Cooperation of Photosynthetic and Nitrogen Metabolism

Иванов, А. А.; Kosobryukhov, A. A.

doi:10.1002/9781119510390.ch9

Cited by 1 publication

(1 citation statement)

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“…Although the influence of available nitrogen on ecosystem carbon accumulation is unclear, studies have demonstrated that increased nitrogen availability can lead to a rise in soil microbial activity, thereby increasing Rh and the amount of carbon released by the soil into the atmosphere (Allison et al, 2008;Ma et al, 2018). In addition, available nitrogen also promotes photosynthesis and enhances the carbon absorption of ecosystems (Ivanov et al, 2018). With the co-action of climate change, natural disturbances, and anthropogenic disturbances, uncertainties in the carbon sequestration potential of tem-perate wetlands may influence our predictions of future climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the carbon sequestration of Zhalong Wetland under climate change

Dan

Hong-yan

2021

J. Geogr. Sci.

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Wetland ecosystems are crucial to the global carbon cycle. In this study, the Zhalong Wetland was investigated. Based on remote sensing and meteorological observation data from 1975-2018 and the downscaled fifth phase of the coupled model intercomparison project (CMIP5) climate projection dataset from 1961-2100, the parameters of a net primary productivity (NPP) climatic potential productivity model were adjusted, and the simulation ability of the CMIP5 coupled models was evaluated. On this basis, we analysed the spatial and temporal variations of land cover types and landscape transformation processes in the Zhalong Nature Reserve over the past 44 years. We also evaluated the influence of climate change on the NPP of the vegetation, microbial heterotrophic respiration (Rh), and net ecosystem productivity (NEP) of the Zhalong Wetland and predicted the carbon sequestration potential of the Zhalong Wetland from 2019-2029 under the representative concentration pathways (RCP) 4.5 and RCP 8.5 scenarios. Our results indicate the following: (1) Herbaceous bog was the primary land cover type of the Zhalong Nature Reserve, occupying an average area of 1168.02 ± 224.05 km 2 , equivalent to 51.84% of the total reserve area. (2) Since 1975, the Zhalong Nature Reserve has undergone a dry-wet-dry transformation process. Excluding several wet periods during the mid-1980s to early 1990s, the reserve has remained a dry habitat, with particularly severe conditions from 2000 onwards. (3) The 1975-2018 mean NPP, Rh, and NEP values of the Zhalong Wetland were 500.21±52.76, 337.59±10.80, and 162.62±45.56 gC•m −2 •a −1 , respectively, and an evaluation of the carbon balance indicated that the reserve served as a carbon sink. (4) From 1975-2018, NPP showed a significant linear increase, Rh showed a highly significant linear increase, while the increase in the carbon absorption rate was smaller than the increase in the carbon release rate. (5) Variations in NPP and NEP were precipitation-driven, with the correlations of NPP and NEP with annual precipitation and summer precipitation being highly significantly positive (P < 0.001); variations in Rh were temperature-driven, with the correlations of Rh with the average annual, summer, and autumn temperatures being highly significantly positive (P < 0.001). The interaction of precipitation and temperature enhances the impact on NPP, Rh and NEP. (6) Under the RCP 4.5 and RCP 8.5 scenarios, the predicted carbon sequestration by the Zhalong Wetland from 2019-2029 was 2.421 (± 0.225) × 10 11 gC•a −1 and 2.407 (± 0.382)

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Section: Introductionmentioning

confidence: 99%