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>The Role of Stream Water Carbon Dynamics and Export in the Carbon Balance of a Tropical Seasonal Rainforest, Southwest China
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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 (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.
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机译:进行了为期两年的研究(2009年至2010年),研究了西双版纳热带季节性雨林中不同碳(C)形态的动态以及溪流出口在23.4公顷源头流域C平衡中的作用。 XSBN),中国西南。旱季的总无机碳(TIC)和溶解的无机C(DIC)的季节体积加权平均(VWM)浓度较高,而雨季的总无机碳(PIC)和有机碳(POC)浓度较低。 ,而不同季节的总有机碳(TOC)和溶解有机碳(DOC)的VWM浓度相似。随着每月溪流排放量和溪水温度(SWT)的增加,只有TIC和DIC浓度显着下降。物流出口中最重要的碳形态是DIC,占碳(TC)出口总量的51.8%。 DOC,POC和PIC分别占技术产品出口的21.8%,14.9%和11.5%。碳通量的动态与河流排放密切相关,在雨季出口量最大。源头水流中的碳出口为47.1 kg C ha -1 sup> yr -1 sup>,约占年度生态系统净交换量的2.85%。这一发现表明,在这种热带季节性雨林中,溪流出口对碳平衡的贡献很小。
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