生态学报2017，Vol.37Issue(23)：7821-7832,12.DOI:10.5846/stxb201610021989
大气增温对滇西北高原典型湿地湖滨带优势植物的光和CO2利用能力的影响
Influence of simulated warming on light and CO2 utilization capacities of lakeside dominant plants in a typical plateau wetland in northwestern Yunnan
摘要
Abstract
The influence of air warming on the photosynthesis of wetland plants and the underlying mechanisms has recently been one of the important topics in ecological research.Using the open-top chambers (OTC),we studied the influence of experimental air warming on the light and CO2utilization capacities and photosynthetic rate of two dominant species (Zizania caduciflora and Sparganium stoloniferum) on the lakeside of Napahai plateau wetland in northwestern Yunnan.The results showed that (1) the effects of warming on light and CO2 utilization capacities were species-specific.For Z.caduciflora,air warming significantly decreased the light saturation point,light compensation point,light utilization range,CO2 saturation point,CO2 utilization range,and maximum net photosynthetic rate,but it increased the CO2 compensation point.In contrast,in S.stoloniferum,air warming significantly increased the light saturation point,light utilization range,and maximum net photosynthetic rate,but it decreased the light compensation point and weakly influenced the CO2 utilization parameters.(2) The effect of air warming on the light and CO2 utilization capacities of the two plant species showed seasonal variation.In Z.caduciflora,under the three temperature treatments,the light saturation point and light utilization range in October were significantly lower than those in June and August,and a seasonal decrease was observed in its maximum net photosynthetic rate.Contrarily,in S.stoloniferum,both the light and CO2 utilization parameters were not influenced by air warming,but its maximum net photosynthetic rate was higher in August than that in June and October.(3) All temperature parameters were negatively correlated with photosynthetic parameters in Z.caduciflora,whereas they were positively correlated in S.stoloniferum.The diurnal temperature was the major factor influencing the maximum net photosynthetic rate and light utilization range,while the mean and minimum temperatures mainly affected the CO2 utilization range.This study indicates that the lakeside dominant plants in northwestern Yunnan plateau show different adaptive strategies to air warming.In the context of continuous climate warming in northwestern Yunnan,the dominate status of Z.caduciflora might get weakened,while that of S.stoloniferum might get strengthened,and these changes,in turn,can induce alterations in vegetative components,structures,and functions of the whole ecosystem.关键词
滇西北高原/大气增温/湖滨带优势植物/光合作用Key words
Northwestern Yunnan Plateau/air warming/lakeside dominant plants/photosynthesis引用本文复制引用
刘振亚,张晓宁,李丽萍,王行,张贇,孙梅,肖德荣..大气增温对滇西北高原典型湿地湖滨带优势植物的光和CO2利用能力的影响[J].生态学报,2017,37(23):7821-7832,12.基金项目
国家自然科学基金(31370497,31500409) （31370497,31500409）
云南省高原湿地创新团队(2012HC007) （2012HC007）
