盐城海滨湿地不同盐沼土壤呼吸特征及温度响应

doi:10.11934/j.issn.1673-4831.2017.08.006

摘要/Abstract

摘要：

测定了盐城海滨湿地芦苇（Phragmites australis）盐沼、互花米草（Spartina alterniflora）盐沼和碱蓬（Suaeda salsa）盐沼土壤呼吸速率，结合盐沼土壤室内培养实验，比较3种盐沼土壤呼吸特征及温度响应。结果表明：（1）实验期内3种盐沼土壤呼吸均为CO₂排放状态，芦苇盐沼、互花米草盐沼和碱蓬盐沼土壤呼吸速率平均值分别为323.67、499.51和150.41 mg·m^-2·h^-1。3种盐沼土壤呼吸均呈现明显的季节性差异，由高到低依次为夏季、春季和秋季。（2）野外实验中，3种盐沼土壤呼吸出现峰值时的土壤温度由高到低依次为芦苇盐沼（28℃）、互花米草盐沼（22℃）和碱蓬盐沼（20℃）。室内培养条件下，土壤呼吸速率与土壤温度呈显著正相关（P＜0.05），对温度变化的敏感性由大到小依次为芦苇盐沼（2.19）、碱蓬盐沼（2.15）和互花米草盐沼（1.58）。（3）实验期内3种盐沼土壤呼吸累积排放量由大到小依次为互花米草盐沼（3 400 g·m^-2·a^-1）、芦苇盐沼（2 330 g·m^-2·a^-1）和碱蓬盐沼（1 082 g·m^-2·a^-1），不同季节累积排放量由大到小依次均为夏季、春季和秋季。

关键词: 海滨湿地, 互花米草, 土壤呼吸, 温度敏感性

Abstract:

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^-1in 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

中图分类号:

Q148

徐杰, 苏海蓉, 余培培, 王国祥, 刘金娥. 盐城海滨湿地不同盐沼土壤呼吸特征及温度响应[J]. 生态与农村环境学报, 2017, 33(8): 715-721.

XU Jie, SU Hai-rong, YU Pei-pei, WANG Guo-xiang, LIU Jin-e. Respirations and Response in Temperature of Salt Marsh Soil in Different Types of Wetlands Along the Coast of Yancheng[J]. Journal of Ecology and Rural Environment, 2017, 33(8): 715-721.

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