关键词: 生命周期, 乡村景观格局, 演变周期, 预测方法, CA-Markov

Abstract: Base on the field survey data, the static life tables of Pteroceltis tartarinowii populations in different habitats of Huangchanyu Nature Reserve were established, and the populations’ quantitative characteristics were evaluated by analyzing the curves of survival rate, mortality rate, and vanishing rate as well as four survival function curves. The dynamics of the populations were also analyzed by the quantitative analysis of population structure and the time sequence model. In different habitats of the Reserve, the DBH structure of P. tartarinowii populations was overall presented as pyramid type, with relatively large amount of young- and middle-aged but less amount of old individuals. The populations had definite fluctuations in their growth dynamics, but the dynamic indices Vpi and Vpi′ (considering the external interferences) were both greater than zero. A stable-growth type population was thus shown in different habitats. The P. tartarinowii populations in different habitats had a higher mortality at young stage, but the mortality decreased gradually with increasing tree age. When entering into physiologically consenescence period, the populations’ mortality re-ascended on sunny and shady slope, but decreased slightly in valley due to the individuals better protected. The survival curves of the populations differed with habitats, inclined to be Deevey-Ⅱ type on sunny and shady slope and Deevey-Ⅲ type in valley. The four survival function curves indicated that the populations on sunny and shady slope was decreased rapidly at young, stable at mature, and declined at old stage, whereas the populations in valley was decreased quickly at young, and stable at mature and old stages. Time sequence model suggested that in the next 2 and 5 years, the P. tartarinowii populations in different habitats of Huangchanyu Nature Reserve would present a stable-growth trend.

Key words: life cycle, rural landscape pattern, evolution cycle, prediction method, CA-Markov.