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生态学杂志 ›› 2012, Vol. 31 ›› Issue (10): 2473-2478.

• 研究报告 • 上一篇    下一篇

纳板河流域土地利用变化对土壤有机碳及微生物生物量碳和氮的影响

郭芳芳,李永梅,李朝丽**,王自林   

  1. (云南农业大学资源与环境学院, 昆明 650201)
  • 出版日期:2012-10-10 发布日期:2012-10-10

Effects of land use change on soil organic carbon and microbial biomass carbon and nitrogen in Naban River watershed, Yunnan Province of Southwest China.

GUO Fang-fang, LI Yong-mei, LI Zhao-li**, WANG Zi-lin   

  1. (College of Resources and Envionment, Yunnan Agricultural University, Kunming 650201, China)
  • Online:2012-10-10 Published:2012-10-10

摘要: 与其他地区相比,热带森林的土地利用变化对碳循环的影响尤其显著。本文采用野外调查取样和室内分析相结合的方法,研究了纳板河流域自然林转变为旱地、水稻田、橡胶林、茶园后土壤有机碳(SOC)、土壤微生物生物量碳(SMBC)和微生物生物量氮(SMBN)的变化。结果表明:自然林转变为其他土地利用类型后,SOC、SMBC、SMBN均显著下降,水稻田的SOC和SMBC下降幅度最大。赤红壤的SOC和SMBC、SMBN均显著高于砖红壤。相关性分析表明:SOC与SMBC、SMBN、土壤含水量呈显著或极显著正相关,与土壤容重、pH呈极显著负相关;SMBN与SOC、SMBC呈极显著正相关,与土壤容重呈显著负相关;微生物商与pH呈极显著正相关。

关键词: 掘根, 尖削度, 树冠特性, 林分密度, 土壤含水率

Abstract: The land use change in tropical forest area, as compared to that in other areas, is more vital to global carbon cycle. Taking the Naban River watershed in Xishuangbanna of Yunnan as study area, and by the methods of field survey and laboratory analysis, this paper studied the effects of the land use change from natural forest to dry farmland, paddy field, rubber plantation, or tea garden on the soil organic carbon (SOC) and soil microbial biomass carbon (SMNC) and nitrogen (SMBN). The results showed that after the natural forest changed into other land use types, the SOC, SMBC, and SMBN decreased significantly, with the greatest decrements of SOC and SMBC in paddy field. The SOC, SMBC, and SMBN were significantly higher in latosolic red soils than in latosols. The SOC was significantly positively correlated with SMBC, SMBN, and soil moisture, and significantly negatively correlated with soil bulk density and soil pH. The SMBN was significantly positively correlated with SOC and SMBC, and significantly negatively correlated with soil bulk density. The ratio of SMBC to SOC was significantly positively correlated with soil pH.

Key words: uprooting, taper degree, crown characteristics, stand density, soil moisture.