摘 要(英文)：There is significant importance of total organic carbon (TOC) transport during the hydrological processes in forest ecosystem, for which plays an important role at intra-ecosystem carbon dynamics and carbon dynamics during successions. It is probably helpful in finding “missing carbon sink”, too. This research was conducted in Dinghushan Biosphere Reserve (DHSBR), which is located in lower subtropical China. There are three main forest types including Pinus massoniana forest (PMF), pine and broadleaf mixed forest (PBMF), monsoon evergreen broadleaf forest (MEBF) in Dinghushan, which represent three stages of a series of forest succession. Water samples from 6 hydrological processes, ie, precipitation, throughfall, stemflow, soil water of As-horizon(25～30cm in depth, SW1), soil water of C-horizon (50～80cm in depth, SW2) and stream flow of PMF, PBMF1, PBMF2年nd MEBF were collected on a rain event bases from May 2003 to September 2003. TOC concentrations were determined by TOC analyzer (TOC-V, Shimadzu, Japan) in o rder to ravel the
changes of TOC concent rat ion in a single fo rest and during successions. The results show ed (1) the relat ive increment of TOC
concent rat ion in th roughfall versus that in p recip itat ion happened in the th ree main fo rest types w as exp ressed asM EBF >
PBM F 1 > PBM F 2 > PM F; (2) TOC concent rat ion of stemflow w as exp ressed as PM F > PBM F 2 > PBM F 1 > M EBF;
(3) TOC concent rat ion of SW 1 is much h igher than that of SW 2; (4) the st ream w ater in the P inus m assoniana fo rest has the h ighest TOC concent rat ion; (5) There w ere sim ilar tendency of TOC concent rat ions during the hydro logical p rocesses in th ree
main fo rest types, w h ich w ere stemflow > th roughfall > SW 1> SW 2 > st ream w ater. But variat ion of TOC concent rat ions
during the hydro logical p rocesses inM EBF w as the low est in the th ree fo rest typesw h ile that in PM F w as the h ighest. A ll of
the results indicated that (1) changes of canopy st ructure and t ree species during successions can affect the concent rat ion of
TOC during the hydro logical p rocesses; (2) TOC t ranspo rted during hydro logical p rocesses w as mo st ly sto red in the fo rest
eco system; (3) the resistance of mature fo rest w as h igher than that of p ioneer community.
鼎湖山三种主要林型水文学过程中总有机碳浓度对比