Modelling of the Spatial and Temporal Variation of Soil Respiration in China from 1961 TO 2014
Abstract
Soil respiration (Rs) plays an important role in terrestrial-atmospheric carbon exchange, but remains the least-studied component of the ecosystem carbon cycle in China. We examined the spatial trends of soil respiration using 110 Rs sites throughout China, from 1992 to 2013. Surface and regression analyses indicated that the spatial patterns in Rs were because of complex effects of environmental conditions. We developed biome specific Rs models for China that were parameterised based on 2862 Rs records. The annual mean Rs rate and corresponding spatial distribution in China were evaluated based on the developed Rs models. These models explain more than 50% of the Rs variability for biome, except the barren or sparsely vegetated areas (BSV, R2adj = 41.38%). The estimated annual Rs rate in China increased at a rate of 0.005 Pg C yr-1, and the overall annual mean Rs from 1961 to 2014 is 4.01 Pg C year-1. Rs in China exhibited a clear spatial variation among different biome, with grasslands and mixed forests contributing the most to the total Rs rate. The combined contribution of the eight remaining biome was 0.39 Pg C year-1, which represented approximately 10% of the total Rs in China. Our Chinese Rs model provides a benchmark for Chinese carbon inventory assessment, further improving the understanding of regional scale soil carbon dynamics and assisting in evaluating the role of soil as a carbon sink or source under conditions resulting from global warming.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.B23G2598Y
- Keywords:
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- 0414 Biogeochemical cycles;
- processes;
- and modeling;
- BIOGEOSCIENCESDE: 0428 Carbon cycling;
- BIOGEOSCIENCESDE: 0486 Soils/pedology;
- BIOGEOSCIENCESDE: 1630 Impacts of global change;
- GLOBAL CHANGE