Climate, soil mineralogy and mycorrhizal fungi influence soil organic matter fractions in eastern US temperate forests
Climate, soil mineralogy and mycorrhizal fungi influence soil organic matter fractions in eastern US temperate forests
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气候、土壤矿物学和菌根真菌影响美国东部温带森林的土壤有机质成分
DOI：
10.1111/1365-2745.14094
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发表时间：
2023
影响因子：
5.5
通讯作者：
Phillips, Richard P.
中科院分区：
文献类型：
--
作者：
Lang, Ashley K.;Pett‐Ridge, Jennifer;McFarlane, Karis J.;Phillips, Richard P.
确定土壤中颗粒物（POM）和矿物相关有机物（MAOM）含量的主要控制因素对于确定地球仪未来土壤碳（C）和氮（N）储量至关重要。然而，这些土壤有机质组分的驱动程序很可能会有所不同的生态系统，在应对气候，土壤类型和当地的生物community.We的组成测试如何土壤因素，气候和植物真菌协会影响的分布和浓度的C和N的MAOM和POM在7个温带森林在美国东部的国家生态观测网络（氖）。在每个森林中的上层矿物土壤样品被收集在代表优势树木-菌根协会梯度的地块中，使我们能够测试植物和微生物群落如何影响不同气候和土壤条件的站点的POM和MAOM。我们发现，土壤有机质中的C和N浓度主要受土壤矿物学的影响，但MAOM与POM C的相对丰度与地块水平的菌根优势密切相关。此外，占主导地位的树木菌根类型对POM和MAOM组分之间的N分配的影响对当地气候敏感：在较冷的地点，外生菌根相关树木的比例增加与MAOM中N的比例较低有关，但在较温暖的地点，我们发现相反。作为土壤碳年龄的指标，我们测量了MAOM组分中的放射性碳，但发现在站点内和站点之间，Δ 14 C与菌根优势，气候或土壤因素无关，这表明其他特定站点因素可能是长期SOM持续性的主要决定因素。我们的研究结果表明，虽然土壤矿物学主要控制SOM的C和N浓度，SOM之间的分布密度组分取决于植被和微生物群落的组成，这些影响不同的网站与不同的气候。我们还认为，在生物群落中，矿物相关土壤碳的年龄与控制MAOM C和N浓度的因素没有明显联系。
Identifying the primary controls of particulate (POM) and mineral‐associated organic matter (MAOM) content in soils is critical for determining future stocks of soil carbon (C) and nitrogen (N) across the globe. However, drivers of these soil organic matter fractions are likely to vary among ecosystems in response to climate, soil type and the composition of local biological communities.We tested how soil factors, climate and plant–fungal associations influenced the distribution and concentrations of C and N in MAOM and POM in seven temperate forests in the National Ecological Observatory Network (NEON) across the eastern United States. Samples of upper mineral horizon soil within each forest were collected in plots representing a gradient of dominant tree–mycorrhizal association, allowing us to test how plant and microbial communities influenced POM and MAOM across sites differing in climate and soil conditions.We found that concentrations of C and N in soil organic matter were primarily driven by soil mineralogy, but the relative abundance of MAOM versus POM C was strongly linked to plot‐level mycorrhizal dominance. Furthermore, the effect of dominant tree mycorrhizal type on the distribution of N among POM and MAOM fractions was sensitive to local climate: in cooler sites, an increasing proportion of ectomycorrhizal‐associated trees was associated with lower proportions of N in MAOM, but in warmer sites, we found the reverse. As an indicator of soil carbon age, we measured radiocarbon in the MAOM fraction but found that within and across sites, Δ14C was unrelated to mycorrhizal dominance, climate, or soil factors, suggesting that additional site‐specific factors may be primary determinants of long‐term SOM persistence.Synthesis. Our results indicate that while soil mineralogy primarily controls SOM C and N concentrations, the distribution of SOM among density fractions depends on the composition of vegetation and microbial communities, with these effects varying across sites with distinct climates. We also suggest that within biomes, the age of mineral‐associated soil carbon is not clearly linked to the factors that control concentrations of MAOM C and N.
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影响因子：
3.6
作者：
Carteron, Alexis;Beigas, Marie;Laliberte, Etienne
通讯作者：
Laliberte, Etienne
影响因子：
4
作者：
Jones, Andrew R.;Sanderman, Jonathan;Schmidt, Susanne
通讯作者：
Schmidt, Susanne
影响因子：
5.2
作者：
N. Sokol;E. Whalen;Andrea Jilling;C. Kallenbach;J. Pett‐Ridge;K. Georgiou
通讯作者：
N. Sokol;E. Whalen;Andrea Jilling;C. Kallenbach;J. Pett‐Ridge;K. Georgiou
生物 12C–13C 分馏随着土壤微观世界中群落复杂性的增加而增加
影响因子：
9.7
作者：
Weijun Yang;J. Magid;S. Christensen;R. Rønn;P. Ambus;F. Ekelund
通讯作者：
F. Ekelund
使用 14C 标签量化生态系统-大气碳交换
DOI：
10.1029/2002eo000187
发表时间：
2002
期刊：
Eos, Transactions American Geophysical Union
影响因子：
--
作者：
S. Trumbore;J. Gaudinski;P. Hanson;J. Southon
通讯作者：
J. Southon