摘要
对昆明西山地区滇青冈（Cyclobalanopsis glaucoides）和高山栲（Castanopsis delavayi）种子（坚果）虫蛀率在两个年份、整个落种期和山坡不同部位的变化情况进行研究．结果表明：①寄生于滇青冈种子内的象甲为青冈象（Curculio megadens）和Curculio sp．，寄生于高山栲种子内的象甲是Curculio sp．和剪枝象（crltorhrnchites sp．）；②滇青冈样地的虫蛀率为24．84％一27．60％，样地间无显著差异，两年间的平均虫蛀率亦无显著差异；高山栲样地间虫蛀率为17．94％-26．55％．有显著差异性，两年间的平均虫蛀率也有显著差异。③高山栲的下落种子虫蛀率随时间逐步下降，9月和10月中下旬出现两个虫蛀率的高峰期；高山栲种子内寄生的昆虫落地后即入土化蛹，滇青冈落地种子内的寄生昆虫在初期会滞留一段时间：④虫蛀率与林下实生苗数量无显著相关性，实生苗多集中在大树周围以及草本层植物较丰富的小生境。
Insect predation on oak trees played an important role in population regeneration and seed dispersal. In- sect infestation on the acorns of Cyclobalanopsis glaucoides and Castanopsis delavayi were compared between the plots at different slope position in two years at Xishan Mountain, Kunming, China. We established three plots for each tree species to observe seed rain and to collect seeds from early September to late November, covering whole seed falling season. The results showed ： 1 ） Parasitic insects in Cy. glaucoides acorns were Curculio megadens Pelsue and Zhang and Curculio sp. Within Ca. delavayi acorns, they were Curculio sp. and CyUorhynchites sp. 2 ） Infestation rates of Cy. glaucoides were not significantly changed among plots （ 24. 84% - 27.60% ） and in two years （ 25.47% in 2005, and 27. 11% in 2006）. In contrast, there were significant spatial and temporal variation for Ca. delavayi, 17.94% - 26. 55% among plots, and 26. 69% in 2005, and 16. 90% in 2006. 3） Weevil-infested acorns were heterogeneous in failing time. Infestation rate reduced gradually among the falling acorns, and there were two peaks of weevil-infested acorns, middle to late September and middle to late October. Retention time of larvae inside the fallen acorns of Cy. glaucoides was longer than in Ca. delavayi＇ s. 4） Seedling recruitment may be related to insect predation. However, the weevil infestation rate was not significant related to the seedlings density among plots. There were more seedlings around big trees and at sites with higher herb coverage.
出处
《植物分类与资源学报》
CAS
CSCD
北大核心
2014年第5期629-638,共10页
Plant Diversity
基金
国家自然科学基金项目(30960061和31160080)
关键词
滇青冈
高山栲
象甲
虫蛀率
幼苗补充
Cyclobalanopsis glaucoides
Castanopsis delavayi
Weevil
Infestation rate
Seedling recruitment
