湘中丘陵区不同恢复阶段森林生态系统的碳储量特征  

Characteristics of Forest Ecosystem Carbon Stocks at Different Vegetation Restoration Stages in Hilly Area of Central Hunan Province,China

作　　者：王振鹏 陈金磊 李尚益 张仕吉[1] 方晰[1,2] Wang Zhenpeng;Chen Jinlei;Li Shangyi;Zhang Shiji;Fang Xi(School of Life Science and Technology,Central South University of Forestry and Technology ,Changsha 410004;Huitong National Field Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystem in Hunan Province, Huitong 438107)

机构地区：[1]中南林业科技大学生命科学与技术学院,长沙410004 [2]湖南会同杉木林生态系统国家野外科学观测研究站,会同438107

出　　处：《林业科学》2020年第5期19-28,共10页Scientia Silvae Sinicae

基　　金：国家林业局林业公益性行业科研专项项目(201504411)。

摘　　要：【目的】探讨亚热带植被恢复过程中森林生态系统碳储量及其在各层次(植被层、枯落物层、土壤层)分配格局的变化,为揭示植被恢复对森林生态系统碳汇功能的影响机制和分阶段实施森林生态系统碳库管理措施提供科学依据。【方法】采用空间代替时间的方法,在湘中丘陵区选取地域毗邻、环境条件基本一致的檵木+南烛+杜鹃灌草丛(LVR)、檵木+杉木+白栎灌木林(LCQ)、马尾松+柯+檵木针阔混交林(PLL)、柯+红淡比+青冈常绿阔叶林(LAG)作为一个恢复序列,设置固定样地,采用收获法建立部分主要树种相对生长方程和引用部分主要树种通用生长方程估算生物量,采集0~10、10~20、20~30和30~40 cm土层土壤样品,测定植物、土壤碳含量,估算生态系统各层次的碳储量。【结果】植被层各组分碳含量随植被恢复而变化,同一恢复阶段各组分碳含量基本上表现为乔木层>灌木层>草本层;枯落物层碳含量以PLL最高,其次为LAG,LCQ最低;同一土层碳含量随植被恢复而增加;从LVR到LAG,植被层、枯落物层、0~40 cm土壤层和生态系统碳储量分别增加了70.80、1.17、67.05和139.02 tC·hm-2;植被层、生态系统碳储量各阶段间的增长速率均呈先快后慢的特征,而土壤层呈快—慢—快的特征;不同恢复阶段生态系统碳储量具有一致的垂直分配格局:0~40 cm土壤层>植被层>枯落物层;随植被恢复,植被层碳储量对生态系统碳储量的贡献率呈增加趋势,而土壤层碳储量的贡献率呈下降趋势,枯落物层变化不大;生态系统、植被层、土壤层碳储量与植物多样性指数(除植被层外)、植被层生物量、土壤碳含量显著(P<0.05)或极显著(P<0.01)正相关。【结论】随着植被恢复,植物多样性、植被层生物量、土壤碳含量、植被层碳储量、土壤层碳储量和生态系统碳储量均增加,但各阶段的增长速率不同。为了提高亚热带森林生态系�【Objective】The aims of this study were to investigate the change trends of carbon storage and its distribution pattern(vegetation,litter and soil layer)within forest ecosystems at different restoration stages in hilly area of central Hunan Province of China,in order to provide a scientific basis for explaining the influence mechanism of vegetation restoration on carbon sink function of forest ecosystem,and implementing forest ecosystem carbon reservoir management measures in stages.【Method】By using the space-for-time substitution method,we selected four different types of ecosystems,comprising of Loropetalum chinense+Vaccinium bracteatum+Rhododendron simsii scrub-grass-land(LVR),L.chinense+Cunninghamia lanceolata+Quercus fabri shrubbery(LCQ),Pinus massoniana+Lithocarpus glaber+L.chinense coniferous-broad leaved mixed forest(PLL),and L.glaber+Cleyera japonica+Cyclobalanopsis glauca evergreen broad-leaved forest(LAG)to represent the successional sequence in the secondary forests in Changsha County,Hunan Province,China.Permanent plots were established in each ecosystems.Biomass was estimated by using the total harvesting method to establish relative growth equations of some dominant tree species and citing allometric equations of biomass of some dominant tree species.Soil samples(0-40 cm)were collected and divided into four layers(0-10,10-20,20-30,and 30-40 cm).Carbon contents in plant,litter,and soil samples were determinated,and carbon storage of vegetation,litter,and soil were estimated.【Result】Carbon contents of different components at different vegetation layers varied with vegetation restoration.In the same restoration stage,carbon contents of different components at different vegetation layers ranked in the order of the arbor layer>the shrub layer>the herb layer.Carbon contents of litter were highest in PLL,followed by LAG and LCQ as the lowest.Soil organic carbon contents increased with the vegetation restoration.From LVR to LAG,carbon storage of vegetation,litter,0-40 cm soil and ecosystem incre

关 键 词：植被恢复 植被层 土壤层 碳储量 湘中丘陵区 

分 类 号：S718.55[农业科学—林学]