Spatiotemporal variation in forest net ecosystem productivity and its responses to climatic factors in the water source area of the Middle Route of the South-to-North Water Diversion Project

Chen Long; Fang Jing; Jiang Qinghu; Ren Boshen; Liu Feng

doi:10.11913/PSJ.2095-0837.24130

Plant Science Journal > 2025 > 43(2): 149-161. > DOI: 10.11913/PSJ.2095-0837.24130 CSTR: 32231.14.PSJ.2095-0837.24130

Chen L，Fang J，Jiang QH，Ren BS，Liu F. Spatiotemporal variation in forest net ecosystem productivity and its responses to climatic factors in the water source area of the Middle Route of the South-to-North Water Diversion Project[J]. Plant Science Journal，2025，43（2）：149−161. DOI: 10.11913/PSJ.2095-0837.24130

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Spatiotemporal variation in forest net ecosystem productivity and its responses to climatic factors in the water source area of the Middle Route of the South-to-North Water Diversion Project

Chen Long^{1, 2, 3,},
Fang Jing^{1, 2},
Jiang Qinghu^{1, 2},
Ren Boshen^{1, 2},
Liu Feng^{1, 2, ,}

1.
Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
2.
Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, Chinese Academy of Sciences & Hubei Province, Wuhan 430074, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

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Received Date: May 20, 2024
Accepted Date: July 01, 2024

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Abstract

Abstract

The carbon sequestration capacity of the water source area of the Middle Route of the South-to-North Water Diversion Project (hereinafter referred to as the water source area) is strongly influenced by climate variability. This study employed FORCCHN2, a second-generation individual-based forest ecosystem carbon cycling model, to estimate forest net ecosystem productivity (NEP) in the water source area from 2002 to 2020 and to assess its spatiotemporal dynamics and key driving factors. Results indicated that from 2002 to 2020, the average pixel-scale forest NEP ranged from 308.88 to 761.22 g C·m⁻²·a⁻¹, with radiation and temperature identified as primary determinants. Over this period, NEP exhibited a significant downward trend, decreasing at an average annual rate of 4.41 g C·m⁻²·a⁻¹, with spatial heterogeneity in this decline. Pixel-based correlation analysis of interannual variations in gross primary productivity (GPP), soil respiration (SR), and vegetation respiration (VR), along with their associations with climate factors, revealed that in the eastern region, rising temperatures led to a higher SR increase relative to GPP. Additionally, reductions in solar radiation in the northwest and southwest regions contributed to GPP decline in these areas.
- South-to-North Water Diversion Middle Route Project,
- Forest net ecosystem productivity,
- FORCCHN2,
- Climate change

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Spatiotemporal variation in forest net ecosystem productivity and its responses to climatic factors in the water source area of the Middle Route of the South-to-North Water Diversion Project

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