摘要
通过测定麻疯树和枫杨幼苗在5种模拟喀斯特逆境下的光合以及δ^(13) C值的变化,分析其光合响应特征。结果表明,第15天,麻疯树幼苗在偏碱性、干旱、低磷、高重碳酸盐和低营养下的净光合速率(P_n)分别为4.39、0.27、2.58、3.08和6.26μmol·m^(-2)·s^(-1),第25天则分别变为4.09、0.66、4.57、3.83和4.04μmol·m^(-2)·s^(-1);枫杨幼苗的P_n和水分利用效率均低于麻疯树,枫杨幼苗在第25天的P_n有所升高。干旱下枫杨幼苗的初始荧光(F_o)显著升高,光系统II原初光能转化效率(F_v/F_m)显著下降,与麻疯树幼苗相比,其光合结构受到更为严重的损害。第25天各逆境下麻疯树幼苗的δ^(13) C值与对照相比显得更为偏正,其对胞内HCO-3的利用能力较强。因此,在山坡缺水环境适宜种植麻疯树,而在沿溪涧河滩阴湿环境则适宜种植枫杨。
The karst ecosystem is vulnerable and rocky desertification in karst regions develops rapidly. The situation of karst ecosystem becomes increasingly severe. In order to quickly build a stable forest ecosystem, it is better to select the appropriate plant species to carry out revegetation. Research on photosynthetic re- sponse traits can help to quickly identify plant adaptability to karst environment. In this study, 5 different karst adversities including high pH, high bicarbonate, drought, low phosphorus （P） and low nutrient were simulated, and Hoagland solution was taken as control. Jatropha carcas and Pterocarya stenoptera seedlings were cultivated with these treatment solutions synchronously. Photosynthetic response traits of these two plant species to 5 different simulated adversities were analyzed through determining the photosynthetic char- acteristics and variation of stable carbon isotopic compositions （δ13C）. On the 15th day, the net photosynthet- ic rates （Pn） of J. carcas seedlings under alkalescent, drought, low P, high bicarbonate and low nutrient were 4.39, 0.27, 2.58, 3.08, 6.26 μmol·m^-2·s^-1 , respectively. On the 25th day, the values became 4.09, 0.66, 4.57, 3.83, 4.04 μmol·m^-2·s^-1, respectively. P, and water use efficiency （WUE） of P. stenoptera seedlings were all lower than J. carcas seedlings. P,, of P. stenoptera seedlings under alkalescent, low P, high bicarbonate and low nutrient excepted for drought condition all increased on the 25th day com- pared to the values on the 15th day. On 25 days from the onset of adversity treatment, WUE of J. carcas seedlings under drought stress increased significantly, and was higher than the value under other adversities. However, WUE of P. stenoptera seedlings under drought stress remained the lowest compared to the values of WUE under other adversities. Initial fluorescence （Fo） and primary conversion of light energy of PSII （Fv/Fm） values in J. carcas seedlings were independent of adversities, there was no significant c
作者
邢德科
吴沿友
吴沿胜
于睿
黎明鸿
姚香平
XING Deke WU Yanyou WU Yansheng YU Rui LI Minghong YAO Xiangping(Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education/Institute of Agricultural Engineering, Jiangsu University, Zhenjiang,Jiangsu 212013, China Research center for Environmental Bio-Science and Technology, State Key Laboratory of Environmental Geochemistry/ Institute of Geochemistry, Chinese Academy of Sciences, Guiyang ,Guizhou 550002, China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2016年第6期649-656,共8页
Carsologica Sinica
基金
国家自然科学基金青年基金(31301243)
国家重点基础研究发展计划(973)项目专题(2013CB956701)
贵州省社会发展攻关项目(黔科合SY[2010]3043)
江苏大学引进人才科研启动基金(13JDG030)
关键词
光合作用
叶绿素荧光
水分利用效率
稳定碳同位素组成
胁迫
photosynthesis, chlorophyll fluorescence, water use efficiency, stable carbon isotopic composi- tion, stress
