摘要
统计了狭叶山黄麻 (Trema angustifolia BL .)和光叶山黄麻 (Trema cannabina L our)腊叶标本在近一世纪里的气孔密度 ,并利用叶中 δ1 3 C值推算了它们在这段时期的潜在水分利用率。结果表明 ,从 2 0世纪 2 0年代到 90年代 ,狭叶山黄麻和光叶山黄麻的气孔密度分别降低 2 8.1%和 40 .0 % ;潜在水分利用率分别增加 19.5 %和42 .2 %。相关分析表明 ,在这 70年里 ,两种植物的气孔密度与大气 CO2 浓度成显著负相关 ,而它们的潜在水分利用率与大气 CO2 浓度成显著正相关。
The stomatal densities of herbarium specimens of Trema angustifolia BL.and T.cannabina Lour were investigated,and the intrinsic water use efficiency of both species was computed from δ 13 C values in their leaves.From 1920 to 1990,the stomatal densities of T.angustifolia and T.cannabina reduced by 28% and 40% respectively,while their intrinsic water use efficiency increased by 20% and 42% respectively.Changes in these parameters with time (and therefore with increasing of atmospheric CO 2 concentration)were significant in both species:with stomatal densities declining and water use efficiency increasing with time.
出处
《植物生态学报》
CAS
CSCD
北大核心
2001年第4期405-409,共5页
Chinese Journal of Plant Ecology
基金
国家自然科学基金重大项目 (39899370 )
广东省基金 (980 95 2 )
中国科学院重大项目 (KZ95 1-B1-110 )
