哈巴湖自然保护区草地植被数量波动探讨

植被波动是植被动态的一种表现形式,该文在生态学、统计学基础上,结合草地植被特征,采用专家权重法构建草地植被波动测度公式,以哈巴湖自然保护区为例,研究2006—2010年草地植被数量波动及波动率,从数量特征上对草地植被波动进行探讨。结果表明:哈巴湖自然保护区植被波动率正向波动2007年最大,为0.381,是近年来植被生长状况最好的一年;负向波动以2009年的-0.350的绝对值最大,表明2009年是近年来植被生长状况最差的一年。草地植被数量的波动,一定程度上反映了该年度植被生长状况,为草地经营管理和植被恢复提供了便利,同时也为预测未来草地植被变化提供了依据。

Study on Fluctuation Ratio of Grassland Vegetation in the Haba Lake Natural Reserve of Ningxia Hui Autonomous Region

Vegetation fluctuation is an important part of vegetation dynamics.Based on the meanings of ecology and statistics,and combined with the characteristics of grassland vegetation,fluctuation measure formula was built by the method of expert weighting.The grassland vegetation quantitative fluctuation and its fluctuation ratio between 2006 and 2010 were studied in Haba Lake Natural Reserve of Ningxia Hui Autonomous Region,the fluctuation was discussed from the number of features on the grassland.Results showed that the biggest positive fluctuation ratio was 0.381 in 2007,meaning the best vegetation growth during recent years.While the most negative fluctuation ratio was-0.350 in 2009,meaning the worst vegetation growth during this period.Vegetation fluctuation of grassland reflects the situation of vegetation growth and provides scientific basis for grassland management,as an effective method to forecast future grassland fluctuations.