鼎湖山土壤有机质δ13C时空分异机制

应用生态学报 ›› 2005, Vol. 16 ›› Issue (3): 469-474.

鼎湖山土壤有机质δ¹³C时空分异机制

陈庆强^1,2, 沈承德², 孙彦敏², 彭少麟³, 易惟熙², 李志安³, 姜漫涛²

1. 华东师范大学河口海岸国家重点实验室, 上海, 200062;
2. 中国科学院广州地球化学研究所, 广州, 510640;
3. 中国科学院华南植物研究所, 广州, 510650

收稿日期:2004-02-05 修回日期:2004-06-17 出版日期:2005-03-15 发布日期:2005-03-15
通讯作者: 陈庆强,男,1969年生,博士,副研究员.主要从事海洋沉积与生物地球化学方面的教学与研究,发表论文30余篇.Tel:021-62233758; E-mail:qqchen@sklec.ecnu.edu.cn
基金资助:
国家自然科学基金重大项目(39728102)、国家自然科学基金项目(40202032)、中国博士后科学基金项目、广东省自然科学基金博士启动项目(984105)和中国科学院广州地球化学研究所所长基金资助项目.

Spatial and temporal differentiation of mountainous soil organic matter δ ¹³C in Dinghushan Biosphere Reserve.

CHEN Qingqiang^1,2, SHEN Chengde², SUN Yanmin², PENG Shaolin³, YI Weixi², LI Zhi'an³, JIANG Mantao ²

1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;
2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
3. South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China

Received:2004-02-05 Revised:2004-06-17 Online:2005-03-15 Published:2005-03-15

摘要/Abstract

摘要： 根据鼎湖山若干海拔部位土壤剖面薄层取样样品有机质含量、¹⁴C测年及δ¹³C结果,研究土壤有机质δ¹³C时空分异机制.结果表明,不同海拔土壤剖面有机质δ¹³C深度特征受控于剖面发育进程,与有机质组成及其分解过程密切相关.植被枯落物成为表土层有机质以及表土层被埋藏后的有机质更新过程,均存在碳同位素分馏效应,有机质δ¹³C显著增大.相对于地表植被枯落物δ¹³C,表土层有机质δ¹³C增幅取决于表土有机质更新速率.表土有机质δ¹³C与植被枯落物δ¹³C均随海拔升高而增大,说明植被构成随海拔升高呈规律性变化.这与鼎湖山植被的垂直分布一致.不同海拔土壤剖面有机质δ¹³C-深度特征类似,有机质含量深度特征一致,有机质¹⁴C表观年龄自上向下增加.这是剖面发育过程中有机质不断更新的结果.土壤剖面有机质δ¹³C最大值深度与¹⁴C弹穿透深度的成因和大小不同,均反映地貌与地表植被对有机碳同位素深度分布的控制.

关键词: 土壤有机质, 碳同位素, 碳循环, 亚热带, 鼎湖山

Abstract: Based on the determinations of soil organic matter (SOM) content,SOM Δ¹⁴C,and SOM δ¹³C of the samples collected by thin layered sampling method,this paper studied the spatial and temporal differentiation of SOM δ¹³C in the soil profiles at different altitudes in Dinghushan Biosphere Reserve.The results showed that the vertical differentiation of SOM δ¹³C at different altitudes was controlled by the development of soil profile,and closely correlated with the composition of SOM and its turnover processes.The fractionation of carbon isotope was happened during both the transformation of vegetation debris into topsoil organic matter (OM) and its regeneration after the topsoil buried,which resulted in a significant increase of SOM δ¹³C.Relative to plant debris δ¹³C,the δ¹³C increment of topsoil OM was more dependent on its turnover rate.Both the δ¹³C of plant debris and topsoil OM increased with altitude,indicating the regular variation of vegetations with altitude,which was consensus to the vertical distribution of vegetations in Dinghushan Biosphere Reserve.Soil profiles at different altitudes had similar characteristics in vertical differentiation of SOM δ¹³C,vertical distribution of SOM content,and increasing apparent age of SOM ¹⁴C with soil depth,which were resulted from the successive turnover of SOM during the development of soil profile.The maximum depth of SOM δ¹³C in soil profile was different in origin and magnitude with the penetration depth of ¹⁴C produced by nuclear explosion in the atmosphere,indicating the controlling effects of topography and vegetation on the distribution of SOM carbon isotope with soil depth.

Key words: Soil organic matter, ¹⁴C, Carbon cycling, Subtropical zone, Dinghushan Biosphere Reserve

中图分类号:

S153.621

陈庆强, 沈承德, 孙彦敏, 彭少麟, 易惟熙, 李志安, 姜漫涛. 鼎湖山土壤有机质δ¹³C时空分异机制[J]. 应用生态学报, 2005, 16(3): 469-474.

CHEN Qingqiang, SHEN Chengde, SUN Yanmin, PENG Shaolin, YI Weixi, LI Zhi'an, JIANG Mantao . Spatial and temporal differentiation of mountainous soil organic matter δ ¹³C in Dinghushan Biosphere Reserve.[J]. Chinese Journal of Applied Ecology, 2005, 16(3): 469-474.

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鼎湖山土壤有机质δ¹³C时空分异机制

Spatial and temporal differentiation of mountainous soil organic matter δ ¹³C in Dinghushan Biosphere Reserve.

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