以西南桦人工林与天然林的土壤种子库为研究对象,采用室内萌发法对云南热区的西南桦人工林与天然林下0 ～10 cm深度的土壤种子库的种子储量及其垂直分布进行了研究.研究结果表明:①西南桦人工林有活力种子储量为2 027粒/m2,天然林有活力种子储量为3 043粒/m2；②西南桦人工林土壤种子库由21科38属的42种植物组成,其中乔木4种,占全部种类的0.69％；灌木16种,占7.70％；多年生草本10种,占14.90％；1 a生草本9种,占73.36％；藤本3种,占3.35％.西南桦天然林土壤种子库由24科43属的49种植物组成,其中乔木6种,占全部种类的10.56％；灌木15种,占18.31％；多年生草本14种,占4.38％；1 a生草本10种,占65.06％；藤本4种,占1.69％；③乔木、灌木的植物数量占总数的比例为天然林＞人工林,而草本和藤本为天然林＜人工林；④西南桦人工林与天然林土壤种子库有活力种子密度自上而下都呈现下降趋势,0～5 cm种子数量较5 ～ 10 cm多.%Taking soil seed bank of Betula alnoides plantation and Betula alnoides natural forest as the object, seeds storage and vertical distribution of soil seed bank under depth of 0 ~ 10cm were studied in Yunnan hot zone by using indoor germination method. The results showed that; (1)Vigor seed reserves of Betula alnoides plantation was 2027 seeds/ m2, and natural forest was 3043 seeds/ m2; (2) Soil seed bank of Betula alnoides plantation was consisted of 42 plant species belonging to 21 family and 38 genus, including 4 kinds of Arbor species, accounting for 0. 69% of all species; 16 kinds of shrubs, accounting for 7. 70% ; 10 kinds of perennial herbs, accounting for 14. 90% ; 9 kinds of annual herb, accounting for 73. 36% ; 3 kinds of Fujimoto, accounting for 3. 35% . Soil bank of Betula alnoides natural forest was consisted of 49 plant species belonging to 24 family and 43 genus, including 6 kinds of trees, accounting for 10. 56% of all species; 15 kinds of shrubs, accounting for 18. 31% ; 14 kinds of perennial herbs, accounting for 4. 38% ; 10 kinds of annual herb, accounting for 65. 06% ; 4 kinds of Fujimoto, accounting for 1. 69% ;(3) The proportion of the number of trees and shrubs to the total number was followed as natural forest > plantations, and the proportion of herbs and vine was followed as natural forest < plantations ; (4) The vigor seeds density of the soil seed bank of Betula alnoides plantation and Betula alnoides natural forest showed a downward trend from top to bottom, which the seeds number under depth of 0 ~ 5cm were more than the depth of 5 ～10 cm.
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