Effects of stand and landscape level factors on the occurrence of pine wilt disease-a case study of pine forest in Weihai,Shandong Province
Since pine wilt disease was introduced into China,it has caused a large area of pine forests to wither and die,which seriously threatens the safety and development of China's forestry resources.However,there are few studies on the comprehensive effects of stand and landscape level factors on pine wilt disease.In this paper,based on the pine forest in Weihai area of Shandong Province in the late stage of Pine wilt disease,various factors affecting the damage of pine wilt disease at the stand level and landscape level were obtained by using field survey data,second-class survey data of forest resources and high-resolution remote sensing images,through stepwise regression analysis,linear regression analysis and generalized linear model(GLM),the optimal scale of landscape analysis was discussed,the roles and relative importance of different factors in explaining the damage degree of pine wilt disease were analyzed,in order to provide scientific basis for the prevention and control technology of pine wilt disease and the formulation of macro-management policies.The results showed that the landscape pattern index at 750 m scale had the best interpretation effect on the incidence of pine wilt disease.Among the landscape factors,the distance from the epidemic focus,landscape separation and distance from the human activity area had the most significant effects on morbidity(relative importance value was 1.00).Landscape separation and distance from the epidemic focus were negatively correlated with the incidence,while distance from the human activity area was positively correlated with the incidence;The relative importance of patch connectivity in pine forest was second(the relative importance value was 0.69),which was positively correlated with the incidence;The relative importance values of patch richness density and related peripheral circle index were lower(0.33).Among the stand factors,the relative importance value of stand density was the lowest(0.23).A comprehensive analysis of the effects of forest and landscape factors showed that,compared with stand factors,landscape factors played a leading role in the later stage of pine wilt disease outbreak in Weihai area.The results contribute to the understanding of the driving mechanism of Pine wilt disease.
Pine wilt diseasestand factorlandscape factoroptimal scalegeneralized linear model
NETL
NSTL
万方数据
