摘要
选用解释结构模型(ISM)分析松林生态系统对松材线虫干扰如何作出响应。结果表明:影响松林生态系统对松材线虫干扰做出响应的系统是一个5级的多级递阶系统,响应结果表现为抵御性和恢复性。群落中优势树种分布格局和松树的生物生态学特性是影响松林生态系统的抵御性的最大因素,受害木伐除和其他措施也通过影响松墨天牛的危害程度和物种分布格局而间接影响到抵御性。对于恢复性而言,除受土壤因子、水文、周围种源和次优或共优树种的生物学特性等直接影响外,气象因子也会直接或间接影响恢复性。海拔、坡度、坡向等地形因子和地理位置的差异和防治水平的提高也影响了松林生态系统对松材线虫干扰作出响应。
The pine wood nematode（PWN）,Bursaphelenchus xylophilus,originating from the North America,causes the destructive pine wilt disease.The different pine forests＇ ecosystem has different resistance to B.xylophilus,and after its invasion,the resilience and restoration direction of different ecosystem differed,too.In this paper,an interpretive structural model was applied for analyzing the response of pine forests＇ ecosystem to disturbance by PWN.The result showed that the system that affected the response of pine forests＇ ecosystem made to pine wood nematode＇s disturbance is a 5 degree multistage hierarchical one,which direct influencing factors are resistance and resilience.Furthermore,the analysis to the 2nd,3rd and 4th degree factors showed that not only distribution pattern of plant species and pine＇s ecological features affected the resistance of pine forests＇ ecosystem,the effecting factor of removing attacked trees and other treatment measures also influenced the resistance via affecting the damage degree of Monochamus alternatus and distribution pattern of plant species indirectly.As for resilience,besides it was influenced directly by edaphic factor,hydrology,surrounding species provenance and biology characteristics of the second and jointly dominant species,the weather factors also can have a direct or indirect influence by affecting the above factors on the resilience of system.Among 5th elements,the altitude,gradient and slope direction etc.topographical factors,diversity of geographical location and improvement of prevention technology level all influenced the response of pine forests＇ ecosystem made to pine wood nematode＇s disturbance.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2007年第8期85-90,共6页
Scientia Silvae Sinicae
基金
国家重点基础研究发展规划资助项目(2002CB111404)
关键词
松材线虫
干扰
解释结构模型
抵御性
恢复性
Bursaphelenchus xylophilus
disturbance
interpretive structural model
resistance
resilience
