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Updated: May 22, 2026

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
[Spatial-temporal Evolution of Carbon Source/Sink and its Influencing Factors in Chongqing Functional Area]
Hui Li1, Xing-Ping Wei1,2
1College of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China.
Abstract:
As an important ecological barrier of the Yangtze River, Chongqing's spatio-temporal evolution and driving mechanism of net ecosystem productivity (NEP) are of great significance for regional ecological protection and sustainable development. Using the CASA model and soil microbial respiration model, combined with multi-source data such as climate data, vegetation data, and social data, the regional net ecosystem productivity of Chongqing from 2000 to 2020 was estimated. Trend analysis, hotspot analysis, Hurst index, geographical detector, and spatio-temporal geographically weighted regression model were used to analyze the spatio-temporal variation characteristics of NEP and the mechanism of influencing factors. The results showed that: ① The mean value of NEP (C) in Chongqing from 2000 to 2020 was 578.68 g·(m2·a)-1. The urban development area and the urban functional area were the low value area and the cold spot area of NEP, respectively, and the northeast area and the southeast area of Chongqing were the high value area and the hot spot area of NEP. ② The overall change rate of the study area was 5.66 g·(m2·a)-1. The NEP of Chongqing and more than 86.52% of the functional areas showed an increasing trend, but there was a possibility of decreasing NEP in the future. ③ The explanatory power of elevation, temperature, precipitation, and land use type on NEP was strong, and the explanatory power of each factor interaction was improved. The influencing factors of each functional area had spatial and temporal heterogeneity. The urban development area, urban functional area, and northeastern Chongqing were mainly affected by the positive effects of elevation, temperature, and precipitation. The southeast of Chongqing was mainly affected by the negative effects of elevation and temperature. The research results will provide a scientific basis for the sustainable development of each functional area, regional ecological protection, and the realization of the "double carbon target."
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