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

Research in Cold and Arid Regions 2012年第1期4卷 40-45页

作者： RuiRui Yan ZhiJun Wei XiaoPing Xin HongMei Liu Jing Yang Qiqige Wuren 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 College of Ecology and Environmental Science Inner Mongolia Agricultural University Hohhot Inner Mongolia 010018 China Life Science and Chemistry School at Hulunber College Hailar lnner Mongolia 021008 China

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

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