沙地樟子松天然林种子库特征研究  

Characteristics of Seed Bank for Pinus sylvestris var. mongolica Natural Forest in Sandy Land

作　　者：闫德仁[1] 王玉华 杜敏 张宝珠 

机构地区：[1]内蒙古自治区林业科学研究院,内蒙古呼和浩特010010 [2]呼伦贝尔市林业研究所,内蒙古海拉尔021008 [3]鄂温克旗林业局,内蒙古巴彦套海021100

出　　处：《内蒙古林业科技》2010年第2期12-15,共4页Journal of Inner Mongolia Forestry Science and Technology

基　　金：国家"十一五"科技支撑项目(编号:2006BAD26B0402);内蒙古科技厅项目(编号:20060305)资助

摘　　要：本文研究结果表明,樟子松天然林土壤种子库种子数量随着距树干距离（2-6 m）的增加有增加的趋势,但距树干8 m以后则降低,在距树干2-10 m范围内东侧、东南存在种子的概率占80%,西侧和北侧范围存在种子的概率为60%;樟子松天然落种数量更偏向于南侧,东侧和北侧落种数量偏少,并在树冠外围8-20m收集到的自然落种数量相对稳定;樟子松自然落种方位不同,种子发芽率也不同。距离树干4 m范围,种子发芽率平均值为71.5%;距离树干8-20 m,收集的种子发芽率依次为44.1%、70.8%、46.9%和36.1%;樟子松天然林土壤种子库内种子发芽率为58.2%,比当年自然落种平均发芽率降低17.6%。The seed amount in soil seed bank of Pinus sylvestris var.mongolica natural forest have an increasing tendency with the increase of distance from the trunks（2～6 m）,but it decreases with the distance over 8 m.In the range of 2～10 m from the trunks,the propability of seeds takes up 80 percent in the east and southeast,the one takes up 60 percent in the west and north.The amount of natural falling seeds of Pinus sylvestris var.mongolica concentrates in the south with little amount in the east and north,and the amount of natural falling seeds is relatively stable which has been collected at the range of 8～10 m surrounding the canopy.The seed germination is different with the different natural falling directions of Pinus sylvestris var.mongolica seeds.At the range of 4 m from the trunks,the average seed germination is 71.5 percent.At the range of 8～20 m from the trunks,the seed germination of collected seeds are 44.1 percent,70.8 percent,46.9 percent and 36.1 percent separately.The seed germination in the soil seed bank of Pinus sylvestris var.mongolica natural forest is 58.2 percent,with 17.6 percent lower than the average seed germination of natural falling in current year.

关 键 词：呼伦贝尔沙地 樟子松天然林 种子库 自然落种 

分 类 号：S791.253[农业科学—林木遗传育种]