退化森林生态系统恢复过程的碳同位素示踪  

CARBON ISOTOPE TRACERS FOR THE RESTORATION OF DEGENERATED FOREST ECOSYSTEM

作　　者：沈承德[1] 孙彦敏[1] 易惟熙[1] 彭少麟[2] 李志安[2] 

机构地区：[1]中国科学院广州地球化学研究所 [2]中国科学院华南植物研究所,广州510650

出　　处：《第四纪研究》2001年第5期452-460,共9页Quaternary Sciences

基　　金：国家自然科学基金 (批准号 :4 9973 0 0 9;3 98993 70 ;4 9894 1 70和 4 9872 0 93 )资助项目;中国科学院"九五"重大项目 (批准号 :KZ95 1 A1 4 0 2 0 8 0 1 );中国科学院"九五"重点项目 (批准号 :KZ95 2 J1 4 0 2 );国家重点基础研究发展规划项目 (批准

摘　　要：本文以鼎湖山自然保护区和鹤山丘陵综合试验站为对象 ,开展不同地区、不同森林类型的土壤有机碳 (SOC)同位素示踪研究 ,探讨退化生态系统恢复过程中碳同位素的示踪作用。庆云寺和仓下剖面代表自然林 ,SOC的δ13C平均值分别为 - 2 4 63‰和 - 2 3 76‰ ;坑口和马占林剖面代表草坡上植树造林恢复的人工林 ,SOC的δ13C平均值分别为 - 2 1 2 2‰和- 2 2 73‰ ;剖面底界SOC的14 C表观年龄前者分别为 875 0aB .P .和 1 0 31 5aB .P .,后者分别为 2 880aB .P .和 41 1 3aB .P .。在SOC的14 C表观年龄老的丘陵草坡上进行退化生态系统重建 。Through investigation and comparison of δ 13 C, Δ 14 C and 14 C apparent ages of organic carbon (SOC) of soil samples from soil profiles in typical natural forest and man made forest communities in Dinghushan natural reserve (23°09′22″～23°11′30″N, 112°30′39″～ 112°33′41″E) and Heshan Hill Land Interdisciplinary Experimental Station, Chinese Academy of Sciences (22°46′N, 112°57′E), carbon isotopes as indicators for restoration process of degenerated forest ecosystems has been discussed.\;The vegetation types at the Qingyunsi and Cangxia profiles are monsoon broad leaved evergreen forest and monsoon broad leaved secondary evergreen forest, respectively, all belonging to the natural forest community. The vegetation types at the Kengkou and Mazhanlin profiles, however, are man made forest with planted Chinese rhoiptelea coniferous forest and the Mazhan Xiangsishu as the prodophytium, all belong to man made forest community rebuilt in grassland. The average δ 13 C values at the Qingyunsi and Cangxia profiles are -24.63‰ and -23.76‰, respectively, and the 14 C apparent ages of the bottom boundary SOC are 8?750 aB.P. and 10?315 aB.P. respectively. The average δ 13 C values at the Keng kou and Mazhanlin profiles are -21.22‰ and -22.73‰, respectively, and the 14 C apparent ages of the bottom boundary SOC are 2?880 a B.P. and 4?113 a B.P. respectively.\;Through comparison of the above mentioned 4 profiles for δ 13 C, Δ 14 C and 14 C apparent ages, it is clear that carbon isotope information of SOC can be expected to provide the following indication for planning in the restoration of a degenerated forest ecosystem:\;(1) Restoration or re establishment of an ecosystem at hill grassland with older 14 C ages are more beneficial to the succession of a man made forest community toward a zonal forest community;\;(2) In the process of the succession of a man made forest community toward a zonal forest vegetat

关 键 词：退化森林生态系统 碳同位素示踪 土壤有机质 人工林 

分 类 号：S718.55[农业科学—林学]