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Article: Grassland productivity and carbon sequestration in Mongolian grasslands: The underlying mechanisms and nomadic implications

TitleGrassland productivity and carbon sequestration in Mongolian grasslands: The underlying mechanisms and nomadic implications
Authors
KeywordsEddy-covariance
Global warming
Carbon emission
Global change
Ecosystem function
Issue Date2017
Citation
Environmental Research, 2017, v. 159, p. 124-134 How to Cite?
Abstract© 2017 Elsevier Inc. Background Quantifying carbon (C) dioxide exchanges between ecosystems and the atmosphere and the underlying mechanism of biophysical regulations under similar environmental conditions is critical for an accurate understanding of C budgets and ecosystem functions. Methods For the first time, a cluster of four eddy covariance towers were set up to answer how C fluxes shift among four dominant ecosystems in Mongolia – meadow steppe (MDW), typical steppe (TPL), dry typical steppe (DRT) and shrubland (SHB) during two growing seasons (2014 and 2015). Results Large variations were observed for the annual net ecosystem exchange (NEE) from 59 to 193 g C m − 2 , though all four sites acted as a C source. During the two growing seasons, MDW acted as a C sink, TPL and DRT were C neutral, while SHB acted as a C source. MDW to SHB and TPL conversions resulted in a 2.6- and 2.2-fold increase in C release, respectively, whereas the TPL to SHB conversion resulted in a 1.1-fold increase at the annual scale. C assimilation was higher at MDW than those at the other three ecosystems due to its greater C assimilation ability and longer C assimilation times during the day and growing period. On the other hand, C release was highest at SHB due to significantly lower photosynthetic production and relatively higher ecosystem respiration (ER). A stepwise multiple regression analysis showed that the seasonal variations in NEE, ER and gross ecosystem production (GEP) were controlled by air temperature at MDW, while they were controlled mainly by soil moisture at TPL, DRT and SHB. When air temperature increased, the NEE at MDW and TPL changed more dramatically than at DRT and SHB, suggesting not only a stronger C release ability but also a higher temperature sensitivity at MDW and TPL. Conclusions The ongoing and predicted global changes in Mongolia likely impact the C exchange at MDW and TPL more than at DRT and SHB in Mongolia. Our results suggest that, with increasing drought and vegetation type succession, a clear trend for greater CO 2 emissions may result in further global warming in the future. This study implies that diverse grassland ecosystems will respond differently to climate change in the future and can be seen as nature-based solutions (NBS) supporting climate change adaptation and mitigation strategies.
Persistent Identifierhttp://hdl.handle.net/10722/251233
ISSN
2023 Impact Factor: 7.7
2023 SCImago Journal Rankings: 1.679
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorShao, Changliang-
dc.contributor.authorChen, Jiquan-
dc.contributor.authorChu, Housen-
dc.contributor.authorLafortezza, Raffaele-
dc.contributor.authorDong, Gang-
dc.contributor.authorAbraha, Michael-
dc.contributor.authorBatkhishig, Ochirbat-
dc.contributor.authorJohn, Ranjeet-
dc.contributor.authorOuyang, Zutao-
dc.contributor.authorZhang, Yaoqi-
dc.contributor.authorQi, Jiaguo-
dc.date.accessioned2018-02-01T01:54:58Z-
dc.date.available2018-02-01T01:54:58Z-
dc.date.issued2017-
dc.identifier.citationEnvironmental Research, 2017, v. 159, p. 124-134-
dc.identifier.issn0013-9351-
dc.identifier.urihttp://hdl.handle.net/10722/251233-
dc.description.abstract© 2017 Elsevier Inc. Background Quantifying carbon (C) dioxide exchanges between ecosystems and the atmosphere and the underlying mechanism of biophysical regulations under similar environmental conditions is critical for an accurate understanding of C budgets and ecosystem functions. Methods For the first time, a cluster of four eddy covariance towers were set up to answer how C fluxes shift among four dominant ecosystems in Mongolia – meadow steppe (MDW), typical steppe (TPL), dry typical steppe (DRT) and shrubland (SHB) during two growing seasons (2014 and 2015). Results Large variations were observed for the annual net ecosystem exchange (NEE) from 59 to 193 g C m − 2 , though all four sites acted as a C source. During the two growing seasons, MDW acted as a C sink, TPL and DRT were C neutral, while SHB acted as a C source. MDW to SHB and TPL conversions resulted in a 2.6- and 2.2-fold increase in C release, respectively, whereas the TPL to SHB conversion resulted in a 1.1-fold increase at the annual scale. C assimilation was higher at MDW than those at the other three ecosystems due to its greater C assimilation ability and longer C assimilation times during the day and growing period. On the other hand, C release was highest at SHB due to significantly lower photosynthetic production and relatively higher ecosystem respiration (ER). A stepwise multiple regression analysis showed that the seasonal variations in NEE, ER and gross ecosystem production (GEP) were controlled by air temperature at MDW, while they were controlled mainly by soil moisture at TPL, DRT and SHB. When air temperature increased, the NEE at MDW and TPL changed more dramatically than at DRT and SHB, suggesting not only a stronger C release ability but also a higher temperature sensitivity at MDW and TPL. Conclusions The ongoing and predicted global changes in Mongolia likely impact the C exchange at MDW and TPL more than at DRT and SHB in Mongolia. Our results suggest that, with increasing drought and vegetation type succession, a clear trend for greater CO 2 emissions may result in further global warming in the future. This study implies that diverse grassland ecosystems will respond differently to climate change in the future and can be seen as nature-based solutions (NBS) supporting climate change adaptation and mitigation strategies.-
dc.languageeng-
dc.relation.ispartofEnvironmental Research-
dc.subjectEddy-covariance-
dc.subjectGlobal warming-
dc.subjectCarbon emission-
dc.subjectGlobal change-
dc.subjectEcosystem function-
dc.titleGrassland productivity and carbon sequestration in Mongolian grasslands: The underlying mechanisms and nomadic implications-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.envres.2017.08.001-
dc.identifier.pmid28797887-
dc.identifier.scopuseid_2-s2.0-85026829878-
dc.identifier.volume159-
dc.identifier.spage124-
dc.identifier.epage134-
dc.identifier.eissn1096-0953-
dc.identifier.isiWOS:000413280500015-
dc.identifier.issnl0013-9351-

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