围栏封育对重度退化草地土壤养分和生物活性的影响 - journal of .pdf

第32 卷第3期 东 北 大 学 学 报 ( 自 然 科 学 版 ) Vol32, No. 3 201 1 年 3 月 Journal of Northeastern U ni ersity( Natural Science) Mar. 2 0 1 1 1 1 2 1 曹成有 , 邵建飞 , 蒋德明 , 崔振波 ( 1. , 110819; 2. , 110016) : , 7 pH : , pH , C, N, P , : ; ; ; ; ; : X 825 : A : 1005-3026( 2011) 03-0427-04 Effects of Fence Enclosure on Soil Nutrients and Biological Activities in Highly Degraded Grasslands 1 1 2 1 CA O Cheng-you , SH A O Jian-f ei , JIA N G D e-m ing , C UI Zhen-bo ( 1. School of Sciences, Northeastern Uni ersity, Shenyang 110819, China; 2. Institute of Applied Ecology, Chinese Academy of Sciences, Sheny ang 110016, China. Corresponding author : CA O Cheng-you, professor, E- mail: caochengyou @ 163. com) Abstract: Fence enclosure is a simple and effecti e method for grassland restoration and is w idely used for this purpose in the steppes of north China. Soil pH , nutrients, salt content, microbial biomass, and enzyme acti ity of soils in hea ily degraded grassland in the Horqin area w ere compared w ith an adjacent plot enclosed for 7 years. Fence enclosure decreased soil pH and salt content and increased soil organic matter content, total N and P, and a ailable N and P . M icrobial biomass C, N, and P contents increased along w ith increases in urease, phosphomonoesterase, dehydrogenase, and protease acti ities, w hile polyphenol oxidase acti ity decreased. These results indicate that fence enclosure show s good prospects for grassland soil impro ement in the Horqin area. K