Plant Community Biomass Trade-off and Its Influencing Factors for Different Years of Abandoned Cropland in a Typical Steppe
Analysis of above-and belowground vegetation biomass can reveal plant adaptation strate-gies under environmental stress.Uncontrolled human activities have degraded vast area of grassland in China.The Grain to Green Program was implemented to restore these ecosystems.This study investi-gated above-and belowground biomass,community species composition and the relative biomass,plant richness and diversity indexes,and soil physical and chemical properties across three abandoned croplands with different recovery times(5,15 and 20 years)and a reference natural grassland site.The aim was to explore plant community trade-off and its influencing factors during the restoration of abandoned cropland.The results showed that abandoned croplands exhibited a shift in community structure from annuals-and biennials-dominated to perennial-dominated assemblages over time,with increasing plant species diver-sity.Interestingly,aboveground biomass dominated total biomass across all abandoned cropland ages,though it increased first and decreased with increasing recovery time.In contrast,the natural grassland dis-played a belowground allocation pattern.Soil moisture and biomass of annual-and biennial plants emerged as the key drivers of biomass trade-off.
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