Effects of Land Use Type on Soil Aggregate Stability and its Stoichiometric Characteristics in Hilly Region of West Henan Province
To explore the effect of different land use types on the composition and C,N,P stoichiometric characteristics of soil aggregates,the same parent material of alluvial soil from 4 land use types including orchard,forestland,grassland and farmland in hilly region of west Henan province were determinated and analyzed with the stability,C content,N content,P content and its stoichiometric characteristics of soil aggregates.The results indicat that the size scale of 0.25～2 mm soil aggregate is predominant and the mass fraction ranges from 58.49%to 66.11%in 4 land use types while farmland is the highest,soil aggregates stability shows farmland>forestland>grassland and orchard.The content(expressed in mass ratio)of organic carbon render descending trend along with aggregate size declining.The organic carbon content of orchard is significantly higher than other 3 land use types at 4 aggregate size scales,soil organic carbon contents at 2 aggregates size scales which less than 2 mm show a significant decreasing trend by orchard,farmland,forestland and grassland.C/N and C/P in orchard are significantly higher than forestland,grassland and farmland.C/N at 3 aggregates size scales which less than 2mm in forestland are significantly lower than grassland and farmland while C/P and N/P at aggregates size scales which less than 2mm are significantly higher than grassland.The soil aggregate stability and stoichiometric characteristics are considerably affected by land use type.The aggregate stability in farmland is the highest among 4 land use types,high organic inputting appears in orchard,forestland is restricted by P and grassland is restricted by N.
land use typesoil aggregatestoichiometric characteristichilly region
国家科技期刊平台
NSTL
万方数据
