不同森林植被下土壤有机碳的分解特征及碳库研究

第19卷第3期2005年6月

水土保持学报

Journal of S oil and Water Conservation

Vol.19No.3

J un.,2005

不同森林植被下土壤有机碳的分解特征及碳库研究Ξ

邵月红1,潘剑君1,3,孙　波2

(1.南京农业大学资源与环境学院,南京210095;2.中国科学院南京土壤研究所,南京210008)

摘要:分析了不同森林植被和同一植被不同林龄的人工杉木林下土壤有机碳的分解特征及土壤有机碳中的活性

碳库、缓效性碳库和惰效性碳库的大小和周转时间。结果表明:不同森林植被下土壤有机碳的分解速率不同,总

的趋势都是:培养前期分解速度快,后期分解速度慢,土壤剖面A层>剖面B层。在剖面A层中:不同森林植被

下分解速率的大小顺序为常绿阔叶林>人工杉木林,不同林龄的人工杉木林为成熟林>中龄林>幼龄林;在剖面

B层中:分解速率差异不大。不同森林植被下不同土壤剖面上的土壤活性碳库、缓效性碳库和惰效性碳库的库容

和分解速率不同,土壤活性碳库碳含量一般占总有机碳的0199%～2189%,田间平均驻留时间为10～23天;土

壤缓效性碳一般占总有机碳的17117%～55146%,田间平均驻留时间为116～2412年;土壤惰效性碳一般占总

有机碳的42105%～80166%,田间平均驻留时间为假定的1000年。

关键词:湿润中亚热带;　有机碳;　分解特征;　碳库;　活性碳;　缓效性碳;　惰效性碳

中图分类号:S1531621 文献标识码:A 文章编号:100922242(2005)0320024205

Study on Characteristics of Soil Organic C arbon Decompositions and

C arbon Pool under Different V egetations

SHAO Yue2hong1,PAN Jian2jun1,SUN Bo2

(1.College of Resource and Environmental Sciences,N anjing A gricultural U niversity,N anjing210095;

2.Institute of Soil Science,Chinese Academy of Sciences,N anjing210008)

Abstract:The characteristics of soil organic carbon(SOC)decompositions and the carbon pool sizes and turnover rates of active carbon pool,slow carbon pool and passive carbon pool under different vegetations and Chinese fir plantation of different forest ages are discussed1The results indicate that the general trend is there is a faster de2 composition rate in the first incubation period than in the second period and in the surface soil than in the sub2 soil1In the surface soil,effect of decomposition rate on different vegetations is broad leaved forest>mature Chinese fir plantation and on Chinese fir plantation of different forest ages is midaged forest>mature forest>young for2 est1In the subsoil,there is a few differences on decomposition rate and culmulative amount of carbon mineralized under different vegetations;Effect of culmulative amount of soil organic carbon mineralized on different vegetations and Chinese fir plantation of different forest ages is the first month>the second month>the third month,the sur2 face soil>the subsoil1In the surface soil,the effect is midaged Chinese fir plantation>broad leaved forest>ma2 ture Chinese fir plantation>young Chinese fir plantation;There is a different carbon pool sizes and turnover rate of activecarbon pool,slow carbon pool and passive carbon pool under different vegetations and Chinese fir plantation of different forest ages,the active pool(Ca)comprised1170%to4198%of the SOC in the surface and subsoil with an average field mean residence time(MR T)of10to23d,the slow pool comprised16121%to49152%of the SOC,they had field MR T of018to1311year,the passive pool comprised46122%to80150%with a assumed field MR T of1000year.

K ey w ords:humid midsubtropical;　organic carbon;　characteristics of decompositions;　carbon pool;

active carbon;　slow carbon;　passibe carbon

森林作为陆地生态系统中最大的有机碳库,在陆地生态系统碳循环中起着重要的作用[1],而森林土壤又是森林生态系统中最大的碳库,因此了解森林土壤碳循环是研究陆地生态系统碳循环的重要前提[2]。森林土壤碳库是陆地碳库的重要组成部分,包括土壤有机碳和土壤无机碳。这些碳库的变化被认为是导致大气碳库

Ξ收稿日期:2004212215　3通讯作者

基金项目:外交部全球环境基金项目(CPR/00/G33/A/1G/99);加拿大国际开发局(CIDA)项目

作者简介:邵月红,女,生于1977年,在读硕士。主要从事土壤碳平衡建模研究。