气象因子对高原鼢鼠种群数量的影响

Effect of meteorological factors on the population of plateau zokor

高原鼢鼠是青藏高原地区主要的啮齿动物种类之一,了解其种群数量与气象因子的关系对高原鼢鼠种群消长规律及生物多样性的维持具有重要意义。2013-2016年对高原鼢鼠种群密度进行了研究,利用Pearson相关分析以及典范对应分析对高原鼢鼠种群密度以及扰动区草地生物量与7个气象因子的相关性进行了分析。结果表明,高原鼢鼠种群密度及草地生物量总体呈下降趋势,且高原鼢鼠种群密度与双子叶植物生物量呈显著正相关(P<0.05)。温度和降水量对高原鼢鼠种群数量以及生物量有较大影响,其中年平均气温和年平均最低气温与高原鼢鼠种群密度显著相关(P<0.05),另外,高原鼢鼠种群密度与日照时数关系密切。气象因子主要通过对高原鼢鼠食物的影响而对其产生间接影响。

The plateau zokor(Myospalax baileyi)is one of the main rodent species in the Qinghai-Tibet Plateau.Understanding the impact of meteorological factors on the growth and decline of the plateau zokor population is of high relevance to managing the maintenance of biodiversity.The population density of the plateau zokor was studied from 2013 to 2016.Pearson correlation analysis and canonical correspondence analysis(CCA)were used to study the population density of the plateau zokor and the correlation between the grassland biomass and seven meteorological factors in the disturbance zone.It was found that the population density and grassland biomass of the plateau zokor showed a downward trend over the study period,and the density of plateau zokor was significantly positively correlated with the biomass of dicotyledons(P<0.05).The temperature and precipitation strongly influenced the population and biomass of the plateau zokor.The annual mean temperature and the annual mean minimum temperature were significantly correlated with the population density of the plateau zokor(P<0.05).In addition,the population density of the plateau zokor and sunshine hours are closely related.Meteorological factors have an indirect effect on the food supply of plateau zokor.