Asymmetric Impacts of Diurnal Warming on Vegetation Carbon Sequestration of Marshes in the Qinghai Tibet Plateau

Abstract

Wetlands are one of the three major ecosystems in the world. Wetlands account for only 4%-6% of the global area , but the wetland's carbon reserves account for 12%-24% of the total terrestrial carbon reserves in the world (Shukla et al., 2019). Marshes are the main type of wetland and marsh vegetation plays an important role in carbon sequestration in marsh ecosystems (Yuan & Yuan, 2017). Net primary productivity (NPP) is an important indicator of carbon sequestration capacity (Nayak et al., 2010;Pachavo & Murwira, 2014;Reyer et al., 2014) and is widely used to understand carbon storage in marsh ecosystems (Alongi, 2020;Mngadi et al., 2022;Zhang et al., 2014). Studies have shown that climate variation can change vegetation coverage,

Response of vegetation variation to climate change and human activities in semi-arid swamps

“…Wetlands are one of the most productive ecosystems in the world and have irreplaceable ecological value for the conservation of species and the maintenance of biodiversity ( Mas et al., 2021 ). As the core part of wetland ecosystems, wetland vegetation plays an important role in the balance of Earth’s ecosystem, climate change, the water cycle, and energy flow (e.g., Guntenspergen et al., 1989 ; Shen et al., 2021 ; Zhang et al., 2021 ; Shen et al., 2022c ; Yan et al., 2022 ). At the same time, vegetation is also a sensitive factor for ecological changes and is considered to be an important part of migratory waterfowl habitat, providing food, hiding places, and breeding sites for waterfowl, directly affecting their living environment ( Barchiesi et al., 2022 ; Wang et al., 2022c ; Yuan et al., 2022 ).…”

Interannual characteristics and driving mechanism of CO2 fluxes during the growing season in an alpine wetland ecosystem at the southern foot of the Qilian Mountains

“…The carbon process of the alpine grassland ecosystem is extremely sensitive to and complex in the face of continuous global warming ( Shen et al., 2015 ; Wang et al., 2017 ). Because the soil of the alpine ecosystem contains a substantial amount of thatch, or undecomposed organic matter, it is particularly vulnerable to changes in the global climate ( Shen et al., 2022 ). Although high-altitude grassland ecosystems have attracted more attention recently, studies on carbon processes based on long-term data have still been lacking ( Li et al., 2021 ).…”

“…The unique environmental conditions in the alpine grassland, namely, its high altitude, low temperature, and strong radiation, aid in the carbon fixation of vegetation, whereby vegetation converts inorganic carbon into organic compounds ( Shen et al., 2022 ). However, the differences between biotic and abiotic factors still significantly impacted carbon source/sink dynamics, which will increase the uncertainty of predicting the carbon balance dynamics of the alpine grassland under the background of climate change in the future ( Chai et al., 2017 ).…”

“…Studies have shown that CO 2 fluxes in alpine ecosystems are mainly controlled by the dynamics of carbon balance in the growing season ( Chai et al., 2017 ; Chai et al., 2019 ). In the context of global climate change, the rise of temperature is expected to promote snow melt and vegetation greening earlier, thus prolonging the length of the growing season ( Groendahl et al., 2007 ; Street et al., 2007 ; Shen et al., 2022 ). Wetland ecosystems are fragile and play an important role in the carbon cycle of global terrestrial ecosystems ( Temmink et al., 2022 ; Zhang et al., 2022 ).…”

“…The wetland in QTP occupies 33% of China’s wetland area ( Zheng et al., 2013 ; Kang et al., 2022 ). Furthermore, permafrost thawing and glacier retreat may create larger or new wetlands on the QTP ( Kang et al., 2014 ; Shen et al., 2022 ). Climatic and environmental factors at different time scales may have different impacts on the carbon cycle ( Saito et al., 2009 ; Zhu et al., 2015 ; Zhu et al., 2020 ).…”