中国沙漠 ›› 2019, Vol. 39 ›› Issue (5): 71-79.DOI: 10.7522/j.issn.1000-694X.2018.00087

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吕星宇1,2, 张志山1   

  1. 1. 中国科学院西北生态环境资源研究院 沙坡头沙漠研究试验站, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2018-05-30 修回日期:2018-09-14 出版日期:2019-09-29 发布日期:2019-09-29
  • 通讯作者: 张志山(
  • 作者简介:吕星宇(1993-),女,甘肃兰州人,硕士研究生,研究方向为生态学。
  • 基金资助:

Recovery of Soil Microbe Quantities Dependent on Fine Particle Contents after Establishment of Sand-fixing Revegetation in Desert Region

Lv Xingyu1,2, Zhang Zhishan1   

  1. 1. Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-05-30 Revised:2018-09-14 Online:2019-09-29 Published:2019-09-29

摘要: 土壤微生物是荒漠生态系统的重要组分,参与成土过程与生物地球化学循环,其数量反映土壤质量,是判别退化生态系统恢复程度的重要指标。选取沙坡头固沙植被区土壤中的真菌、细菌、放线菌数量进行研究,分析了其时空分布、恢复特征及影响因子。结果表明:土壤微生物数量随固沙年限增加而增加,随土层深度增加而减少,夏秋季显著大于冬春季。三大类群微生物数量恢复曲线均呈现S型,在固沙植被建立18~24 a后恢复速率达到峰值,24~36 a后数量能够达到天然植被区的31.6%~83.7%。土壤微生物数量恢复过程主要受土壤细物质含量的影响,土壤pH是限制因子。土壤微生物对土壤状况与覆被变化敏感,能较早且敏感地指示生态系统功能的变化。

关键词: 固沙植被, 微生物数量, 恢复, 时空格局, 通径分析

Abstract: As an important component of desert ecosystem, soil microbes participate in the processes of soil-forming and biogeochemical cycle. Soil microbe quantities reflecting soil quality is an important index which can be used to determine the recovery degree of degraded ecosystems. We studied the quantities of fungi, bacteria, and actinomycetes with a restoration chronosequence in Shapotou sand-binding revegetation area, and analyzed their temporal and spatial distributions, recovery characteristics and their impact factors. The results showed that soil microbe quantities increase with increasing age of revegetation and soil depth. In general, soil microbe quantities were higher in summer and autumn than those in spring and winter. The recovery processes of microbe quantities followed S shape curve that the recovery rates reached to the maximum 18 to 24 years after the establishment of sand-fixing vegetation, and the microbe quantities reached to 31.6% to 83.7% of the natural vegetation area 24 to 36 years after the establishment. The microbe recovery processes were primarily influenced by the fine particle contents of soil and limited by soil pH. The results meant that soil microbes were sensitive to soil conditions and vegetation cover, and their fluctuation could make an early and sensitive indication of the changes in ecosystem functions.

Key words: sand-fixing revegetation, soil microbe quantities, recovery, temporal and spatial distributions, path analysis