子午岭人工油松林土壤种子库特征研究

Characteristics of Soil Seed Bank of Pinus Tabulaeformis Plantation in Ziwuling Mountains

采用野外调查取样和室内观测试验相结合的方法,研究了子午岭人工油松林土壤种子库的物种组成、密度、垂直分布等特征。结果表明:(1)土壤种子库储量密度平均为5711粒/m2,最大密度是9537粒/m2,最小密度是3563粒/m2。(2)土壤种子库的种子的垂直分布主要集中在0—2.5cm,2.5—5cm和5—7.5cm这3个层次,占75.38%～79.32%,枯枝落叶层和7.5—10cm层分布较少,占20.68%～24.62%。(3)土壤种子库物种组成主要为灌木和草本两个种类,无乔木植物,多年生草本在物种数和种子数上占据明显优势。

Field survey and laboratory observation experiment were conducted to study the character of soil seed bank for Pinus Tabulaeforrnis Plantation in Ziwuling Mountains, such as species composition, density, and the vertical distribution of species. Results indicated that （1） the average seed storage of seed banks was 5 711 grains/m2 and the minimum and the maximum storage were 3 563 grains/m2 and 9 537 grains/m2 , re- spectively. （2） Vertical distribution of the soil seed bank mainly concentrated in the three levels of 0--2.5, 2.5--5, and 5--7.5 cm, accounting for 75.38%-79.32%, and for the forest flooring and the 7.5-10 cm level, the distribution accounted for 20.68%--24.62%. （3） Species composition of the soil seed bank for the two types of shrubs and herbaceous, non-tree plant, the perennial herb occupies the obvious superiority in the species number and the seed number.