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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (9): 2794-2804.doi: 10.13287/j.1001-9332.201709.039

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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.

CHEN Liang1, SUN Bao-yu2, HAN Guang-xuan2*, LIU Zi-ting1, HE Wen-jun2, WANG An-dong3, WU Li-xin3   

  1. 1College of Environment and Planning, Liaocheng University, Liaocheng 252059, Shandong, China;
    2Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, Shandong, China;
    3Administration Bureau of the Yellow River Delta National Nature Zone Reserve, Dongying 257500, Shandong, China.
  • Received:2017-01-22 Online:2017-09-18 Published:2017-09-18
  • Contact: * E-mail: gxhan@yic.ac.cn
  • Supported by:

    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).

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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 conduc-tance (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.