Responses of biomass to the addition of water, nitrogen and phosphorus in Keerqin sandy grassland, Inner Mongolia, China

作     者：YU Zhan-yuan ZENG De-hui JIANG Feng-qi ZHAO Qiong 

作者机构：Daqinggou Ecological Station Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 P.R. China 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2009年第20卷第1期

页      面：23-26页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX1-YW-08-02-02) the National Basic Research Program of China (2007CB106803) the National Science & Technology Pillar Program in the Eleventh Five-year Plan Period (2006BAC01A12 2006BAD26B0201-1) 

主　　题：belowground biomass carbon cycle factorial analysis function group Keerqin sandy land 

摘      要：The effects of water, nitrogen and phosphorus on productivity of sandy grassland were investigated with a fully factorial experi- ment to find out the main factors limiting natural restoration of grassland productivity in the southeastern Keerqin sandy land. In total, eight treatments were designed as water addition （W）, nitrogen fertilizer addition （N）, phosphorus fertilizer addition （P）, water ＋ nitrogen fertilizer addition （WN）, water ＋ phosphorus fertilizer addition （WP）, nitrogen fertilizer ＋ phosphorus fertilizer addition （NP）, water ＋ nitrogen fertilizer ＋ phosphorus fertilizer addition （WNP） and control （CK）. Each treatment was replicated six times and randomly assigned to 48 plots （4 m × 4 m） that were separated by a 2-m buffer. Results show that restoration of productivity is only limited by nitrogen factor for sandy grassland of Keerqin sandy land and not limited by water and phosphorus. Relative to CK plots, the biomass and the aboveground net primary productivity （ANPP） of all the plots added with nitrogen fertilizer were significantly enhanced （P 〈 0.05） in 2005 growing season. Grass root mass is dominant in underground biomass. The present study possibly underestimates net primary productivity of grassland in northern China, due to limitation of underground biomass measurements.