Response of carbon uptake to abiotic and biotic drivers in an intensively managed Lei bamboo forest

Yuli Liu; Guomo Zhou; Huaqiang Du; Frank Berninger; Fangjie Mao; Xuejian Li; Liang Chen; Lu Cui; Yangguang Li; Di'en Zhu; Lin Xu

doi:10.1016/j.jenvman.2018.06.046

Response of carbon uptake to abiotic and biotic drivers in an intensively managed Lei bamboo forest

J Environ Manage. 2018 Oct 1:223:713-722. doi: 10.1016/j.jenvman.2018.06.046. Epub 2018 Jul 3.

Authors

Yuli Liu¹, Guomo Zhou², Huaqiang Du³, Frank Berninger⁴, Fangjie Mao¹, Xuejian Li¹, Liang Chen¹, Lu Cui¹, Yangguang Li¹, Di'en Zhu¹, Lin Xu¹

Affiliations

¹ State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China; Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China; School of Environmental and Resources Science, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China.
² State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China; Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China; School of Environmental and Resources Science, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China. Electronic address: zhougm@zafu.edu.cn.
³ State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China; Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China; School of Environmental and Resources Science, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China. Electronic address: dhqrs@126.com.
⁴ Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A & F University, Lin'an, 311300, Zhejiang, China; Department of Forest Ecology, P. O. Box 27, FI-00014, University of Helsinki, Finland & Institute for Atmospheric and Earth System Research/Forest Sciences Faculty of Agriculture and Forestry, University of Helsinki, Finland.

PMID: 29975899
DOI: 10.1016/j.jenvman.2018.06.046

Abstract

Lei bamboo (Phyllostachys praecox) is widely distributed in southeastern China. We used eddy covariance to analyze carbon sequestration capacity of a Lei bamboo forest (2011-2013) and to identify the seasonal biotic and abiotic determinants of carbon fluxes. A machine learning algorithm called random forest (RF) was used to identify factors that affected carbon fluxes. The RF model predicted well the gross ecosystem productivity (GEP), ecosystem respiration (RE) and net ecosystem exchange (NEE), and displayed variations in the drivers between different seasons. Mean annual NEE, RE, and GEP were -105.2 ± 23.1, 1264.5 ± 45.2, and 1369.6 ± 52.5 g C m^-2, respectively. Climate warming increased RE more than GEP when water inputs were not limiting. Summer drought played little role in suppressing GEP, but low soil moisture contents suppressed RE and increased the carbon sink during drought in the summer. The most important drivers of NEE were soil temperature in spring, summer, and winter, and photosynthetically active radiation in autumn. Air and soil temperature were important drivers of GEP in all seasons.

Keywords: Ecosystem respiration; Gross ecosystem productivity; Net ecosystem exchange; Phyllostachys praecox; Random forest; Seasonal variation.

MeSH terms

Carbon
Carbon Cycle*
Carbon Dioxide
Carbon Sequestration*
China
Ecosystem*
Models, Theoretical*

Substances

Carbon Dioxide
Carbon