Effects of the grazing systems on germinable soil seed bank of desert steppe  

作　　者：RuiRui Yan ZhiJun Wei XiaoPing Xin HongMei Liu Jing Yang Qiqige Wuren 

机构地区：[1]Key Laboratory of Resources Remote Sensing and Digital Agriculture, Hulunber Grassland Ecosystem Research Station, Insti- tute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China [2]College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China [3]Life Science and Chemistry School at Hulunber College, Hailar, lnner Mongolia 021008, China

出　　处：《Research in Cold and Arid Regions》2012年第1期40-45,共6页寒旱区科学（英文版）

基　　金：Demonstration of Grass Digital Monitoring,Control and Decision-making Techniques (2008GB23260400);Recovery of Degraded Vegetation in Inner Mongolia and Directed Economic Plants Industrial Growing Base,the Research of Forage Yield Remote Sensing Estimation and Carrying Capacity in Hulunbeir Grassland,the National high Technology Research and Development Program of China(2006AA10Z241);National Science and Technology Support Program (2006BAC01A12,2006BAD16B05-2);Modern Agricultural Technology System of Special Funding

摘　　要：We studied a soil seed bank in the Stipa breviflora desert steppe under three grassland management systems, namely continuous grazing, rotational grazing, and no grazing, from 1999 until 2007. The germinable seed bank species in rotational, continuous and no gazing were 11, 9 and 8 species, respectively. Rotational grazing increased the number of seed bank plant species and perenni- al grasses. The density of germinal soil seed bank was significantly higher in the enclosed area （19,533.33 seeds/m2） than those in rotational （3,233.33 seeds/mz） and continuous grazing areas （2,553.60 seeds/m2）. The vertical distribution of the soil seed bank had a similar trend： 75.06%-83.19% of the seeds are distributed in the top 0-5 cm soil layer, 14.16%-21.68% in the 5-10 cm lay- er, and 2.65%-4.95% in the 10-15 cm layer, which varied between the grazing treatments. Density of the soil seed bank was sig- nificantly higher in the enclosed area, and there was no significant difference between rotational and continuous grazing. The Margalef and Shannon-Wiener indices for the soil seed bank were higher for rotational grazing treatment than for continuous grazing. The Sorensen＇s similarity index for the soil seed bank between the enclosed and rotational grazing areas reached 0.857.We studied a soil seed bank in the Stipa breviflora desert steppe under three grassland management systems, namely continuous grazing, rotational grazing, and no grazing, from 1999 until 2007. The germinable seed bank species in rotational, continuous and no gazing were 11, 9 and 8 species, respectively. Rotational grazing increased the number of seed bank plant species and perenni- al grasses. The density of germinal soil seed bank was significantly higher in the enclosed area （19,533.33 seeds/m2） than those in rotational （3,233.33 seeds/mz） and continuous grazing areas （2,553.60 seeds/m2）. The vertical distribution of the soil seed bank had a similar trend： 75.06%-83.19% of the seeds are distributed in the top 0-5 cm soil layer, 14.16%-21.68% in the 5-10 cm lay- er, and 2.65%-4.95% in the 10-15 cm layer, which varied between the grazing treatments. Density of the soil seed bank was sig- nificantly higher in the enclosed area, and there was no significant difference between rotational and continuous grazing. The Margalef and Shannon-Wiener indices for the soil seed bank were higher for rotational grazing treatment than for continuous grazing. The Sorensen＇s similarity index for the soil seed bank between the enclosed and rotational grazing areas reached 0.857.

关 键 词：grazing system Stipa breviflora desert steppe germinable soil seed bank 

分 类 号：S812[农业科学—草业科学] S812.8[农业科学—畜牧学]