In:
Earth System Dynamics, Copernicus GmbH, Vol. 11, No. 1 ( 2020-03-09), p. 235-249
Abstract:
Abstract. Climate change, rising CO2 concentration, and land
use and land cover change (LULCC) are primary driving forces for terrestrial
gross primary productivity (GPP), but their impacts on the temporal changes
in GPP are uncertain. In this study, the effects of the three main factors
on the interannual variation (IAV) and seasonal cycle amplitude (SCA) of GPP
in China were investigated using 12 terrestrial biosphere models from the
Multi-scale Synthesis and Terrestrial Model Intercomparison Project. The
simulated ensemble mean value of China's GPP between 1981 and 2010, driven
by common climate forcing, LULCC and CO2 data, was found to be
7.4±1.8 Pg C yr−1. In general, climate was the dominant control
factor of the annual trends, IAV and seasonality of China's GPP. The
overall rising CO2 led to enhanced plant photosynthesis, thus
increasing annual mean and IAV of China's total GPP, especially in
northeastern and southern China, where vegetation is dense. LULCC decreased
the IAV of China's total GPP by ∼7 %, whereas rising
CO2 induced an increase of 8 %. Compared to climate change and
elevated CO2, LULCC showed less contributions to GPP's temporal
variation, and its impact acted locally, mainly in southwestern China.
Furthermore, this study also examined subregional contributions to the
temporal changes in China's total GPP. Southern and southeastern China
showed higher contributions to China's annual GPP, whereas southwestern and
central parts of China explained larger fractions of the IAV in China's GPP.
Type of Medium:
Online Resource
ISSN:
2190-4987
DOI:
10.5194/esd-11-235-2020
DOI:
10.5194/esd-11-235-2020-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2020
detail.hit.zdb_id:
2578793-7
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