作　　者： ; ; ; ; ; ;

机构地区： 中国科学院华南植物园

出　　处： 《生态学报》 2004年第12期2973-2978,共6页

摘　　要： 为了解碳在森林内部以及群落演替过程中的转运动态 ,对鼎湖山 3种主要林型 (马尾松林 ,马尾松针阔混交林和季风常绿阔叶林 )森林水文学过程中总有机碳 (total organic carbon,TOC)浓度进行了一个雨季的观测 ,结果发现 :(1)穿透水中 TOC浓度相对大气降水中 TOC浓度的增量为 :季风常绿阔叶林 >马尾松针阔混交林 1>马尾松针阔混交林 2 >马尾松林 ;(2 )树干茎流平均 TOC浓度为 :马尾松林 >马尾松针阔混交林 2 >马尾松针阔混交林 1>季风常绿阔叶林 ;(3)各林内土壤水 TOC浓度差异不明显 ,但根系层 (2 5～ 30 cm)土壤水 TOC浓度均大于母质层 (5 0～ 80 cm) TOC浓度 ;(4 )马尾松林的溪水具有较高的 TOC浓度和较大的月际波动 ;(5 )总体上 ,整个森林水文学过程中 ,3种林型 TOC浓度变化趋势相似 ,均为 :树干茎流 >穿透水 >根系层土壤水 >母质层土壤水 >溪水 ,但变化幅度不同 :马尾松林的变化幅度最大 ,季风林的最小 ,而两个混交林居中。这表明 ,(1)森林演替过程中 ,林冠层结构、树种构成等的改变可能引起森林水文学过程中 TOC浓度的变化 ;(2 )森林水文学过程转运的碳主要储存在森林内部 ;(3) 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 order to ravel the changes of TOC concentration in a single forest and during successions. The results showed (1) the relative increment of TOC concentration in throughfall versus that in precipitation happened in the three main forest types was expressed as MEBF> PBMF 1 > PBMF 2 > PMF; (2) TOC concentration of stemflow was expressed as PMF > PBMF 2 > PBMF 1 > MEBF; (3) TOC concentration of SW1 is much higher than that of SW2; (4) the stream water in the Pinus massoniana forest has the highest TOC concentration; (5) There were similar tendency of TOC concentrations during the hydrological processes in three main forest types, which were stemflow > throughfall > SW1> SW2 > stream water. But variation of TOC concentrations during the hydrological processes in MEBF was the lowest in the three forest types while that in PMF was the highest. All of the results indicated that (1) changes of canopy structure and tree species during successions can affect the concentration of TOC during the hydrological p

关 键 词： 总有机碳 浓度 鼎湖山 演替 森林水文学过程

领　　域： [生物学]