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红壤丘陵景观单元土壤有机碳和微生物生物量碳含量特征

唐国勇1,2;黄道友1;童成立1;张文菊1;肖和艾1;苏以荣1;吴金水1   

  1. 1中国科学院亚热带农业生态研究所亚热带农业生态重点实验室,长沙 410125;2中国科学院研究生院,北京 100039
  • 收稿日期:2005-04-30 修回日期:2005-10-08 出版日期:2006-03-18 发布日期:2006-03-18

Characteristics of soil organic carbon and microbial biomass carbon in hilly red soil region

TANG Guoyong1,2;HUANG Daoyou1;TONG Chengli1;ZHANG Wenju1,XIAO Heai1;SU Yirong1;WU Jinshui1    

  1. 1Key Laboratory of Subtropical Agro-Ecology,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China;2Graduate School of Chinese Academy of Sciences,Beijing 100039,China

  • Received:2005-04-30 Revised:2005-10-08 Online:2006-03-18 Published:2006-03-18

摘要: 为了探讨我国亚热带红壤丘陵区不同利用方式下土壤有机碳(SOC)和土壤微生物生物量碳(SMB-C)含量的特征,在湖南省桃源县选取典型样区,通过密集取样,分析了红壤丘陵景观单元内水田、旱地、林地、果园4种典型利用方式下表层土壤(0~20 cm)SOC和SMB-C含量.结果表明,典型红壤丘陵景观单元中SOC含量高低的顺序为水田(16.0 g·kg-1)>旱地(11.2 g·kg-1) >果园(9.5 g·kg-1)>林地(8.4 g·kg-1),SMB-C含量则为水田(830 mg·kg-1)>旱地(361 mg·kg-1)>林地(200 mg·kg-1)>果园(186 mg·kg-1),且在不同利用方式下SOC与SMB-C均呈极显著正相关(P<0.01),说明本研究区内各土地利用类型的土壤SMB-C含量变化可以敏感地指示SOC的动态.研究结果还表明,将我国亚热带红壤丘陵林地开垦为果园或耕地后,表层土壤 SOC含量不可能降低.

关键词: 珍稀濒危植物, 优先保护级别, 内蒙古, 濒危等级

Abstract: In this paper,535 soil samples (0~20 cm) were taken from the woodland,orchard,upland,and paddy field in the hilly red soil region of south China,and the quantitative characteristics of soil organic carbon (SOC) and soil microbial biomass carbon (SMB-C) were studied.The results showed that SOC content was the highest (16.0 g·kg-1) in paddy field and the lowest (8.4 g·kg-1) in woodland,while SMB-C content was the highest in paddy field (830 mg·kg-1) and the lowest in orchard (200 mg·kg-1).There was a highly significant positive correlation (P<0.01) between the contents of SOC and SMB-C in the four landuse types.It was suggested that the changes of SMB-C content could sensitively indicate the dynamics of SOC.The transition from woodland to orchard or cultivated land in hilly red soil region would not decrease the SOC content.

Key words: rare and endangered plants, Inner Mongolia., endangered grade, conservation priority