植物生态学报 ›› 2019, Vol. 43 ›› Issue (6): 532-542.DOI: 10.17521/cjpe.2019.0075

• 研究论文 • 上一篇    下一篇

全球森林土壤微生物生物量碳氮磷化学计量的季节动态

李品1,*(),木勒德尔•吐尔汗拜2,田地2,冯兆忠1   

  1. 1 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085
    2 首都师范大学生命科学学院, 北京 100048
  • 收稿日期:2019-04-04 修回日期:2019-06-12 出版日期:2019-06-20 发布日期:2019-09-30
  • 通讯作者: 李品ORCID:0000-0003-2289-9240
  • 基金资助:
    国家自然科学基金(31870458);中国科学院前沿科学重点研究项目(QYZDB-SSW-DQC019)

Seasonal dynamics of soil microbial biomass carbon, nitrogen and phosphorus stoichiometry across global forest ecosystems

LI Pin1,*(),Muledeer TUERHANBAI2,TIAN Di2,FENG Zhao-Zhong1   

  1. 1 State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
    2 College of Life Sciences, Capital Normal University, Beijing 100048, China
  • Received:2019-04-04 Revised:2019-06-12 Online:2019-06-20 Published:2019-09-30
  • Contact: LI PinORCID:0000-0003-2289-9240
  • Supported by:
    Supported by the National Natural Science Foundation of China(31870458);the Key Research Program of Frontier Sciences, Chinese Academy of Sciences(QYZDB-SSW-DQC019)

摘要:

土壤微生物生物量在森林生态系统中充当具有生物活性的养分积累和储存库。土壤微生物转化有机质为植物提供可利用养分, 与植物的相互作用维系着陆地生态系统的生态功能。同时, 土壤微生物也与植物争夺营养元素, 在季节交替过程和植物的生长周期中呈现出复杂的互利-竞争关系。综合全球数据对温带、亚热带和热带森林土壤微生物生物量碳(C)、氮(N)、磷(P)含量及其化学计量比值的季节动态进行分析, 发现温带和亚热带森林的土壤微生物生物量C、N、P含量均呈现夏季低、冬季高的格局。热带森林四季的土壤微生物生物量C、N、P含量都低于温带和亚热带森林, 且热带森林土壤微生物生物量C含量、N含量在秋季相对最低, 土壤微生物生物量P含量四季都相对恒定。温带森林的土壤微生物生物量C:N在春季显著高于其他两个森林类型; 热带森林的土壤微生物生物量C:N在秋季显著高于其他2个森林类型。温带森林土壤微生物生物量N:P和C:P在四季都保持相对恒定, 而热带森林土壤微生物生物量N:P和C:P在夏季高于其他3个季节。阔叶树的土壤微生物生物量C含量、N含量、N:P、C:P在四季都显著高于针叶树; 而针叶树的土壤微生物生物量P含量在四季都显著高于阔叶树。在春季和冬季时, 土壤微生物生物量C:N在阔叶树和针叶树之间都没有显著差异; 但是在夏季和秋季, 针叶树的土壤微生物生物量C:N显著高于阔叶树。对于土壤微生物生物量的变化来说, 森林类型是主要的显著影响因子, 季节不是显著影响因子, 暗示土壤微生物生物量的季节波动是随着植物其内在固有的周期变化而变化。植物和土壤微生物密切作用表现出来的对养分的不同步吸收是保留养分和维持生态功能的一种权衡机制。

关键词: 微生物生物量碳, 微生物生物量氮, 微生物生物量磷, 森林土壤, 季节变化, 化学计量比

Abstract:

Aims Soil microorganisms in forest ecosystems play vital roles in regulating above- and belowground ecosystem processes and functions such as soil nutrient cycling, litter decomposition, net ecosystem productivity, and ecosystem succession. We aim to investigate broad-scale seasonal patterns of soil microbial biomass carbon (C), nitrogen (N) and phosphorus (P) stoichiometry. Methods By synthesizing 164 samples of soil microbial biomass C, N and P content derived from the published literature, we investigated global seasonal patterns of soil microbial C, N, P content and their ratios across three vegetation types of global forests. Important findings Soil microbial biomass C, N and P content in temperate and subtropical forests were lower in summer and higher in winter. Soil microbial biomass C, N and P content in tropical forests were lower than those in temperate and subtropical forests in four seasons. Soil microbial biomass C and N content in tropical forests were relatively the lowest in autumn, and soil microbial biomass P content was relatively constant in all seasons. The soil microbial biomass C:N of temperate forest was significantly higher than that of other two forest types in spring, and that of tropical forest was significantly higher than that of other two forest types in autumn. Soil microbial biomass N:P and C:P in temperate forests remained relatively constant in four seasons, while those in tropical forests were higher than those in other three seasons in summer. The soil microbial biomass C content, N content, N:P and C:P of broad-leaved trees were significantly higher than those of conifers in four seasons, while the soil microbial biomass P content of conifers was significantly higher than that of broad-leaved trees in four seasons. There was no significant difference in soil microbial biomass C:N between broad-leaved and coniferous trees in both spring and winter, but the soil microbial biomass C:N of coniferous trees was significantly higher than that of broad-leaved trees in summer and autumn. For the change of soil microbial biomass, season is not but forest type is the main significant factor, suggesting that the seasonal fluctuation of soil microbial biomass changes with the inherent periodic change of trees. Asynchronous nutrient uptake by plants and soil microorganisms is a trade-off mechanism between nutrient retention and ecological function maintenance.

Key words: microbial biomass carbon, microbial biomass nitrogen, microbial biomass phosphorus, forest soil, seasonal dynamics, stoichiometric ratio