Grasslands and Croplands Have Different Microbial Biomass Carbon Levels per Unit of Soil Organic Carbon
| Autor: | William G. Turner, Terence P. McGonigle |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
active fraction
010504 meteorology & atmospheric sciences soil health soil quality meta-analysis organic matter linear regression Plant Science complex mixtures 01 natural sciences Grassland Temperate climate Organic matter lcsh:Agriculture (General) 0105 earth and related environmental sciences chemistry.chemical_classification Soil health geography geography.geographical_feature_category food and beverages 04 agricultural and veterinary sciences Soil carbon lcsh:S1-972 Soil quality Biomass carbon chemistry Agronomy Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Agronomy and Crop Science Food Science |
| Zdroj: | Agriculture; Volume 7; Issue 7; Pages: 57 Agriculture, Vol 7, Iss 7, p 57 (2017) |
| ISSN: | 2077-0472 |
| DOI: | 10.3390/agriculture7070057 |
| Popis: | Primarily using cropped systems, previous studies have reported a positive linear relationship between microbial biomass carbon (MBC) and soil organic carbon (SOC). We conducted a meta-analysis to explore this relationship separately for grasslands and croplands using available literature. Studies were limited to those using fumigation–extraction for MBC for field samples. Trials were noted separately where records were distinct in space or time. Grasslands were naturally occurring, restored, or seeded. Cropping systems were typical of the temperate zone. MBC had a positive linear response to increasing SOC that was significant in both grasslands (p < 0.001; r2 = 0.76) and croplands (p < 0.001; r2 = 0.48). However, MBC increased 2.5-fold more steeply per unit of increasing SOC for grassland soils, as compared to the corresponding response in cropland soils. Expressing MBC as a proportion of SOC across the regression overall, slopes corresponded to 2.7% for grasslands and 1.1% for croplands. The slope of the linear relationship for grasslands was significantly (p = 0.0013) steeper than for croplands. The difference between the two systems is possibly caused by a greater proportion of SOC in grasslands being active rather than passive, relative to that in croplands, with that active fraction promoting the formation of MBC. |
| Databáze: | OpenAIRE |
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