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不同土地利用类型土壤有机碳各库大小及分解动态
引用本文:陈锦盈,孙波,李忠佩,李海鹰,潘剑君.不同土地利用类型土壤有机碳各库大小及分解动态[J].水土保持学报,2008,22(1):91-95.
作者姓名:陈锦盈  孙波  李忠佩  李海鹰  潘剑君
作者单位:1. 南京农业大学,资源与环境科学学院,南京,210095
2. 中国科学院南京土壤研究所,南京,210007
摘    要:依据三库一级动力学理论,以下蜀黄土为对象,研究了天然林地、新旱地和老旱地土壤不同土层有机碳各库大小和分解动态,探讨了土地利用变更对土壤有机碳的影响。结果表明:下蜀黄土上发育的黄棕壤表层、中层和下层土壤总有机碳库大小分别为7 818.34~9 242.30 m g/kg,3 093.66~3 338.59 m g/kg,2 337.27~3188.40m g/kg。各碳库占总有机碳比例及平均驻留时间为:活性碳库0.41%~3.81%,平均驻留时间3~40天;缓效性碳库23.23%~79.11%,平均驻留时间5~24年;惰性碳库18.11%~74.80%。土地利用类型从天然林地—新旱地—老旱地转变导致各层土壤缓效性碳库减小,中层惰性碳库增大,随着旱地耕作时间增长这种趋势越明显。根据呼吸培养结果发现土壤有机碳分解具有前期快速分解和后期稳定分解两个阶段,快速分解期为活性碳平均驻留时间。研究表明,旱地土壤较之天然林地具有更大的固碳能力,只要合理管理与耕作,旱地将是一个巨大的碳汇。

关 键 词:下蜀黄土  土地利用类型  土壤有机碳  分解速率
文章编号:1009-2242(2008)01-0091-05
修稿时间:2007年8月1日

Pool Size of Soil Organic Carbon and Dynamics under Dfferent Land Use
CHEN Jin-ying,SUN Bo,LI Zhong-pei,LI Hai-ying,PAN Jian-jun.Pool Size of Soil Organic Carbon and Dynamics under Dfferent Land Use[J].Journal of Soil and Water Conservation,2008,22(1):91-95.
Authors:CHEN Jin-ying  SUN Bo  LI Zhong-pei  LI Hai-ying  PAN Jian-jun
Abstract:This paper studied the size and the dynamics of different land use soil organic carbon in Xiashu and discussed the influence on soil carbon pool of land use change,based on the three pool theory.The results indicate: The total soil organic carbon for 0~20 cm,20~40 cm and 70~100 cm layers are 7 818.34~9 242.30 mg/kg,3 093.66~3 338.59 mg/kg and 2 337.27~3 188.40 mg/kg.The slow carbon pool in all layers reduced when the land use changes from forest to dry field; and the passive carbon pool increased in mid-layer.These differences will augment with the increase of cultivation time.The proportion of each carbon pool has no obvious change.The proportion for active,slow and passive pool are 0.41% ~3.81%,23.23%~79.11%,18.11%~74.80%.The mean residue time for active and slow pool are 3~40 days and 5~24 years.Soil organic carbon decomposition has two phases: fast decomposition in early time and slow decomposition in late time.The fast decomposition phase is the mean residue time of active carbon.The authors have the point of view that the dry field is more powerful than forest in carbon sequestration.The dry field will be a large carbon sink under good management and effective tillage control measure.
Keywords:Xiashu loess  land use  soil organic carbon  decomposition rate
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