应用生态学报2017，Vol.28Issue(9)：2794-2804,11.DOI:10.13287/j.1001-9332.201709.039
降雨量增减对黄河三角洲滨海湿地土壤呼吸和芦苇光合特性的影响
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
摘要
Abstract
The coastal wetland has shallow underground water level and is affected by the fresh water and salt water in vertical direction.The changes in precipitation amount can alter the conditions of soil water and salt,thus affecting soil respiration and plant photosynthesis.In order to clarify the effect of the change in precipitation amount on soil respiration and photosynthetic characteristics,we used rainout shelters and rainwater pipes to manipulate precipitation amount in the coastal wetland in the Yellow River Delta.Soil respiration and photosynthetic light response curve of Phragmites australis were measured during the growing season in 2015.Moreover,environmental factors including soil temperature,soil water content and soil salt content were measured simultaneously.The results showed that the whole growing season could be divided into three periods,drought period,wet period and flooding period,according to soil moisture condition.The effect of precipitation change on soil respiration and photosynthetic characteristics of P.australis was controlled by soil moisture condition.During the drought period,increased precipitation increased soil respiration significantly by 31.8％ compared to the control.In addition,increased precipitation also increased stomatal conductance (gs) and photosynthetic capacity of plant leaf compared with those in the control,while decreased precipitation decreased soil respiration significantly by 41.1％ compared with that in control.Meanwhile,decreased precipitation decreased the stomata obstruction and photosynthetic capacity of P.australis.During the wet period,soil respiration and the temperature sensitive of soil respiration (Q10) decreased in both increased and decreased precipitation treatments.Increase and decrease in precipitation amount both had no significant effect on the light response curve of P.australis.During the flooding period,increase and decrease in precipitation amount both had no significant effect on soil respiration,however,they aggravated and reduced the flood damage in reed plants,respectively.The net photosynthetic rate of P.australis was from high to low as the decreased precipitation ＞CK ＞ increased precipitation.关键词
降雨变化/黄河三角洲/滨海湿地/土壤呼吸/光合作用Key words
change in precipitation amount/the Yellow River Delta/coastal wetland/soil respiration/photosynthesis引用本文复制引用
陈亮,孙宝玉,韩广轩,刘子亭,贺文君,王安东,吴立新..降雨量增减对黄河三角洲滨海湿地土壤呼吸和芦苇光合特性的影响[J].应用生态学报,2017,28(9):2794-2804,11.基金项目
国家自然科学基金项目(41671089)和中国科学院科技服务网络计划项目(KFJ-EW-STS-127)资助 （41671089）
This work was supported by the National Natural Science Foundation of China (41671089) and Science and the Technology Service Network Initiative of the Chinese Academy of Sciences (KFJ-EW-STS-127). （41671089）
