摘要
【目的】研究秋华柳夏季水淹后整个生长期内不同阶段光合作用性能的变化,揭示秋华柳种群光合性能对水生态环境变化的适应机制,为该物种的保护和利用提供科学依据。【方法】以三峡大坝下游关洲岛的秋华柳(Salix variegata Franch)种群为实验材料,通过野外调查测定的方式,设定不同梯度测定时间:在出露初期(出露60 d内)每隔10 d以及整个生长期的前期、中期和后期(出露50、110和170 d),分别测定植株的光合作用性能,揭示人工调节河流对植物种群光合作用性能与植株生长的影响。【结果】在人工调节水位消涨格局下,秋华柳种群的光合作用性能在出露初期能快速恢复。植物的光合速率(P_(n))、气孔导度(G_(s))、蒸腾速率(T_(r))等均随着生长恢复进程显著上升,最大净光合速率(P_(n max))和表观量子效率(AQY)等光响应曲线特征值以及光合色素含量也相应快速增加。种群光合作用性能在整个生长期内以生长前期最高,其次分别为生长后期和中期,其中生长前期的净光合速率分别比生长中期和后期增加59.39%和30.77%。光响应曲线特征值以及光合色素含量的变化也呈相近的变化趋势。Pearson相关分析显示,秋华柳种群光合作用性能的相关参数均与土壤含水量呈显著相关,蒸腾速率和类胡萝卜素含量与水位呈显著相关。【结论】大型水利水电工程对河流水位消涨调节引起的生境地土壤含水量下降和出露时间减少,会对秋华柳种群的光合作用性能产生较为严重的影响,并进一步影响种群的生长。
【Objective】The present paper aimed to study the changes of photosynthetic performance at different stages during the whole growth period after summer flooding,and to reveal the adaptation mechanism of photosynthetic performance of the Salix variegata Franch populations to the changes of aquatic ecological environment,so as to provide scientific basis for the protection and utilization of this species.【Method】In the study,the S.variegata Franch populations in Guanzhou Island,downstream of the Three Gorges Dam,were used as the test materi-als.By using the method of field investigation and measurement,different gradient measurement times were set:at the initial stage of exposure(exposure for 60 days),every 10 days,and at the early,middle and late stages of the whole growth period(exposure for 50 days,110 days and 170 days),the photosynthetic performance of the plants were measured respectively,in order to reveal the effects of artificial regulation of rivers on the photosynthetic performance of plant populations and plant growth.【Result】The photosynthetic performance of the S.variegata populations recovered rapidly during the early exposing stage under the regulated water level fluctuation pattern.The photosynthetic rate(P_(n)),stomatal conductance(G_(s))and transpiration rate(T_(r))of plants increased significantly with the growth recovery process.The charac-teristic values of light response curves including the maximum net photosynthetic rate(P_(n max)),apparent quantum efficiency(AQY)and photosynthetic pigment content also increased rapidly.The photosynthetic performance of the populations ranked the highest at the early growth stage,followed by the late and middle growth stage in the whole growth period.The net photosynthetic rate increased by 59.39%and 30.77%compared with that of the middle and late growth stages,respectively.A similar trend of variation in the characteristic values of light response curve and photosynthetic pigment content was also observed.Pearson correlation analysis indicated th
作者
沈承叙
陈芳清
吴宇
吕坤
黄永文
SHEN Cheng-xu;CHEN Fang-qing;WU Yu;LYU Kun;HUANG Yong-wen(Hubei International Scientific and Technological Cooperation Center of Ecological Conservation and Management in Three Gorges Area,China Three Gorges University,Yichang,Hubei 443002,China;Hubei Zhengjiang Environmental Protection Technology Co.,Ltd.,Yichang,Hubei 443002,China)
出处
《西南农业学报》
CSCD
北大核心
2023年第2期272-284,共13页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目(31770564)。
关键词
秋华柳
光合作用性能
水位消涨
光响应曲线
土壤含水量
Salix variegata
Photosynthetic performance
Water-level fluctuation
Light response curve
Soil water content
