NDLI: CO$_{2}$ flux evaluation over the evergreen coniferous and broad-leaved mixed forest in Dinghushan, China

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CO$_{2}$ flux evaluation over the evergreen coniferous and broad-leaved mixed forest in Dinghushan, China

Content Provider	Springer Nature Link
Author	Wang, Chunlin Yu, Guirui Zhou, Guoyi Yan, Junhua Zhang, Leiming Wang, Xu Tang, Xuli Sun, Xiaomin
Copyright Year	2006
Abstract	The Dinghushan flux observation site, as one of the four forest sites of ChinaFLUX, aims to acquire long-term measurements of CO$_{2}$ flux over a typical southern subtropical evergreen coniferous and broad-leaved mixed forest ecosystem using the open path eddy covariance method. Based on two years of data from 2003 to 2004, the characteristics of temporal variation in CO$_{2}$ flux and its response to environmental factors in the forest ecosystem are analyzed. Provided two-dimensional coordinate rotation, WPL correction and quality control, poor energy-balance and underestimation of ecosystem respiration during nighttime implied that there could be a CO$_{2}$ leak during the nighttime at the site. Using daytime (PAR > 1.0 μmol$^{−1}$·m$^{−2}$·s$^{−1}$) flux data during windy conditions (u* > 0.2 m·s$^{−1}$), monthly ecosystem respiration (Reco) was derived through the Michaelis-Menten equation modeling the relationship between net ecosystem C0$_{2}$ exchange (NEE) and photosynthetically active radiation (PAR). Exponential function was employed to describe the relationship between Reco and soil temperature at 5 cm depth (Ts05), then Reco of both daytime and nighttime was calculated respectively by the function. The major results are: (i) Derived from the Michaelis-Menten equation, the apparent quantum yield (α) was 0.0027±0.0011 mgCO$_{2}$·μmol$^{−1}$ photons, and the maximum photosynthetic assimilation rate (Amax) was 1.102±0.288 mgCO$_{2}$·m$^{−2}$·s$^{−1}$. Indistinctive seasonal variation of α or Amax was consistent with weak seasonal dynamics of leaf area index (LAf) in such a lower subtropical evergreen mixed forest, (ii) Monthly accumulated Reco was estimated as 95.3±21.1 gC·m$^{−2}$mon$^{−1}$, accounting for about 68% of the gross primary product (GPP). Monthly accumulated WEE was estimated as −43.2±29.6 gC·m$^{−2}$·mon$^{−1}$. The forest ecosystem acted as carbon sink all year round without any seasonal carbon efflux period. Annual NEE of 2003 and 2004 was estimated as −563.0 and −441.2 gC·m$^{−2}$·a$^{−1}$ respectively, accounting for about 32% of GPP.
Starting Page	127
Ending Page	138
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	49
Issue Number	2
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	carbon dioxide flux eddy covariance Dinghushan southern subtropical region evergreen coniferous and broad-leaved mixed forest ChinaFLUX Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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