青藏高原多年冻土区高寒草甸植物种群物候学定量研究

采用青藏高原腹地北麓河多年冻土区高寒草甸14种代表性植物种群2009年和2010年两个生长季的物候观测资料, 进行植物种群物候学特征的定量分析, 划分物候类型并指出影响不同物候期的环境因子主次. 结果表明: 营养期和结实期的物候指数都较大, 分别为32.70和24.39, 其他物候期则相对较小; 整个生长期持续天数较短, 为155 d左右. 14种植物可划分为3种类型和6大类群. 在营养期和整个生长期, 与物候变化最为密切的环境因子为降水量, 其次为日照时数, 温度居第三; 而影响其他物候期的因子均以日照时数为主, 降水量和温度依次居后.

A Quantitative Study on the Plant Population Phenology of Alpine Meadow in the Permafrost Regions of Qinghai-Tibetan Plateau

Based on the datasets of phenological observation in two growing seasons of 2009 and 2010 for 14 representative plant populations of alpine meadow in the Beiluhe permafrost regions of the hinterland of Qinghai-Tibetan Plateau, a quantitative analysis of phenological characteristics was carried out, and phenological types and main environmental factors that influenced different phenological periods were divided. The results showed that 1) phenological indices of vegetative period and productive period were 32.70 and 24.39, respectively, which were larger than those of other phenological periods. Lasting days of the entire growing period were relatively short (about 155 d). 2) The 14 plant species were divided into three types and six groups. 3) During vegetative period and growing period, precipitation was the most related environmental factor to phenological change, sunshine duration was the second and temperature was the third. However, the main environmental factors that influenced other phenological periods were listed as below: sunshine duration, precipitation and temperature, respectively.