浙江天童常绿阔叶林米槠种子雨和地表种子库动态研究  

Study on Dynamic of Seed Rain and Seed Bank of Castanopsis carlesii Population in Tiantong Mountain,Zhejiang Province

作　　者：王良衍 杨海波[2] 王建军 曹立光 

机构地区：[1]浙江天童国家森林公园,浙江宁波315114 [2]华东师范大学浙江天童森林生态系统国家野外科学观测研究站,上海200062 [3]宁波市林业局特种苗繁育中心,浙江宁波315040 [4]宁波市鄞州区林业技术管理服务站,宁波鄞州315100

出　　处：《福建林业科技》2012年第3期4-7,共4页Journal of Fujian Forestry Science and Technology

基　　金：宁波市科技局重大项目(2005B110005);宁波市科技项目(2010C10028);宁波市发改委"宁波市珍贵用材树种种质资源库扩建项目"

摘　　要：2008年在浙江天童山常绿阔叶林的林缘和林内2个米槠种群中各选择3株米槠(Castanopsis carlesii),采用种子筐及地表取样等方法,分析了米槠种子雨和地表种子库动态特征、种子存留及其命运。结果表明:米槠种子雨主要出现在10月中旬—11月,持续约50 d,11月3日—17日为高峰期;该地区米槠的种子产量较高,林缘种群高于林内种群,单株平均落果数分别为201.0、120.3个.m-2;种子雨中完好的坚果占52.2%,虫蛀的占29.3%,松鼠啃食的占10.2%,败育的占8.4%,腐烂的占5%;完好种子的长度、宽度分别为(9.01±0.89)mm、(9.25±1.00)mm,粒重为(0.47±0.13)g;在地表种子库中,林缘种群、林内种群完好种子的存留密度分别为1.5、1.0个.m-2,分别占种子库的62.1%、66.4%,动物捕食是种子受损的主要原因。米槠种群较高的种子产量、较低的地表种子存留率等环节限制了米槠种群的天然更新。In the study,there were 3 individuals of Castanopsis carlesii chosen and tagged,respectively at the edge and the center of evergreen broad-leaved forest in Tiantong National Forest Park,Zhejiang Province.Seed traps were set up to analyze dynamic of seed rain and seed bank of C.carlesii population in 2008.The results showed that:seed rain of C.carlesii occured from October 11 to November 30,lasting for 50 d and the amount of the seed rain reached the peak from end of October to mid-November,had the relative high yield;C.carlesii at the edge yield had higher seed productivity than in the center,and there were 201.0 and 120.3 seeds·m-2 gathered,respectively at the edge and in the center of the forest.The amount of the intact seeds accounted for 52.2% of total seeds,moth-eaten seeds accounted for 29.3%,seeds eaten by squirrels accounted for 10.2%,abortive seeds accounted for 8.4%,5% were decayed.The length and width of the intact seeds were 9.01±0.89 mm and 9.25±1.00 mm,respectively.And the grain weight of the intact seeds were of 0.47±0.13 g.At the surface seed bank,the density of intact seeds were 1.5 and 1.0 m-2,respectively at the edge and in the center.Animals predation was the main reason for the two groups,accounted for 62.1% and 66.4% of total loss amount;Although the two populations of C.carlesii had high seed yields,but low remaining rates of the seeds at the surface limited the regeneration of C.carlesii population.

关 键 词：米槠 种子雨 土壤种子库 天童山 

分 类 号：S792.17[农业科学—林木遗传育种]