摘要
采用人工控制土壤水分的方法,利用模拟光源研究了柠条锦鸡儿（Caragana korshinskii Kom.）和树锦鸡儿（C.arborescens Lam.）苗木的蒸腾速率、净光合速率、水分利用效率等随模拟光辐射强度增强而变化的规律,从而为林木栽培和苗木管理提供科学依据。结果表明,在设定的光辐射强度为0~2 000μmol/（m2·s）范围内,不同土壤含水量下的柠条锦鸡儿和树锦鸡儿其叶片净光合速率、蒸腾速率与水分利用效率等均随光辐射强度的增强而呈先增大、后减小的变化趋势。在土壤含水量为16%~18%、光辐射强度为800μmol/（m2·s）的条件下,2种锦鸡儿苗木的水分利用效率均达到最大。其中树锦鸡儿苗木对强光的适应能力更强,但柠条锦鸡儿苗木的水分利用效率高,节水能力强。
With artificially controlled soil moisture and simulated optical radiation, the changing rules of transpiration rate（Tr）, net photosynthetic rate（Pn）, water use efficiency（WUE） of Caragana korshinskii Kom and C. arborescens Lam under different simulate optical radiations intensity were studied in order to provide a scientific basis for tree cultivation and management. The results showed that within the setting of simulated optical radiation at 0 ~2 000 μmol /（m2·s）, under different soil moisture content, Tr, Pn, WUE of C. korshinskii and C. arborescens firstly increased then decreased as simulated optical radiations intensity strengthening. When the soil moisture was 16% to 18%, optical radiations intensity was800 μmol /（m2·s）, the WUE of C. korshinskii and C. arborescens was maximum. The adaptability of C. arborescens to hard light was stronger while C. korshinskii had higher WUE and stronger water saving ability.
出处
《湖北农业科学》
2015年第16期3970-3973,3985,共5页
Hubei Agricultural Sciences
基金
国家星火计划项目(2012GA870001)
中央财政林业科技推广示范项目(ZCT[2014]-002)
