摘要
以陆地棉（中棉所２３号）为供试材料，应用盆栽试验，设计了３种间歇性遮光水平，即不遮光（ＣＫ）、遮光４０％（处理 Ⅰ）、遮光 ７５％（处理 Ⅱ），分析了间歇性遮光对棉花不同生育期晴天中午净光合速率、蒸腾速率、气孔导度、叶水势和水分利用效率的影响。结果表明，（１）间歇性遮光降低棉花蕾期、花期、铃期的净光合速率和水分利用效率，下降幅度是处理Ⅱ＞处理Ⅰ；（２）降低花期、铃期的蒸腾速率和气孔导度，但使蕾期的蒸腾速率和气孔导度增加；（３）对中午叶水势几乎没有影响。
Upland cotton (Gossypium hirsutum L. Zhongmiansou No.23) plants grown in pots were exposed to three intermittent shade levels with no-shading (CK), 40% shading (treatment I ), 75% shading (treatment Ⅱ ). Effect of intermittent shade on net photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (G_s), leaf water potential (LWP) and water use efficiency (WUE) of sunny midday at different stages were analyzed. The results of intermittent shade were: (1) a net reduction in P_n and WUE at bud stage, flower stage and boll stage, the decreasing proportions in P_n and WUE of treatment Ⅱ > treatment Ⅰ; (2) causing decreases in T_r and G_s at flower stage and boll stage, but increases in T_r and G_s at bud stage; (3) no changes in midday LWP.
出处
《土壤与环境》
CSCD
2000年第1期38-41,共4页
Soil and Environmental Sciences
基金
国家杰出青年基金项目!(49725102)
关键词
间歇性遮光
蒸腾特性
水分利用效率
棉花
intermittent shade
transpiration characteristics
water use efficiency
