Dynamics of Community Biomass and Soil Nutrients in the Process of Vegetation Succession of Abandoned Farmland in the Loess Plateau

The interaction between vegetation and soil is important for restoration reconstruction during the succession of abandoned farmland. We chose four kinds farmlands with time 1, 6, 12, 22 years to experiment in Loess Plateau. community composition, biomass, nutrients were studied by method temporal–spatial alternation, effects among vegetation, nutrients, abandonment analyzed. results showed there 33 species belonging 13 families 15 Gramineae Compositae, accounting 47% total species. trend farmland was as follows: weed Heteropappus altaicus + Artemisia capillaris beginning stage became Tragus racemosus Enneapogon borealis after 6 abandonment. Then, Leymus secalinus dominant population 12 When lasted years, a common advantageous Stipa breviflora Cleistogenes songorica . Soil moisture (SM) positively correlated negatively biomass. organic matter (SOM), nitrogen (STN), alkali hydrolyzable (AHN) highest 0–10 cm layer, showing obvious surface accumulation. three decreased positive correlation them. had effect on above-ground biomass (AGB) below-ground (BGB) negative SOM, STN, AHN. root/shoot ratio (R/S) SOM time. With progress succession, hierarchical differentiation gradually obvious, structure begun complicate. better adapted arid environment toward local top succession.