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EFFECTS OF SOIL MOISTURE ON GAS EXCHANGE AND BIOMASS ALLOCATION OF THREE BROAD-LEAVED SPECIES SEEDLINGS
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
- Issue:
- 1
- DOI:
- 10.3321/j.issn:1006-687X.2004.01.002
- Key Word:
- 水分胁迫;气体交换;生物量分配;茶条槭(Acer ginnala Maxim);山桃(Prunus davidiana Carr);山梨(Pyrus ussuriensis Maxim)
Abstract： 在温室内用盆栽法研究了土壤含水量对茶条槭、山梨和山桃的气体交换及生物量分配的影响.设置4种土壤水分处理(土壤相对含水量75.0%、61.1%、46.4%和35.4%).结果表明:随土壤含水量降低,3树种苗木净光合速率、蒸腾速率和气孔导度均下降,土壤含水量最低时,茶条槭苗木各生理指标降低幅度最大,山梨和山桃次之.茶条槭和山梨水分利用效率(WUE)随土壤含水量的减少呈降低趋势,山桃WUE呈升高趋势.水分胁迫下,3树种苗木根分配生物量显著增加.茶条槭在水分胁迫下,根冠比增加幅度最大,山梨次之,山桃最小.此外,茶条槭叶形态可塑性强,随土壤含水量降低,茶条槭单叶叶面积和总叶面积显著减小,叶厚度增加.山梨和山桃在水分胁迫下单叶叶面积及总叶面积无显著变化.综合3树种苗木在水分胁迫下的生理和形态指标及生物量分配的变化,茶条槭和山桃对水分胁迫的适应能力强于山梨. 表4 参31
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