SUN Fei-da,LONG Rui-jun,GAN You-min.Effects of Plateau Pikas (Ochotona curzoniae) Activities on Plant Biomass Seasonal Distribution of Alpine Meadow Population[J].Research of Soil and Water Conservation,2010,17(02):204-207,211.
高原鼠兔活动对高寒草甸群落植物生物量季节分布的影响
- Title:
- Effects of Plateau Pikas (Ochotona curzoniae) Activities on Plant Biomass Seasonal Distribution of Alpine Meadow Population
- Keywords:
- Plateau pikas(Ochotona curzoniae); burrowing rodents densities; alpine meadow; plant biomass; seasonal distribution
- 分类号:
- Q948.1
- 摘要:
- 通过对高原鼠兔不同洞穴密度条件下，三江源区高寒草甸植物群落生物量季节动态研究分析表明：高原鼠兔不同洞穴密度和植物地上、地下和总生物量均满足二次函数关系，当洞穴数量达到中等密度时（512个/hm2），其生物量降到最低。生长季内（5-10月）地上生物量变化呈“单峰”曲线，由于不同程度的鼠类活动致使其最大生物量较无鼠害样地提前一月来临，即8月底达到生长季最大值；年均生物量近似零密度样地最大，中等密度样地最小，7月底生物量可以作为年度产草量平均水平的重要依据。生长季内地下生物量于8月底均降到最低值，中等密度样地最小，近似零密度样地最大。总生物量主要由地下根系所支配，生长季内各样地基本与地下生物量保持相似的趋势，中等密度样地总生物量最小。总之，地上生物量对鼠洞密度和月份的敏感程度要强于地下生物量，鼠类活动对植物地下生物量的形成和数量在短期内没有很大的影响。
- Abstract:
- Fourty plateau pikas (Ochotona curzoniae) activities plots and four typical plots were investigated to find out the relationship between pikas effective burrows densities and plant biomass seasonal distribution of alpine meadow population. The results showed that the different burrows densities and every biomass indexes were satisfied with quadratic equation. To aboveground biomass index, burrows in MDP with 512 holes/hm2, the biomass declined to the minimum. Overall the aboveground biomass changed to single-peak curve with seasonal variation. The maximum biomass with different extent of pikas activities appeared in August which was ahead of AZDP reaching this spot in September. Biomass in July was nearly closed to the annual average, so it could be used as the important basis for evaluating whole annual hay reserves. To belowground biomass, the minimum appeared at the end of August. Of four plots MDP was the least and the AZDP was the most. Total biomass was dominated mainly by belowground root composition and showed the same trend. In summary, aboveground biomass was more sensitive to piksa activities and growing season than belowground roots. Plateau pikas activities had no significant effects on the belowground biomass formation and the quantity in the short term.
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备注/Memo
收稿日期:2009-10-23。
基金项目:国家自然基金重点项目（30730069）；四川省科技厅项目（07JY029-024）；四川农业大学“双支计划”博士专项（01570404）
作者简介:孙飞达（1978- ），男，甘肃靖远人，博士，讲师，主要从事草地生态学研究。E-mail：sunfd08@163. com