Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert Ecosystem
Desert ecosystem CO<sub>2</sub> exchange may play an important role in global carbon cycling. However, it is still not clear how the CO<sub>2</sub> fluxes of shrub-dominated desert ecosystems respond to precipitation changes. We performed a 10-year long-term rain addition exp...
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MDPI AG
2023-03-01
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| Online Access: | https://www.mdpi.com/2223-7747/12/5/1158 |
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| author | Xiaotian Xu Bo Wu Fang Bao Ying Gao Xinle Li Yanli Cao Qi Lu Junliang Gao Zhiming Xin Minghu Liu |
| author_facet | Xiaotian Xu Bo Wu Fang Bao Ying Gao Xinle Li Yanli Cao Qi Lu Junliang Gao Zhiming Xin Minghu Liu |
| author_sort | Xiaotian Xu |
| collection | DOAJ |
| description | Desert ecosystem CO<sub>2</sub> exchange may play an important role in global carbon cycling. However, it is still not clear how the CO<sub>2</sub> fluxes of shrub-dominated desert ecosystems respond to precipitation changes. We performed a 10-year long-term rain addition experiment in a <i>Nitraria tangutorum</i> desert ecosystem in northwestern China. In the growing seasons of 2016 and 2017, with three rain addition treatments (natural precipitation +0%, +50%, and +100% of annual average precipitation), gross ecosystem photosynthesis (GEP), ecosystem respiration (ER), and net ecosystem CO<sub>2</sub> exchange (NEE) were measured. The GEP responded nonlinearly and the ER linearly to rain addition. The NEE presented a nonlinear response along the rain addition gradient, with a saturation threshold by rain addition between +50% and +100%. The growing season mean NEE ranged from −2.25 to −5.38 μmol CO<sub>2</sub> m<sup>−2</sup> s<sup>−1</sup>, showing net CO<sub>2</sub> uptake effect, with significant enhancement (more negative) under the rain addition treatments. Although natural rainfall fluctuated greatly in the growing seasons of 2016 and 2017, reaching 134.8% and 44.0% of the historical average, the NEE values remained stable. Our findings highlight that growing season CO<sub>2</sub> sequestration in desert ecosystems will increase against the background of increasing precipitation levels. The different responses of GEP and ER of desert ecosystems under changing precipitation regimes should be considered in global change models. |
| first_indexed | 2024-03-11T07:13:20Z |
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| last_indexed | 2024-03-11T07:13:20Z |
| publishDate | 2023-03-01 |
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| series | Plants |
| spelling | doaj.art-26035ceb324a43d6978d3a907c7d213a2023-11-17T08:24:56ZengMDPI AGPlants2223-77472023-03-01125115810.3390/plants12051158Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert EcosystemXiaotian Xu0Bo Wu1Fang Bao2Ying Gao3Xinle Li4Yanli Cao5Qi Lu6Junliang Gao7Zhiming Xin8Minghu Liu9Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaInstitute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaInstitute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaInstitute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaThe Experimental Center of Desert Forestry of the Chinese Academy of Forestry, Bayannur 015200, ChinaInstitute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaInstitute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaThe Experimental Center of Desert Forestry of the Chinese Academy of Forestry, Bayannur 015200, ChinaThe Experimental Center of Desert Forestry of the Chinese Academy of Forestry, Bayannur 015200, ChinaThe Experimental Center of Desert Forestry of the Chinese Academy of Forestry, Bayannur 015200, ChinaDesert ecosystem CO<sub>2</sub> exchange may play an important role in global carbon cycling. However, it is still not clear how the CO<sub>2</sub> fluxes of shrub-dominated desert ecosystems respond to precipitation changes. We performed a 10-year long-term rain addition experiment in a <i>Nitraria tangutorum</i> desert ecosystem in northwestern China. In the growing seasons of 2016 and 2017, with three rain addition treatments (natural precipitation +0%, +50%, and +100% of annual average precipitation), gross ecosystem photosynthesis (GEP), ecosystem respiration (ER), and net ecosystem CO<sub>2</sub> exchange (NEE) were measured. The GEP responded nonlinearly and the ER linearly to rain addition. The NEE presented a nonlinear response along the rain addition gradient, with a saturation threshold by rain addition between +50% and +100%. The growing season mean NEE ranged from −2.25 to −5.38 μmol CO<sub>2</sub> m<sup>−2</sup> s<sup>−1</sup>, showing net CO<sub>2</sub> uptake effect, with significant enhancement (more negative) under the rain addition treatments. Although natural rainfall fluctuated greatly in the growing seasons of 2016 and 2017, reaching 134.8% and 44.0% of the historical average, the NEE values remained stable. Our findings highlight that growing season CO<sub>2</sub> sequestration in desert ecosystems will increase against the background of increasing precipitation levels. The different responses of GEP and ER of desert ecosystems under changing precipitation regimes should be considered in global change models.https://www.mdpi.com/2223-7747/12/5/1158desert ecosystemrain additionCO<sub>2</sub> fluxesCO<sub>2</sub> sinknonlinear response |
| spellingShingle | Xiaotian Xu Bo Wu Fang Bao Ying Gao Xinle Li Yanli Cao Qi Lu Junliang Gao Zhiming Xin Minghu Liu Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert Ecosystem Plants desert ecosystem rain addition CO<sub>2</sub> fluxes CO<sub>2</sub> sink nonlinear response |
| title | Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert Ecosystem |
| title_full | Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert Ecosystem |
| title_fullStr | Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert Ecosystem |
| title_full_unstemmed | Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert Ecosystem |
| title_short | Different Responses of Growing Season Ecosystem CO<sub>2</sub> Fluxes to Rain Addition in a Desert Ecosystem |
| title_sort | different responses of growing season ecosystem co sub 2 sub fluxes to rain addition in a desert ecosystem |
| topic | desert ecosystem rain addition CO<sub>2</sub> fluxes CO<sub>2</sub> sink nonlinear response |
| url | https://www.mdpi.com/2223-7747/12/5/1158 |
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