摘要
采用盆栽控水法人工模拟干旱胁迫,设置土壤含水量为土壤田间持水量的15%（W1）、30%（W2）、45%（W3）、60%（W4）和充足供水（ck）5个水平,研究干旱对3年生橙红丹桂（Osmanthus fragrans＂Chenghongdangui＂）叶片光合性能的影响。结果表明：①干旱胁迫下,净光合速率Pn、气孔导度Gs、胞间CO2浓度Ci和蒸腾速率Tr降低,水分利用效率WUE升高;②在土壤含水量比较充足的环境条件下（W4和ck）,橙红丹桂对强光（1 000~2 000μmol.m-2.s-1）有较强的耐受能力,同时对弱光（0~400μmol.m-2.s-1）也有较高的转化和利用效率;③干旱胁迫下,表观量子效率AQY、光饱和点LSP、表观羧化效率ACE降低,光补偿点LCP、CO2补偿点CCP升高。
Effects of drought stress on photosynthetic properties of 3-year potted Osmanthus fragrans ＂Chenghongdangui＂ seedlings were investigated.The seedlings were treated with different soil water regime at five levels.Using LI-6400 portable photosynthesis system,the net photosynthetic rate（Pn）,stomatal conductance（Gs）,intercellular CO2 concentrations（Ci） and transpiration rate（Tr） were measured on 7th、14th、21th、28th day after treatments,and the light response curves and the CO2 response curves of the net photosynthetic rate were measured on the 15th day after treatments.The results showed that soil moisture content had significant effect on the photosynthetic parameters of O.fragrans ＂Chenghongdangui＂.Increasing of drought stress could significantly reduce Pn,Gs,Ci and Tr,but enhance WUE.The test indicated that the plant could adapt to a wide range of high light intensity（photosynthetically active radiation being 1000 ~ 2000 μmol？m-2s-1）,and had a high efficiency in transforming and using lower light intensity（photosynthetically active radiation being 0 ~ 400 μmol？m-2s-1）.In addition,drought also had an obvious impact on the light compensation point（LCP）,light saturation point（LSP）,apparent quantum yield（AQY）,the CO2 compensation point（CCP） and apparent carboxyl efficiency（ACE）.In general,AQY,LSP and ACE decreased,but LCP and CCP increased with drought stress increasing.
出处
《浙江林业科技》
北大核心
2011年第3期5-10,共6页
Journal of Zhejiang Forestry Science and Technology
关键词
CO2响应
干旱胁迫
橙红丹桂
光合生理特性
CO2 response
drought stress
Osmanthus fragrans ＂Chenghongdangui＂
photosynthetic properties
