tested for proving the irrigation guidance for its application in the garden. The results showed that the water stress and the drought stress suppressed the growth ofRobinia pseudoaeacia L.. After treated with flooding for 11 days, the qP, ETR, Fv＇/Fm＇ and net photosynthetic rate were decreased, but the qN was increased and the plants were dead after treated for 19 days. The mid drought stress （the water content of soil was between 8 percent and 15 percent） decreased the growth of plants, which was embodied in the decreasing of net photosynthetic rate, the increasing ofqN and so on. The drought stress （the water content of soil remained below 10 percent） suppressed the growth of plants, which was embodied in the increasing of qN, the decreasing of qP, ETR, Fv＇/Fm＇, net photosynthetic rate and the plants almost died after treated for 19 days. The slight drought （the water content of soil was between 15 percent and 25 percent） was adapt for R. pseudoacaeia, which was embodied in having the high and stable qP, ETR, Fv＇/Fm＇, Fv/Fm and net photosynthetic rate. The best irrigation for R. pseudoaeaeia was the water content of soil between 15 percent and 25 percent, which did not affect the ornamental value ofRobinia pseudoacacia and saved the irrigation water.
出处
《基因组学与应用生物学》
CAS
CSCD
北大核心
2011年第6期714-721,共8页
Genomics and Applied Biology
基金
湖南省2011年研究生科研创新项目(CX2011B330)
中南林业科技大学研究生科技创新基金项目(2009sx17)
湖南省教育厅项目(10B120)共同资助
关键词
刺槐
水分胁迫
光合速率
荧光参数
Robinia pseudoacacia L., Water stress, Photosynthesis rate, Fluorescence parameters
