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神农架自然保护区土壤微生物生物量碳、氮沿海拔梯度的变化及其影响因素

丛静1,2,刘晓2,卢慧2,薛亚东2,刘学端1,尹华群1,李迪强2,张于光2**   

  1. 1中南大学资源加工与生物工程学院, 长沙 410083; 2中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态重点实验室, 北京 100091)
  • 出版日期:2014-12-10 发布日期:2014-12-10

Changes of soil microbial biomass carbon and nitrogen along the altitude gradient and its influence factors in Shennongjia Natural Reserve, China.

CONG Jing1,2, LIU Xiao2, LU Hui2, XUE Ya-dong2, LIU Xue-duan1, YIN Hua-qun1, LI Di-qiang2, ZHANG Yu-guang2**   

  1. (1School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China; 2 Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China)
  • Online:2014-12-10 Published:2014-12-10

摘要:

于2011年8月底对神农架自然保护区沿海拔变化的4种林型的土壤微生物生物量碳、氮进行研究,探讨土壤微生物生物量的变化规律和主要的环境影响因子。结果表明:表层土壤(0~10 cm)微生物生物量碳(MBC)和微生物生物量氮(MBN)含量大小顺序均为:亚高山灌丛>寒温带针叶林>针叶落叶阔叶混交林>落叶阔叶林。土壤微生物生物量碳、氮均随海拔的升高而显著增加,与土壤有机碳和全氮的变化趋势一致,而微生物商(qMB)随海拔表现出先减小后增加的趋势。Pearson相关分析表明,土壤微生物生物量碳、氮随海拔的变化趋势与土壤有机碳和土壤全氮呈显著正相关(P<0.05),但与土壤湿度、土壤温度和土壤pH呈显著负相关(P<0.05)。因此,土壤湿度、温度、pH、有机碳和全氮可能是影响土壤微生物生物量碳、氮沿海拔梯度变化的重要因子。
 

关键词: MaxEnt模型, 优势物种, 潜在分布

Abstract:

In order to explore the variation trend of soil microbial biomass carbon (MBC) and nitrogen (MBN) along an elevation gradient and their main controlling factors in a mountain forest region in Shennongjia Natural Reserve, China, MBC and MBN at 0-10 cm soil layer were measured and their relationships with environmental factors were analyzed in four typical forest types in late August of 2011. The results showed that the values of MBC and MBN were in order of alpine shrub > subalpine coniferous forest > coniferous and broadleaf mixed forest > deciduous broadleaved forest. MBC and MBN significantly increased with the elevation (P<0.05), in consistent with the trend of soil organic carbon and total nitrogen. However, soil microbial quotient (qMB) decreased first and then increased with the elevation. Pearson’s correlation analysis showed that MBC and MBN were significantly positively correlated (P<0.05) with soil organic carbon and total nitrogen, but negatively with soil moisture, soil temperature and soil pH (P<0.05). Therefore, soil moisture, soil temperature, soil pH, soil organic carbon and soil total nitrogen might be the important factors influencing the variations of soil microbial biomass along the elevation gradient in Shennongjia Mountain.
 

Key words: potential distribution, MaxEnt model, dominant species