Carbon budgets of three temperate forest ecosystems in Dongling Mt., Beijing, China
Carbon budgets of three temperate forest ecosystems in Dongling Mt., Beijing, China
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DOI：
10.1007/s11430-007-2031-3
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发表时间：
2007-01-01
期刊：
影响因子：
--
通讯作者：
Liu ShaoHui
中科院分区：
文献类型：
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作者：
Fang JingYun;Liu GuoHua;Liu ShaoHui
人们普遍认为，北半球的森林生态系统是大气二氧化碳的重要汇；然而，其大小和分布仍然存在很大的不确定性。本文报道了1992-1994年间白桦林、辽东栎林和油松人工林三种温带森林生态系统的植被、林下碎屑和矿质土壤的碳(C)储量及其变化、年净生物量增量和凋落物生产量以及植被和土壤的呼吸作用。北京东凌、中国。然后，我们评估这些森林生态系统的碳预算。结果表明，这些森林的总碳密度(每公顷有机碳密度)在250~300t C ha(-1)之间，其中35~54 t C ha(-1)来自植被生物量C，209~244t C ha(-1)来自土壤有机C(1m深度，包括森林地面碎屑)。在研究期间，三种森林的生物量C均呈现净增加，为1.33~3.55t C ha(-1)a(-1)。凋落物生产量、植被自养呼吸和土壤异养呼吸分别为1.63~2.34、2.19~6.93和1.81~3.49tCha(-1)a(-1)。生态系统总初级生产力在5.39~12.82 t C ha(-1)a(-1)之间波动，其中约一半(46%~59%，3.20~5.89 t C ha(-1)a(-1))转化为净初级生产力。结果表明，松林固定碳为4.08tha(-1)a(-1)，而次生林(桦树林和栎林)大气和生态系统之间的CO2交换基本平衡。
There is a general agreement that forest ecosystems in the Northern Hemisphere function as significant sinks for atmospheric CO2; however, their magnitude and distribution remain large uncertainties. In this paper, we report the carbon (C) stock and its change of vegetation, forest floor detritus, and mineral soil, annual net biomass increment and litterfall production, and respiration of vegetation and soils between 1992 to 1994, for three temperate forest ecosystems, birch (Betula platyphylla) forest, oak (Quercus liaotungensis) forest and pine (Pinus tabulaeformis) plantation in Mt. Dongling, Beijing, China. We then evaluate the C budgets of these forest ecosystems. Our results indicated that total C density (organic C per hectare) of these forests ranged from 250 to 300 t C ha(-1), of which 35-54 t C ha(-1) from vegetation biomass C and 209-244 t C ha(-1) from soil organic C (1 m depth, including forest floor detritus). Biomass C of all three forests showed a net increase, with 1.33-3.55 t C ha(-1) a(-1) during the study period. Litterfall production, vegetation autotrophic respiration, and soil heterotrophic respiration were estimated at 1.63-2.34, 2.19-6.93, and 1.81-3.49 t C ha(-1) a(-1), respectively. Ecosystem gross primary production fluctuated between 5.39 and 12.82 t C ha(-1) a(-1), about half of which (46%-59%, 3.20-5.89 t C ha(-1) a(-1)) was converted to net primary production. Our results suggested that pine forest fixed C of 4.08 t ha(-1) a(-1), whereas secondary forests (birch and oak forest) were nearly in balance in CO2 exchange between the atmosphere and ecosystems.