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应用自然萌发法和物理筛选法相结合的方法 ,调查了地中海沿岸沙丘三种微生境土壤总种子库和永久种子库特征 ,用功能群的方法分析了微生境之间的土壤总种子库和永久土壤种子库的组成和结构差异 ,也分析了主要物种土壤种子库的微生境分布格局 ,分析了种子大小和土壤种子库中的种子永久性关系。发现地中海沿岸沙丘土壤种子库具有明显的空间异质性 ,即使在相同的微生境内 ,土壤种子库的分布也不是均匀的 ,甚至具有很大的差异 ;微生境对总的土壤种子库和各功能群的土壤种子库的分布格局具有显著的影响 ,开阔地区域具有最大的种子密度 ,而灌丛下和路径具有较小的种子密度 ;在永久土壤种子库中 ,豆科类植物种子在休眠种子中占有最大的比例 ,约为 76 % ,而一年生和多年生禾草未发现休眠种子 ,豆类、伞形科类、多年生阔草、菊科类、一年生阔叶草和十字花科类等种子在土壤中的永久性比例依次下降 ,分别为 5 0 %、4 6 %、4 1%、6 %、6 %和 1% ,微生境影响各功能群种子在土壤中的永久性。微生境显著影响大部分主要物种的土壤种子库分布 ;种子大小与其在土壤中的永久性为正相关 ,即大种子具有较高的永久性 ,小种子具有较低的永久性
Using the combination of natural germination method and physical screening method, the characteristics of total seed bank and permanent seed bank in three kinds of micro-habitats of Mediterranean sand dunes were investigated. Functional groups were used to analyze total soil seed bank and permanent soil The composition and structure of the seed bank were also analyzed. The distribution pattern of the soil seed bank in the main species was also analyzed. The relationship between the seed size and the seed permanent in the soil seed bank was analyzed. It was found that the soil seed bank of dunes in the Mediterranean coast had obvious spatial heterogeneity. Even in the same microbial habitat, the distribution of soil seed bank was not uniform or even very different. Function groups had a significant effect on the distribution pattern of soil seed bank, with the largest seed density in open areas and smaller seed density under shrubs and pathways; in the permanent soil seed bank, leguminous seeds in dormant seeds Occupying the largest proportion of about 76%, while the annual perennial and perennial grasses found no dormant seeds, beans, Umbelliferae, perennial broadleaf, Compositae, annual broadleaf and cruciferous seeds in the The permanent proportions of soil in the soil decreased by 50%, 46%, 41%, 6%, 6% and 1%, respectively. Microbial habitat affected the permanence of each functional group seed in the soil. Micro-habitats significantly affected the distribution of soil seed banks in most major species; the seed size was positively correlated with its permanence in soil, ie, large seeds were highly permanent and small seeds had lower permanence