Coupling Relationships Between Alpine Wetland Ecosystem CO2 and Vapor Fluxes around the Qinghai Lake

doi:10.7522/j.issn.1000-694X.2016.00029

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (5): 1286-1295.DOI: 10.7522/j.issn.1000-694X.2016.00029

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Coupling Relationships Between Alpine Wetland Ecosystem CO₂ and Vapor Fluxes around the Qinghai Lake

Cao Shengkui^1,2, Cao Guangchao¹, Chen Kelong¹, Feng Qi^1,2, Li Zhongqing², Zhang Jing¹, Han Gaungzhao¹, Lin Yangyang¹

1. College of Life and Geographical Science/Qinghai Province Key Laboratory of Physical Geography and Environmental Process, Qinghai Normal University, Xining 810008, China;
2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2015-12-23 Revised:2016-03-07 Online:2016-09-20 Published:2016-09-20

Abstract

Abstract: This paper studied the coupling relationships between alpine wetland ecosystem CO₂ fluxes and vapor fluxes on the different time scales with the eddy covariance techniques in Qinghai Lake. Results showed that alpine wetland ecosystem half-hour CO₂ fluxes and vapor fluxes in Qinghai Lake existed in extreme significant negative relationships (P<0.0001), as well as extreme significant and positive linear relationships between half-hour gross ecosystem productivities (GEPs) and vapor fluxes, which the ratio of vapor fluxes participating in ecosystem net CO₂ exchanges (NEE) and ecosystem total carbon absorption in the cloudy days was highest. The alpine wetland ecosystem monthly average half-hour NEEs and vapor fluxes showed an extreme significant negative relationship (R²=0.71,P<0.0001). From vegetation green up stage, growing stage to wilt stage, monthly average half-hour GEPs and vapor fluxes not only showed extreme significant positive linear relationship(P<0.0001), but also a quadratic polynomial one(P<0.0001) at growing stage and withering stage. On the daily scale, the alpine wetland ecosystem daily total NEE and evapotranspiration in Qinghai Lake existed in an extreme significant negative a quadratic polynomial nonlinear relationship (R²=0.58,P<0.0001). The alpine wetland ecosystem daily total GEP and evapotranspiration showed an extreme significant positive exponential correlation (R²=0.42,P<0.0001). On the monthly scale, the alpine wetland ecosystem monthly total NEE and evapotranspiration in Qinghai Lake showed an extreme significant negative linear relationship (R²=0.60,P<0.0001), as well as a quadratic polynomial nonlinear negative relationship (R²=0.63,P<0.0001). The alpine wetland ecosystem monthly total GEPs and evapotranspiration showed an extreme significant positive linear correlation (R²=0.51,P<0.0001) as well as a positive exponential relationship (R²=0.64,P<0.0001).

Key words: ecosystem net CO₂ exchange, gross ecosystem productivity(GEP), vapor flux, coupling relationships, alpine wetland, Qinghai Lake

CLC Number:

Q148

Cao Shengkui, Cao Guangchao, Chen Kelong, Feng Qi, Li Zhongqing, Zhang Jing, Han Gaungzhao, Lin Yangyang. Coupling Relationships Between Alpine Wetland Ecosystem CO₂ and Vapor Fluxes around the Qinghai Lake[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(5): 1286-1295.

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Coupling Relationships Between Alpine Wetland Ecosystem CO₂ and Vapor Fluxes around the Qinghai Lake

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