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Zhou W.-J.,CAS Xishuangbanna Tropical Botanical Garden | Zhou W.-J.,Chinese Ecosystem Research Net | Zhou W.-J.,University of Chinese Academy of Sciences | Zhang Y.-P.,CAS Xishuangbanna Tropical Botanical Garden | And 9 more authors.
PLoS ONE | Year: 2013

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. © 2013 Zhou et al. Source


Zhou W.-J.,CAS Xishuangbanna Tropical Botanical Garden | Zhou W.-J.,Chinese Ecosystem Research Net | Zhou W.-J.,University of Chinese Academy of Sciences | Sha L.-Q.,CAS Xishuangbanna Tropical Botanical Garden | And 16 more authors.
Soil Biology and Biochemistry | Year: 2015

To clarify how litter decomposition processes affect soil dissolved organic carbon (DOC) and soil dissolved nitrogen (DN) dynamics, we conducted a field experiment on leaf litter and collected DOC and DN from the underlying soil in a tropical rainforest in Xishuangbanna, southwest China. Principal components analysis (PCA) showed the first PCA axis (corresponding to degraded litter quantity and quality) explained 61.3% and 71.2% of variation in DOC and DN concentrations, respectively. Stepwise linear regression analysis indicated that litter carbon mass controlled DOC and hemicellulose mass controlled DN concentrations. Litter decomposition was the predominant factor controlling surface-soil DOC and DN dynamics in this tropical rainforest. © 2014 Elsevier Ltd. Source

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