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作 者 ：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

期 刊 ：应用生态学报 2006年 17卷 03期 页码：429-433

关键词：土壤；

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.

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.

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