| 摘 要： |
Particulate organic carbon (POC), the active component of soil organic carbon (SOC), is a promising indicator for exploring the response of soil carbon pools to climate change. The purpose of this study was to determine the spatial variation of soil particulate organic carbon and its potential mechanism in three plateau grasslands. Three grassland types are selected along the precipitation gradient on the Mongolian Plateau (MP), Tibetan Plateau (TP), and Loess Plateau (LP): meadow steppe (MS), typical steppe (TS), and desert steppe (DS). The environmental, soil, and microbial factors affecting soil particulate organic carbon were characterized. Environmental factors include mean annual temperature, mean precipitation, and total radiation, soil factors include soil texture, soil pH, and soil bulk density, and microbial factors include bacterial and fungal biomass. The results showed that the content of POC, SOC, and POC/SOC ranged from 0.89 to 17.07 g kg(-1) (mean 4.46), 2.20 to 52.68 g kg(-1) (mean 13.61), and 16.90 to 51.75% (mean 33.78%), respectively. Overall, POC was highest on the TP, followed by that on the MP and LP, ordered as follows: meadow steppe > typical steppe > desert steppe on all three plateaus. The regulation of indirect effects of environment on soil microorganisms and aboveground biomass plays a major role in controlling the change of POC. |
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