摘要
应用数量分类学的理论和方法,选取松辽生态区扁杆藨草(Scirpus planiculmis Fr.Schmidt)无性繁殖中相对稳定的8个救量性状进行最大同步分支分类。通过建立无性繁殖势树系图和自然繁衍代生长发育水平图,揭示了扁杆藨草自然繁衍代个体发育与种群竞争势的相关性。根据扁秆藨草无性繁殖高峰期跃迁值的数量指标,确定灭草的关键期。
With theoretical and method ecological approach of numerical taxonomy,by selecting 8 rela- tively stable numerical characters in asexual propagation of Scirpus planiculmis in Songliao ecolog- ical area we have carried out the maximum synchronous branch classification for the investigation of the regularity in asexual propagation. A dendrogram of asexual propagation potency was estab- lished with maximum synchronous branch coefficients as numerical parameters and a developing level graph of asexual propagation characters in the matural propagation generations was drawn up on the basis of the total value of evolutionary steps. Thus the relativity between the ontogenesis of natural reproduction and the community competitive potency was unveiled. Based on the nu- merical parameters of leaped values in the asexual propagation of S. planiculmis,the key period of weed eradication was determined.
基金
国家"七.五"科技攻关课题
关键词
扁杆Biao草
营养繁殖
种间竞争
Scirpus planiculmis
Maximum synchronous branch classification
Asexual propagation potency
Community competitive potency
Evolutionary step
Dendrogram
Developing level graph
