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Effects of change in precipitation amount on soil respiration and photosynthetic characteristics of Phragmites australis in a coastal wetland in the Yellow River Delta,China
Authors
刘子亭
吴立新
+5 more
孙宝玉
王安东
贺文君
陈亮
韩广轩
Publication date
1 January 2017
Publisher
Abstract
滨海湿地地下水位浅,淡咸水垂直交互作用明显,全球气候变化背景下降水变异改变其土壤表层水盐状况,从而影响植物光合作用与土壤呼吸.为探究降雨量变化对黄河三角洲滨海湿地土壤呼吸和光合特性的影响,采用固定式遮雨顶棚和雨水输送管道相结合的方法设置增减雨处理小区,于2015年生长季测定土壤呼吸和光合作用光响应曲线,同时连续测定土壤温度、土壤含水量、土壤含盐量等土壤环境因子.结果表明:根据土壤含水量波动情况可将生长季分为3个阶段:干旱期、湿润期、淹水期.不同土壤水分阶段,土壤呼吸和芦苇光合特性对降雨量增减的响应不同.在干旱期,增雨处理下土壤呼吸速率显著提高了31.8%,同时芦苇叶片气孔导度和光合能力显著增强;减雨处理下土壤呼吸速率降低41.1%,芦苇叶片气孔阻塞,光合能力降低.在湿润期,增雨和减雨处理使土壤呼吸速率及其温度敏感性指数(Q10)均出现下降,但二者未对芦苇各光合参数和净光合速率产生显著影响.在淹水期,增减雨处理未对土壤呼吸产生显著影响,但芦苇对淹水胁迫较为敏感,增减雨分别加重和降低了淹水对芦苇植株的伤害,光合速率由高到低为减雨>对照>增雨
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Institutional Repository of Yantai Institute of Coastal Zone Research, CAS
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oai:ir.yic.ac.cn:133337/26502
Last time updated on 24/06/2021
Institutional Repository of Yantai Institute of Coastal Zone Research, CAS
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:ir.yic.ac.cn:133337/24283
Last time updated on 16/09/2020