摘要
Six plots were investigated and field data were obtained with the contiguous grid quadrate method in a natural Populus euphratica forest in the upper reaches of the Tarim river.We developed a static life table and a survival function of Populus pruinosa population based on the population life table and a theory of survival analysis.Survivorship curves,and the mortality rate were determined,and population dynamics were analyzed by using the spectral analysis.The results showed that:1)Survival numbers of P.pruinosa populations were decreased with the increasing of age,and the expecting life of individuals with DBH larger than 40 cm declined obviously.2)The Survivorship curve of the populations was Deevey Ⅲ.Four survival functions showed that the P.pruinosa population declined in young age and stabilized in old age.3)There were two peaks of mortality rate existed in the lifespan:respectively occarred at the first and 11th age class periods.Seedling shortage was the restricting factor of development.4) The spectral analysis of the populations showed that there was a marked periodic fluctuation in the process of natural regeneration.5)The higher mortality rate of P.pruinosa seedlings might be integrated by the interplay of biological characteristics of P.pruinosa and deteriorating habitat(groundwater level decreasing).
Six plots were investigated and field data were obtained with the contiguous grid quadrate method in a natural Populus euphratica forest in the upper reaches of the Tarim river. We developed a static life table and a survival function of Populus pruinosa population based on the population life table and a theory of survival analysis. Survivorship curves,and the mortality rate were determined, and population dynamics were analyzed by using the spectral analysis. The results showed that ： 1 ） Survival numbers of P. pruinosa populations were decreased with the increasing of age, and the expecting life of individuals with DBH larger than 40 cm declined obviously. 2） The Survivorship curve of the populations was Deevey m. Four survival functions showed that the P. pruinosa population declined in young age and stabilized in old age. 3）There were two peaks of mortality rate existed in the lifespan： respectively oecarred at the first and llth age class periods. Seedling shortage was the restricting factor of development. 4） The spectral analysis of the populations showed that there was a marked periodic fluctuation in the process of natural regeneration. 5） The higher mortality rate of P. pruinosa seedlings might be integrated by the interplay of biological characteristics of P. pruinosa and deteriorating habitat （groundwater level decreasing）.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2010年第1期131-135,共5页
Scientia Silvae Sinicae
基金
973计划前期研究专项(2008CB417216)
中国科学院"西部之光"项目(RCPY200807)
关键词
塔里木河
灰胡杨
种群统计
生存函数
谱分析
Tarim River
Populus pruinosa
population demography
survival function
spectral analysis
