Response of soil labile organic carbon fractions to forest conversions in subtropical China
نویسندگان
چکیده
In order to determine the impact of forest conversions on labile organic carbon fractions, soils at depths of 0 10, 10 30 and 30 50 cm were collected from three types of forest: secondary monsoon evergreen broadleaved forest (BF), mixed pine and broadleaved forest (MF) and Masson pine forest (PF) in subtropical China. The light fraction organic carbon (LFOC), particulate organic carbon (POC) and microbial biomass carbon (MBC) in the soils were determined. The results showed that soils, the top soils (at depths of 0 10 cm) in particular, in BF had significantly higher LFOC, POC and MBC than those in MF and PF, indicating that forest conversions influenced the labile organic carbon fractions in subtropical China, and this influence mainly occurred in the top soils. The significantly higher ratios of labile organic carbon to soil organic carbon in BF than those in MF and PF confirmed that forest conversions from BF to MF could lead to a considerable reduction in soil labile organic carbon. In all three types of forest, the reduction of soil organic carbon in the rainy season was higher than that in the dry season.
منابع مشابه
Effects of nitrogen deposition on soil organic carbon fractions in the subtropical forest ecosystems of S China
Experiments were conducted between 2003 and 2008 to examine how N additions influence soil organic C (SOC) and its fractions in forests at different succession stages in the subtropical China. The succession stages included pine forest, pine and broadleaf mixed forest, and oldgrowth monsoon evergreen broadleaf forest. Three levels of N (NH4NO3)-addition treatments comprising control, low-N (50 ...
متن کاملSoil Organic Carbon in Particle Size and Density Fractionations under Four Forest Vegetation-Land Use Types in Subtropical China
Data on the effect of vegetation and land use type on soil organic carbon (SOC) distribution in particle-size and density fractions in the subtropical forest region in China will improve our understanding of the C sequestration potential of those different vegetation-land use types. We quantified SOC in particle size (coarse, medium and fine) and density fractions (light and heavy) under four t...
متن کاملSoil properties, labile pools of soil organic carbon and their variations under broadleaf and coniferous plantation in Hyrcanian forest, northern Iran
Afforestation, as a tool to mitigate carbon emission is constrained by available land areain several countries, but Iran has the potential of plantation. In doing so, differences in soilstocks between tree species could give an indication of the effects of future managementchanges. Hence, a better understanding of tree species traits on soil properties is required topredict how changes in ecosy...
متن کاملAssociation of Soil Aggregation with the Distribution and Quality of Organic Carbon in Soil along an Elevation Gradient on Wuyi Mountain in China
Forest soils play a critical role in the sequestration of atmospheric CO2 and subsequent attenuation of global warming. The nature and properties of organic matter in soils have an influence on the sequestration of carbon. In this study, soils were collected from representative forestlands, including a subtropical evergreen broad-leaved forest (EBF), a coniferous forest (CF), a subalpine dwarf ...
متن کاملThe temperature sensitivity of soil organic carbon decomposition is not related to labile and recalcitrant carbon
The response of resistant soil organic matter to temperature change is crucial for predicting climate change impacts on C cycling in terrestrial ecosystems. However, the response of the decomposition of different soil organic carbon (SOC) fractions to temperature is still under debate. To investigate whether the labile and resistant SOC components have different temperature sensitivities, soil ...
متن کامل