西北林学院学报2011，Vol.26Issue(6)：1-7,7.
黄土丘陵沟壑区不同群落类型对土壤特性及生物量的影响
Effects of Different Vegetation Types on Soil Characteristics and Plant Biomass in the Loess Hilly Region
摘要
Abstract
To investigate the influences of vegetation types on soil moisture, nutrients and biomass, soil water content, organic carbon, total nitrogen, potassium, phosphorus and plant biomass were analyzed under different vegetation types in the Loess hilly region in China. Soil water contents in 0 -100 cm layer varied from 6. 9% to 14. 1%. In abandoned land and land covered with Medicago sativa , the moisture increased with the increase of soil depths, but in land covered with Caragana korshinskii it displayed an opposite trend. In 0 - 20 cm top soil layer, organic carbon and total nitrogen in land covered with different vegetation types showed significant changes in comparison with those in arable land. Phosphorus contents were lower in 0-100 cm layer in land covered with Hippophae rhamnoides and Caragana korshinskii compared to those in arable land. In 0-100 cm layer, soil potassium contents displayed gradual decreases in Medicago sativa, abandoned, arable, Hippophae rhamnoides and Caragana korshinskii lands. Positive linear correlations existed between soil organic carbon and total nitrogen across different vegetation types. Soil carbon to nitrogen ratios increased with the land use changes from arable to lands covered with grasses and shrubs, which indicates soils from grass and shrub lands contained more organic carbon and nitrogen in comparison with that from arable land. Plant biomass showed gradual increases in arable, abandoned,Medicago sativa , Hippophae rhamnoides and Caragana korshinskii lands. These results indicate that herbaceous vegetation restoration promotes water moisture in deep soil and woody vegetation enhances nutrients in top soil.关键词
黄土丘陵沟壑区/植被类型/土壤养分/土壤水分/生物量Key words
Loess hilly region/ vegetation type/ soil nutrient/ soil moisture/ biomass分类
农业科技引用本文复制引用
何亚龙,李刚,龙凌云,李红,龚春梅,梁宗锁,胡景江,罗志斌..黄土丘陵沟壑区不同群落类型对土壤特性及生物量的影响[J].西北林学院学报,2011,26(6):1-7,7.基金项目
中国科学院知识创新工程重要方向项目(KZCX2-YW-443) （KZCX2-YW-443）
教育部新世纪优秀人才支持计划(NCET-08-0468):西北农林科技大学人才基金项目 （NCET-08-0468）
