Microbial responses to temperature sensitivity of soil respiration in a dry fallow cover cropping and submerged rice mono-cropping system
| Autor: | Pil Joo Kim, Hyun Young Hwang, Gil Won Kim, Muhammad Israr Khan, Suvendu Das |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Limiting factor
Biomass (ecology) 010504 meteorology & atmospheric sciences Ecology Monocropping fungi Q10 food and beverages Soil Science 04 agricultural and veterinary sciences Soil carbon 01 natural sciences Agricultural and Biological Sciences (miscellaneous) Soil respiration Microbial population biology Agronomy cardiovascular system 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science cardiovascular diseases Cover crop 0105 earth and related environmental sciences |
| Zdroj: | Applied Soil Ecology. 128:98-108 |
| ISSN: | 0929-1393 |
| Popis: | Soil heterotrophic respiration (SHR) increases exponentially with temperature and this general information has been incorporated into soil carbon models. However, the positive feedback of warming to SHR remains uncertain, mostly due to the differential response of soil microbial community to warming under dry and flooded conditions in a rice mono-cropping system. In this study, we aimed to evaluate the relationship between SHR and microbial functional groups during the fallow and flooded rice cultivation seasons under changing temperature in a rice mono-cropping system. Field experiments were conducted to investigate SHR, soil microbial functional groups and biomass, and temperature sensitivity of SHR (Q10) under dry fallow conditions during the cover cropping season and under flooded conditions during the rice cropping season. We found that SHR increased with increasing air and soil temperature, carbon availability, and soil microbial community composition and biomass in the fallow season, whereas a decrease in SHR in spite of an increase in temperature and carbon availability was observed under flooded conditions during the rice cropping season. Furthermore, a nonlinear response of microbial community composition and biomass with SHR was noticed during the flooded rice cropping season. This suggests that flooding could be the limiting factor for temperature sensitivity of SHR as well as microbial community composition in a rice mono-cropping system. Flooding the soil significantly (p |
| Databáze: | OpenAIRE |
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