不同生态恢复阶段种内竞争影响下的种群死亡率研究

Intraspecific competition, as a long-standing and constantly adjusted ecological relationship, is an important factor affecting the mortality of population. In order to clarify the effect of intraspecific competition on population mortality in ecological restoration, three permanent plots were set up in Changting County, Fujian Province, and the survival status of pioneer species of Pinus massoniana was investigated. The intensity of intraspecific competition was quantified by using Hegyi competition index. The results showed that (1) in the later period of pioneer stage, the individual size distribPopulation mortality under the influence of intraspecific competition in different ecological restoration stagesution of P. massoniana was scattered, and the intensity of intraspecific competition was the most intense. In the middle and early periods of pioneer stage, the individual size variability level of P. massoniana was low, and the intraspecific competition intensity in the early stage was higher than that in the middle stage. (2)With the increase of intraspecific competition intensity, the risk of seedling death increased. Intraspecific competition significantly affected the mortality of the population in the early and middle stages of ecological restoration pioneer stage, while intraspecific competition was not the main factor affecting the mortality of the population in the late stage of ecological restoration pioneer stage. The results show that the effects of intraspecific competition on the population are different in stages, and individuals of different sizes in the population have different responses to intraspecific competition.