Influences of various grazing systems on community biomass of a desert grassland in Inner Mongolia,China  

作　　者：RuiRui Yan XiaoPing Xin ZhiJun Wei ShiMin Liu Jing Yang GuiXia Yang 

机构地区：[1]. Rangeland Ecology, Hulunbeir Grassland Ecosystem Research Station, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences. No. 12, Zhongguancun South Street, Beijing 100081, China [2]Rangeland Ecology, Department of Grassland Science, College of Ecological and Environmental Science, Inner Mongolia Agricultural University. No. 306, Zhaowuda Road, Hohhot, Inner Mongolia 010018, China [3]Animal Nutrition Specialist Faculty of Natural and Agricultural Sciences, The University of Western Australia. 35 Stirling Highway, Crawley WA 6009, Australia

出　　处：《Research in Cold and Arid Regions》2012年第4期303-309,共7页寒旱区科学（英文版）

基　　金：funded by basic special funding from the central public welfare scientific research institutes (No.202-21);public sector projects in the Ministry of Agriculture(Nos. 201003019,201003061);scientific and technological innovation and incentive funds of Inner Mongolia autonomous region and major state basic research development program of China (973 Program) (2010CB833502)

摘　　要：This study investigated the effects of various grazing systems, including continuous grazing, rotational grazing, and no-grazing systems, on the community biomass in the Stipa breviflora Griseb desert grassland during the grazing seasons in 2005, 2006, and 2007, based on study sites established in 1999. We found that the seasonal dynamics of the aboveground biomass were quite similar among the three treatments, which reached peak values in period from August to September during each study year. The continuous grazing system reduced the aboveground biomass from 2005 to 2007 under drought conditions, and the rotational grazing and no-grazing systems maintained more aboveground biomass than the continuous grazing system did. The belowground biomass declined with the increase of soil depth among the three treatments, and in the surface 20-cm soil layer it accounted for more than 60% of the total biomass. The belowground biomass was found to be highly correlated with soil depth under rotational grazing. The total belowground biomass within the 0--100-cm soil layer for rotational grazing was sig- nificantly higher than for continuous grazing and no-grazing, and had 15,775 kg/ha more biomass. Our results demonstrate that conservative rotational grazing can alleviate grassland deterioration by reserving more aboveground and belowground biomass than the continuous grazing system does.This study investigated the effects of various grazing systems, including continuous grazing, rotational grazing, and no-grazing systems, on the community biomass in the Stipa breviflora Griseb desert grassland during the grazing seasons in 2005, 2006, and 2007, based on study sites established in 1999. We found that the seasonal dynamics of the aboveground biomass were quite similar among the three treatments, which reached peak values in period from August to September during each study year. The continuous grazing system reduced the aboveground biomass from 2005 to 2007 under drought conditions, and the rotational grazing and no-grazing systems maintained more aboveground biomass than the continuous grazing system did. The belowground biomass declined with the increase of soil depth among the three treatments, and in the surface 20-cm soil layer it accounted for more than 60% of the total biomass. The belowground biomass was found to be highly correlated with soil depth under rotational grazing. The total belowground biomass within the 0--100-cm soil layer for rotational grazing was sig- nificantly higher than for continuous grazing and no-grazing, and had 15,775 kg/ha more biomass. Our results demonstrate that conservative rotational grazing can alleviate grassland deterioration by reserving more aboveground and belowground biomass than the continuous grazing system does.

关 键 词：continuous grazing rotational grazing aboveground biomass belowground biomass Stipa breviJlora Griseb 

分 类 号：S812[农业科学—草业科学] P941.73[农业科学—畜牧学]