期刊
ECOLOGICAL MONOGRAPHS
卷 87, 期 3, 页码 429-441出版社
WILEY
DOI: 10.1002/ecm.1258
关键词
basal respiration; edaphic factor; meteorology; microbial metabolic quotient; pH; soil microbial biomass
类别
资金
- San Diego State University
- University of Texas at El Paso
- SPRUCE project - Office of Biological and Environmental Research in the Department of Energy Office of Science
- NGEE Arctic project - Office of Biological and Environmental Research in the Department of Energy Office of Science
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences
- U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research
- U.S. Department of Energy [DE-AC05-00OR22725]
- National Natural Science Foundation of China [41125001]
- European Research Council [ERC-2013-SyG 675 610028 IMBALANCE-P]
The microbial metabolic quotient (MMQ), microbial respiration per unit of biomass, is a fundamental factor controlling heterotrophic respiration, the largest carbon flux in soils. The magnitude and controls of MMQ at regional scale remain uncertain. We compiled a comprehensive data set of MMQ to investigate the global patterns and controls of MMQ in top 30cm soils. Published MMQ values, generally measured in laboratory microcosms, were adjusted on ambient soil temperature using long-term (30yr) average site soil temperature and a Q(10)=2. The area-weighted global average of MMQ_Soil is estimated as 1.8 (1.5-2.2) (95% confidence interval) molCh(-1)mmol(-1) microbial biomass carbon (MBC) with substantial variations across biomes and between cropland and natural ecosystems. Variation was most closely associated with biological factors, followed by edaphic and meteorological parameters. MMQ_Soil was greatest in sandy clay and sandy clay loam and showed a pH maximum of 6.7 +/- 0.1 (mean +/- se). At large scale, MMQ_Soil varied with latitude and mean annual temperature (MAT), and was negatively correlated with microbial N:P ratio, supporting growth rate theory. These trends led to large differences in MMQ_Soil between natural ecosystems and cropland. When MMQ was adjusted to 11 degrees C (MMQ_Ref), the global MAT in the top 30cm of soils, the area-weighted global averages of MMQ_Ref was 1.5 (1.3-1.8) molCmmolMBC(-1)h(-1). The values, trends, and controls of MMQ_Soil add to our understanding of soil microbial influences on soil carbon cycling and could be used to represent microbial activity in global carbon models.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据