scholarly journals Vertical distributions of soil microbial biomass carbon: a global dataset

Data in Brief ◽  
2020 ◽  
Vol 32 ◽  
pp. 106147
Author(s):  
Tingting Sun ◽  
Yugang Wang ◽  
Dafeng Hui ◽  
Xin Jing ◽  
Wenting Feng
Keyword(s):  
Microbial Biomass ◽  
Soil Microbial Biomass ◽  
Microbial Biomass Carbon ◽  
Biomass Carbon ◽  
Soil Microbial ◽  
Soil Microbial Biomass Carbon ◽  
Vertical Distributions

Global patterns of vertical distribution of soil microbial biomass carbon

2020 ◽  
Author(s):  
Wenting Feng ◽  
Tingting Sun ◽  
Yugang Wang ◽  
Xin Jing
Keyword(s):  
Microbial Biomass ◽  
Vertical Distribution ◽  
Soil Microbial Biomass ◽  
Microbial Biomass Carbon ◽  
Soil Profiles ◽  
Biomass Carbon ◽  
Edaphic Factors ◽  
Soil Microbial ◽  
Soil Microbial Biomass Carbon ◽  
Vertical Distributions

<p>Small changes in soil organic carbon (SOC) may have great influences on the climate-carbon cycling feedback. However, there are large uncertainties in predicting the dynamics of SOC in soil profile at the global scale, especially the role of soil microbial biomass in regulating the vertical distribution of SOC. Here, we developed a global database of soil microbial biomass carbon (SMBC), soil microbial quotient (SMQ, the ratio of SMBC to SOC), and SOC from 312 soil profiles, as well as climate, ecosystem type, and edaphic factors associated with these soil profiles. We assessed the global pattern of vertical distributions of SMBC and SMQ and the contributions of climate, ecosystem type, and edaphic factors to their vertical patterns. Our results showed that SMBC and SMQ decreased exponentially with depth, especially in the top 0-40 cm soil. SOC also decreased exponentially with depth but in different magnitudes compared to SMBC and SMQ. Edaphic factors (e.g., soil clay content and C/N ratio) were the most important controls for the vertical distributions of SMBC and SMQ, probably by mediating the preservation of substrates and nutrient supply for microbial growth in soils. Mean annual temperature and ecosystem types (i.e. forests, grasslands, and croplands) exerted weak influences on SMBC and SMQ. Overall, our data synthesis provides quantitative information of how SMBC, SMQ, and SOC changed along soil profiles globally and identifies important factors that influence their vertical distributions. The findings can help improve the prediction of C cycling in the terrestrial ecosystem by integrating the contributions of soil microbial roles in Earth system carbon models.</p>

scholarly journals Soil Aggregation and Organic Carbon Dynamics in Poplar Plantations

Forests ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 508 ◽  
Author(s):  
Zhiwei Ge ◽  
Shuiyuan Fang ◽  
Han Chen ◽  
Rongwei Zhu ◽  
Sili Peng ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Organic Carbon ◽  
Soil Microbial Biomass ◽  
Fine Root ◽  
Microbial Biomass Carbon ◽  
Critical Role ◽  
Stand Age ◽  
Biomass Carbon ◽  
Soil Microbial ◽  
Soil Microbial Biomass Carbon

Soil resident water-stable macroaggregates (diameter (Ø) > 0.25 mm) play a critical role in organic carbon conservation and fertility. However, limited studies have investigated the direct effects of stand development on soil aggregation and its associated mechanisms. Here, we examined the dynamics of soil organic carbon, water-stable macroaggregates, litterfall production, fine-root (Ø < 1 mm) biomass, and soil microbial biomass carbon with stand development in poplar plantations (Populus deltoides L. ‘35’) in Eastern Coastal China, using an age sequence (i.e., five, nine, and 16 years since plantation establishment). We found that the quantity of water-stable macroaggregates and organic carbon content in topsoil (0–10 cm depth) increased significantly with stand age. With increasing stand age, annual aboveground litterfall production did not differ, while fine-root biomass sampled in June, August, and October increased. Further, microbial biomass carbon in the soil increased in June but decreased when sampled in October. Ridge regression analysis revealed that the weighted percentage of small (0.25 mm ≤ Ø < 2 mm) increased with soil microbial biomass carbon, while that of large aggregates (Ø ≥ 2 mm) increased with fine-root biomass as well as microbial biomass carbon. Our results reveal that soil microbial biomass carbon plays a critical role in the formation of both small and large aggregates, while fine roots enhance the formation of large aggregates.

scholarly journals Ratio of soil microbial biomass carbon to soil organic carbon in Himalayan rangeland

2018 ◽  
Vol 2 ◽  
pp. 96-101
Author(s):  
Dil Kumar Limbu ◽  
Madan Koirala
Keyword(s):  
Organic Matter ◽  
Microbial Biomass ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Microbial Biomass ◽  
Microbial Biomass Carbon ◽  
Biomass Carbon ◽  
Soil Microbial ◽  
Soil Microbial Biomass Carbon ◽  
Microbial Carbon

The soil microbial biomass carbon to soil organic carbon ratio is a useful measure to monitor soil organic matter and serves as a sensitive index than soil organic carbon alone. Thus, the objective of this study is to identify and quantify the present status of ratio of soil microbial biomass carbon to soil organic carbon in Himalayan rangeland and to make recommendations for enhancing balance between microbial carbon and organic carbon of the soil. To meet the aforementioned objective, a field study was conducted from 2011 to 2013 following the Walkley-Black, Chromic acid wet oxidation method, and chloroform fumigation method for analysis of microbial carbon and organic carbon respectively. The study showed that the heavily grazed plot had significantly less value of ratio than occasionally grazed and ungrazed plots. The ratio was significantly high on legume seeding plot compared to nonlegume plot, but the ratio was independent of soil depth. Soil microbial biomass appeared to be more responsive than soil organic matter.

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