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干旱胁迫对苗木蒸腾耗水的影响
引用本文:李吉跃,周平,招礼军.干旱胁迫对苗木蒸腾耗水的影响[J].生态学报,2002,22(9):1380-1386.
作者姓名:李吉跃  周平  招礼军
作者单位:北京林业大学,北京,100083
基金项目:国家自然科学基金项目 (3 0 0 70 63 7),教育部高等学校博士点基金,骨干教师资助项目
摘    要:采用Lico-6400便携式光合系统测定仪和BP3400精密天平等仪器研究了9个北方主要造林树种的蒸腾速率及实际蒸腾耗量;用压力室法分阶段测定了苗木的叶水势。得出了苗木在正常水分条件下及干旱胁迫过程中的蒸腾耗水规律。比较分析了不同水势梯度下、昼夜不同时间段的各树种的蒸腾耗水量及蒸腾耗水速率。结果表明,蒸腾耗水以白天为主,在相同的水分条件下,不同的苗木有不同的蒸腾耗水量,同种苗木的蒸腾耗水量随干旱胁迫的加重而减少,在受到严重干旱胁迫时,针叶树油松和侧柏的耗水量均降至正常水分条件下的11.7%,阔叶乔木树种降至6.6%,灌木树种降至16.9%。通过研究苗木在不同水势梯度下的耗水特性和蒸腾耗水量。为在水量缺乏的情况下,进行有效的林木培育和植被恢复重建提供依据。

关 键 词:干旱胁迫  苗木  蒸腾耗水  树种  水势
文章编号:1000-0933(2002)09-1380-07
收稿时间:2002/1/22 0:00:00

Influence of Drought Stress on Transpiring Water-consumption of Seedlings
LI Jiyue,ZHOU Ping and ZHAO Lijun.Influence of Drought Stress on Transpiring Water-consumption of Seedlings[J].Acta Ecologica Sinica,2002,22(9):1380-1386.
Authors:LI Jiyue  ZHOU Ping and ZHAO Lijun
Institution:Beijing Forestry University; Beijing; China
Abstract:Transpiration rates and water consumption of nine main plantation tree species in North China were studied by using Lico 6400 Portable Photosynthesis System and BP3400 Precision Balance etc.. Leaf water potential was measured using pressure chamber in different phase. The water consumption patterns of seedlings were observed in normal water supply and drought stress conditions. The quantity and rate of water consumption were compared and analyzed in different water potentials and in times of day and night. It was showed that water consumption by transpiration mainly occurred in daytime, different seedlings had different water consumptions in the same water status, and with the drought stress increasing, and the water consumption of seedlings decreased with increasing drought stress. When the seedlings were in serious drought stress, water consumption of conifer Pinus tabulaeformis and Platycladus orientalis decreased in 11 7% of that in normal water condition, that of broadleaf arbor decreased in 6 6% and shrubbery decreased in 16 9%. It suggested that the present study focusing on water consumption characteristic and consumption value in different water potentials would be beneficial to afforestation and vegetation reconstruction under condition of water deficiency.
Keywords:drought stress  water potential  water consumption  water consumption characteristic
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