Journal of Ecology and Rural Environment ›› 2017, Vol. 33 ›› Issue (8): 715-721.doi: 10.11934/j.issn.1673-4831.2017.08.006

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Respirations and Response in Temperature of Salt Marsh Soil in Different Types of Wetlands Along the Coast of Yancheng

XU Jie, SU Hai-rong, YU Pei-pei, WANG Guo-xiang, LIU Jin-e   

  1. School of Environment, Nanjing Normal University/Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
  • Received:2016-11-25 Online:2017-08-25 Published:2017-09-25


Soil respiration rates (SRR) of the salt marsh soils in the wetlands under different types of vegetation, i.e. Phragmites australis (PHS), Spartina alterniflora (SPS) and Suaeda salsa (SUS) along the coast of Yancheng were determined separately in the field and soil samples collected for laboratory incubation and measurement of respiration rates at specific temperatures, and further for analyses of soil responses to changing temperature in respiration. Results show that:(1) during the experiment period, the salt marsh soils were sources of CO2. The mean SRR under PHS, SPS and SUS was 323.67, 499.51 and 150.41 mg·m-2·h-1, respectively. The SRRs followed a seasonal rhythm of summer > spring > autumn. (2) In the field experiments it was found that SSR peaked at times when the soil temperature reached 28, 22 and 20℃ in the soil under PHS, SPS and SUS, respectively. In the laboratory incubation experiment, it was found that SRR was significantly and positively related to soil temperature (P<0.05), and the three types of soils displayed an order of PHS (2.19)>SUS (2.15)>SPS (1.58) in sensitivity of SRR responding to changing environmental temperature (Q10 value). (3) During the experiment period, cumulated field SRR was estimated at 3 400 g·m-2·a-1 in SPS, 2 330 g·m-2·a-1 in PHS and 1 082 g·m-2·a-1 in SUS, and followed a seasonal rhythm of summer > spring > autumn.

Key words: coastal wetland, Spartina alterniflora, soil respiration, temperature sensitivity

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