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广西十万大山地区不同植被类型土壤微生物特征

孙英杰,何成新,徐广平,莫凌,顾大形,姚月锋,黄玉清**   

  1. (广西壮族自治区中国科学院广西植物研究所, 广西喀斯特植物保育与恢复生态学重点实验室, 广西桂林 541006)
  • 出版日期:2015-02-07 发布日期:2015-02-07

Soil microbial properties under different vegetation types in Shiwan Mountain, Guangxi Province.

SUN Ying-jie, HE Cheng-xin, XU Guang-ping, MO Ling, GU Da-xing, YAO Yue-feng, HUANG Yu-qing**   

  1. (Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Chinese Academy of Sciences, Guilin 541006, Guangxi, China)
  • Online:2015-02-07 Published:2015-02-07

摘要: 为研究广西十万大山地区热带不同植被类型土壤微生物特征及其与土壤养分之间的关系,对次生阔叶林、马尾松林、灌草丛和撂荒地的土壤理化性质、微生物数量特征及微生物生物量碳氮磷进行了测定。结果表明:相同土层的土壤微生物总数大小依次为:次生阔叶林>马尾松林>灌草丛>撂荒地,并随土壤深度增加而减少。土壤微生物生物量碳氮磷随土壤深度的增加而逐渐降低,在不同植被类型的土壤中差异显著。次生阔叶林、马尾松林、灌草丛的土壤微生物生物量与土壤养分呈极显著相关,而撂荒地的相关性明显低于其他3种植被类型,并且其土壤微生物生物量磷与全氮、速效氮和速效钾含量无相关性。由此可见,土壤微生物数量和微生物生物量均可作为评价十万大山森林生态系统土壤肥力的指标;可采用植被恢复手段促进土壤微生物群落的发育、改良土壤特性以促进该区域退化生态系统的恢复。

关键词: 大陆样点, 物种多样性, 陆桥岛屿, 生境片段化, 地表甲虫

Abstract: To investigate soil microbial properties and their correlation with soil nutrients under different tropical vegetation types in Shiwan Dashan Mountain, Guangxi, China, the soil physicochemical properties, microbial quantity and microbial biomass carbon, nitrogen and phosphorus of secondary broadleaved forest, masson pine forest, shrubgrassland and abandoned land were comparatively analyzed. The results indicated that the number of total microbes in the same soil layer followed the order of secondary broadleaved forest > masson pine forest > shrubgrassland > abandoned land, and it decreased with the increasing soil depth. Soil microbial biomass carbon, nitrogen and phosphorus decreased with the increasing soil depth, and significant differences existed among the different vegetation types. Soil microbial biomass showed significant relationships with soil nutrients in secondary broadleaved forest, masson pine forest and shrubgrassland. Such relationships in the abandoned land were obviously lower than in the other three vegetation types. Moreover, soil microbial biomass phosphorus had no correlation with total nitrogen, available nitrogen and potassium in the abandoned land. Therefore, the number of soil microbes and soil microbial biomass can be used as indicators to evaluate soil fertility of forest ecosystem in Shiwan Mountain, Guangxi. Revegetation should be adopted to facilitate the development of soil microbial communities and improve soil characteristics, so as to promote the rehabilitation of the degraded ecosystems.

Key words: land-bridge island, ground dwelling beetles, species diversity, mainland study site, habitat fragmentation