The role of stream water carbon dynamics and export in the carbon balance of a tropical seasonal rainforest, southwest China

A two-year study (2009 ~ 2010) was carried out to investigate the dynamics of different carbon (C) forms, and the role of stream export in the C balance of a 23.4-ha headwater catchment in a tropical seasonal rainforest at Xishuangbanna (XSBN), southwest China. The seasonal volumetric weighted mean...

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Bibliographic Details
Published in:PloS one 2013-02, Vol.8 (2), p.e56646-e56646
Main Authors: Zhou, Wen-Jun, Zhang, Yi-Ping, Schaefer, Douglas A, Sha, Li-Qing, Deng, Yun, Deng, Xiao-Bao, Dai, Kai-Jie
Format: Article
Language:English
Subjects:
Agriculture
Biogeochemistry
Biology
Botanical gardens
Carbon
Carbon - chemistry
Carbon dioxide
Catchments
China
Creeks & streams
Discharge
Dissolved organic carbon
Dry season
Dynamic tests
Earth science
Earth Sciences
Ecology
Ecosystem
Ecosystems
Exports
Forests
Headwater catchments
Hydrology
Laboratories
Nitrogen - chemistry
Precipitation
Rain
Rain forests
Rainforests
Rainy season
Respiration
Rivers
Seasons
Soil sciences
Stream discharge
Studies
Surface water
Temperature
Trees - physiology
Tropical Climate
Water - chemistry
Water temperature
Wind
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Summary:A two-year study (2009 ~ 2010) was carried out to investigate the dynamics of different carbon (C) forms, and the role of stream export in the C balance of a 23.4-ha headwater catchment in a tropical seasonal rainforest at Xishuangbanna (XSBN), southwest China. The seasonal volumetric weighted mean (VWM) concentrations of total inorganic C (TIC) and dissolved inorganic C (DIC) were higher, and particulate inorganic C (PIC) and organic C (POC) were lower, in the dry season than the rainy season, while the VWM concentrations of total organic C (TOC) and dissolved organic C (DOC) were similar between seasons. With increased monthly stream discharge and stream water temperature (SWT), only TIC and DIC concentrations decreased significantly. The most important C form in stream export was DIC, accounting for 51.8% of the total C (TC) export; DOC, POC, and PIC accounted for 21.8%, 14.9%, and 11.5% of the TC export, respectively. Dynamics of C flux were closely related to stream discharge, with the greatest export during the rainy season. C export in the headwater stream was 47.1 kg C ha(-1) yr(-1), about 2.85% of the annual net ecosystem exchange. This finding indicates that stream export represented a minor contribution to the C balance in this tropical seasonal rainforest.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0056646