C:N:P stoichiometry in soil:: is there a "Redfield ratio" for the microbial biomass?
C:N:P stoichiometry in soil:: is there a "Redfield ratio" for the microbial biomass?
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DOI：
10.1007/s10533-007-9132-0
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发表时间：
2007-09-01
期刊：
影响因子：
4
通讯作者：
Liptzin, Daniel
中科院分区：
文献类型：
--
作者：
Cleveland, Cory C.;Liptzin, Daniel
严格限制的碳：氮：磷（C：N：P）的比例在浮游生物量，以及他们的重要性，在推进我们的生物过程和海洋生态系统中的营养循环的理解，促使生态学家在陆地生态系统中寻找类似的模式。最近的分析表明，存在的“雷德菲尔德”的比例在植物中，这样的数据可能会提供洞察陆地生态系统中的营养限制的性质。我们通过对文献的回顾，在土壤和土壤微生物生物量中寻找类似的模式。虽然土壤的特点是高生物多样性，结构复杂性和空间异质性，我们发现显着一致的C：N：P的比例在两个总土壤库和土壤微生物生物量。我们的分析表明，与海洋浮游植物相似，土壤微生物群落中各个系统发育组的元素浓度可能会有所不同，但平均而言，土壤（186：13：1）和土壤微生物生物量（60：7：1）中的原子C：N：P比值在全球范围内受到很好的限制。我们确实看到了植被类型之间土壤和微生物元素比率的显著变化（即，森林与草地），但在大多数情况下，土壤和微生物元素的比例之间的网站和大尺度上的相似性比差异更明显。一致的微生物生物量元素的比例，结合微生物元素的化学计量与微生物营养限制的直接证据的具体模式的数据，表明，测量微生物生物量中的C，N和P的比例可能是另一个有用的工具，用于评估陆地生态系统中的生态系统过程的营养限制。
Well-constrained carbon:nitrogen:phosphorus (C:N:P) ratios in planktonic biomass, and their importance in advancing our understanding of biological processes and nutrient cycling in marine ecosystems, has motivated ecologists to search for similar patterns in terrestrial ecosystems. Recent analyses indicate the existence of "Redfield-like" ratios in plants, and such data may provide insight into the nature of nutrient limitation in terrestrial ecosystems. We searched for analogous patterns in the soil and the soil microbial biomass by conducting a review of the literature. Although soil is characterized by high biological diversity, structural complexity and spatial heterogeneity, we found remarkably consistent C:N:P ratios in both total soil pools and the soil microbial biomass. Our analysis indicates that, similar to marine phytoplankton, element concentrations of individual phylogenetic groups within the soil microbial community may vary, but on average, atomic C:N:P ratios in both the soil (186:13:1) and the soil microbial biomass (60:7:1) are well-constrained at the global scale. We did see significant variation in soil and microbial element ratios between vegetation types (i.e., forest versus grassland), but in most cases, the similarities in soil and microbial element ratios among sites and across large scales were more apparent than the differences. Consistent microbial biomass element ratios, combined with data linking specific patterns of microbial element stoichiometry with direct evidence of microbial nutrient limitation, suggest that measuring the proportions of C, N and P in the microbial biomass may represent another useful tool for assessing nutrient limitation of ecosystem processes in terrestrial ecosystems.