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[1]ZHOU Zhiyun,CUI Boliang,CHEN Kelong,et al.Effects of Simulated Changes in Precipitation on Soil Respiration in Alpine Lakeshore Wetlands[J].Research of Soil and Water Conservation,2023,30(05):130-137.[doi:10.13869/j.cnki.rswc.2023.05.033.]

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Effects of Simulated Changes in Precipitation on Soil Respiration in Alpine Lakeshore Wetlands

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 05 Page number: 130-137 Column: Public date: 2023-08-10

Title:: Effects of Simulated Changes in Precipitation on Soil Respiration in Alpine Lakeshore Wetlands

Author(s):: ZHOU Zhiyun^1,2,3, CUI Boliang^2,3, CHEN Kelong^2,3,4, DU Yangong¹; (1.Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining 810008, China; 2.Key Laboratory of Qinghai-Tibet Plateau Surface Process and Ecological Conservation, Qinghai Normal University, Xining 810008, China; 3.Qinghai Lake Wetland Ecosystem National Positioning Observation and Research Station, Haibei, Qinghai 812200, China; 4.Academy of Plateau Science and Sustainability, Xining 810008, China)

Keywords:: precipitation treatment; soil respiration; highland wetlands; vegetation biomass; Qinghai Lake Bird Islands

CLC:: P463.23

DOI:: 10.13869/j.cnki.rswc.2023.05.033.

Abstract:: [Objective] This study aims to investigate the effects of precipitation changes on soil respiration rate in alpine lakeshore wetlands of Qinghai Lake, to elucidate the main controlling factors driving the changes of soil respiration rate, and to provide technical support for the changes of carbon pool in alpine wetland ecosystem and regional carbon budget. [Methods] Nine plots with projection area of 3 m×3 m were established in the alpine lakeshore wetland of Bird Island, located on the west bank of Qinghai Lake, and the intensity and process of rainfall variation on soil respiration rate in the wetland were analyzed by in situ water reduction of 50%, natural control and water increase of 50% experimental treatments. [Results] The simulated rainfall reduction and rainfall increase treatments induced the increase in soil temperature by 0.79 and 0.68℃, respectively, compared with the control. Rainfall reduction significantly increased the below-ground root biomass of wetland vegetation, and rainfall increase significantly increased soil water content by 10.3% and 13.2%, respectively(p<0.05). Both rainfall increase and rainfall reduction treatments reduced soil respiration rate, and the inhibition effect was more pronounced in the rainfall increase treatment. Precipitation changes under different treatments in 2020 did not have significant effects on soil respiration rate. Soil respiration rate under rainfall reduction treatment was positively correlated with 0—10 cm soil temperature, moisture, pH, total soil nitrogen and below-ground biomass in quadratic terms and negatively correlated with total soil carbon in quadratic terms; soil respiration under rainfall increase treatment was negatively correlated with 0—10 cm soil moisture, pH and below-ground biomass in quadratic terms and positively correlated with 0—10 cm soil temperature, total soil carbon and total nitrogen in quadratic terms. [Conclusion] Altered precipitation patterns reduced soil respiration rates in Bird Island Wetlands of Qinghai Lake, and the rates were influenced by multiple factors, with soil temperature contributing the most.

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Last Update: 2023-08-10