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• W3176767297 endingPage "148684" @default.
• W3176767297 startingPage "148684" @default.
• W3176767297 abstract "Soil respiration (RS) is affected by many factors and shows significant diurnal and seasonal changes at different spatial and temporal scales. However, in a semi-arid steppe, the mechanism of the dynamic influence of environmental factors on RS is not clear, and the effect of subtle changes of soil water on RS under drought stress is yet to be explored. Therefore, Xilin River Basin, was the study area and a hydrological gradient on the four ecosystems for RS and hydrometeorological monitoring was selected. We proposed the use of dynamic sunrise and sunset time to distinguish day from night and determine related statistics. Additionally, we analyzed the temporal variation of RS and its response process and mechanism for hydrometeorological factors during the growing season and at daily scales. Further, we quantitatively simulated the RS of 594 scenarios in different growing season stages, ecosystems, and precipitation patterns. Results showed that: (1) in the hydrological gradient belt, different ecosystems exhibited the same trend but different characteristics of RS regulation. From May to November 2020, RS was 2.34–3.89, 1.89–5.97, 1.90–5.27 and 2.29–3.45 gC m−2 day−1 for the four ecosystems. (2) The use of dynamic sunrise and sunset time to distinguish day and night can more accurately describe the statistical value of each variable, which exhibits remarkable feasibility in daily scale research. (3) The changes in RS were adequately explained by temperature at various time scales, and the photosynthetically active radiation was positively correlated with RS at the daily scale. The special soil water content (MS) condition in the study area was not sufficient to explain RS. (4) Precipitation can affect RS by changing soil and air; however, only when precipitation exceeds the effective precipitation threshold of 0.6 ± 0.3 mm, it significantly affects RS." @default.
• W3176767297 created "2021-07-05" @default.
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• W3176767297 date "2021-11-01" @default.
• W3176767297 modified "2023-10-15" @default.
• W3176767297 title "Hydrologic gradient changes of soil respiration in typical steppes of Eurasia" @default.
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• W3176767297 doi "https://doi.org/10.1016/j.scitotenv.2021.148684" @default.
• W3176767297 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34214805" @default.
• W3176767297 hasPublicationYear "2021" @default.
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