| 生物土壤与生态 |
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| Study on Biomass and Energy Allocation of Major Plant Species in Desert Steppe under Different Grazing Systems |
| WEI Zhi-jun1, YAN Rui-rui1,2, YUN Xiang-jun1, CHU Wen-bin1, YANG Jing1 |
| 1.College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot 010018, China; 2.Hulunber Grassland Ecosystem Research Station/Laboratory of Grassland Science, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract Effects of different grazing systems, continuous and rotational grazing, on biomass and energy allocation of main organs of dominant plant species, Stipa breviflora, Cleistogenes songorica and Allium polyhizum, in desert steppe of Sunite Right Banner of Inner Mongolia were investigated. Results show that non-grazing and rotational grazing are beneficial to plant growth and sexual reproduction; much resource and energy are used for vegetative growth, but sexual reproduction is seriously prohibited for S. breviflora and C. songorica under continuous grazing system; rotational grazing increases tiller nodes biomass of A. polyhizum, energy of standing crop and total standing crop of population organs of S. breviflora and A. polyhizum; biomass, standing crop of energy, allocation proportion of roots, and ratio of root to crown of the dominant plant species in rotational and continuous grazing plots are higher than that in non-grazing plots; and thermal energy per unit of main organs and whole plants of dominant species in the desert steppe in rotational grazing plots are higher than that in continuous grazing. There is no significantly oppositional relationship between biomass and energy of vegetative shoot and reproductive branches, but significantly oppositional relationship between tiller nodes and vegetative shoots is observed in this study.
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Received: 22 December 2010
Published: 20 September 2011
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2011, Vol. 31 
