Arid
DOI10.5194/bg-15-115-2018
Modelling the diurnal and seasonal dynamics of soil CO2 exchange in a semiarid ecosystem with high plant-interspace heterogeneity
Gong, Jinnan1; Wang, Ben1,2; Jia, Xin1,2; Feng, Wei2; Zha, Tianshan2; Kellomaki, Seppo1; Peltola, Heli1
通讯作者Gong, Jinnan
来源期刊BIOGEOSCIENCES
ISSN1726-4170
EISSN1726-4189
出版年2018
卷号15期号:1页码:115-136
英文摘要

We used process-based modelling to investigate the roles of carbon-flux (C-flux) components and plant-interspace heterogeneities in regulating soil CO2 exchanges (F-S) in a dryland ecosystem with sparse vegetation. To simulate the diurnal and seasonal dynamics of F-S, the modelling considered simultaneously the CO2 production, transport and surface exchanges (e.g. biocrust photosynthesis, respiration and photodegradation). The model was parameterized and validated with multivariate data measured during the years 2013-2014 in a semiarid shrubland ecosystem in Yanchi, northwestern China. The model simulation showed that soil rewetting could enhance CO2 dissolution and delay the emission of CO2 produced from rooting zone. In addition, an ineligible fraction of respired CO2 might be removed from soil volumes under respiration chambers by lateral water flows and root uptakes. During rewetting, the lichen-crusted soil could shift temporally from net CO2 source to sink due to the activated photosynthesis of biocrust but the restricted CO2 emissions from subsoil. The presence of plant cover could decrease the root-zone CO2 production and biocrust C sequestration but increase the temperature sensitivities of these fluxes. On the other hand, the sensitivities of root-zone emissions to water content were lower under canopy, which may be due to the advection of water flows from the interspace to canopy. To conclude, the complexity and plant-interspace heterogeneities of soil C processes should be carefully considered to extrapolate findings from chamber to ecosystem scales and to predict the ecosystem responses to climate change and extreme climatic events. Our model can serve as a useful tool to simulate the soil CO2 efflux dynamics in dryland ecosystems.


类型Article
语种英语
国家Finland ; Peoples R China
收录类别SCI-E
WOS记录号WOS:000419710600001
WOS关键词LITTER DECOMPOSITION ; INTERANNUAL VARIABILITY ; TEMPERATURE SENSITIVITY ; TENGGER DESERT ; ALKALINE SOILS ; LONG-TERM ; CARBON ; RESPIRATION ; CRUSTS ; PRECIPITATION
WOS类目Ecology ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
来源机构北京林业大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208064
作者单位1.Univ Eastern Finland, Sch Forest Sci, POB 111, Joensuu 80101, Finland;
2.Beijing Forestry Univ, Sch Soil & Water Conservat, Yanchi Res Stn, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714
Gong, Jinnan,Wang, Ben,Jia, Xin,et al. Modelling the diurnal and seasonal dynamics of soil CO2 exchange in a semiarid ecosystem with high plant-interspace heterogeneity[J]. 北京林业大学,2018,15(1):115-136.
APA Gong, Jinnan.,Wang, Ben.,Jia, Xin.,Feng, Wei.,Zha, Tianshan.,...&Peltola, Heli.(2018).Modelling the diurnal and seasonal dynamics of soil CO2 exchange in a semiarid ecosystem with high plant-interspace heterogeneity.BIOGEOSCIENCES,15(1),115-136.
MLA Gong, Jinnan,et al."Modelling the diurnal and seasonal dynamics of soil CO2 exchange in a semiarid ecosystem with high plant-interspace heterogeneity".BIOGEOSCIENCES 15.1(2018):115-136.
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