首页> 中文期刊> 《土壤学报》 >重庆南平喀斯特石漠化区不同土地利用方式下的表土孢粉组合特征

重庆南平喀斯特石漠化区不同土地利用方式下的表土孢粉组合特征

         

摘要

Palynological analysis of 33 samples of topsoils and mosses collected from fields under five different types of land use in the karst area of rocky desertification in Nanping Town, Chongqing, shows that (1) the spores and pollens found in the samples could be sorted into SO genera dominated by those of herbage and ferns, which accounted for 38. 84%~86. 56% of the total (except for samples from Secondary Masson Pine forest, Secondary Cryptomeria forest and Peach orchard) , and was followed by those of arbor (mainly Pinus massoniana) accounting for 13. 42%~59. 40% , and by those of shrubs, accounting for only about 0. 00%~ 12. 50% , which is a significant indicator of serious degradation of the local vegetation; (2) Abundance of pollen types did not differ much from field to field under different land uses, and changes in species diversity took place mainly in arbors and shrubs, and little in herbage and ferns; (3) Pollen assemblage varied sharply from field to field under different land uses, which reflects basically the situation of the current vegetation of the area; (4) With increasing land use intensity, pollens of arbors and shrubs were decreasing in content and type, while those of herbs and ferns increasing, and dominated by pollens of farmland weeds. It is, therefore, concluded that the changes in land use are the main factor affecting the secondary vegetation and the pollen assemblages in the karst rocky desertification area.%重庆南平喀斯特石漠化地区5种不同土地利用方式下的33个表土和苔藓样品的孢粉分析表明:(1)研究区植物孢粉共由50科属组成,以草本和蕨类植物占据优势(除次生马尾松林、次生柳杉林和桃树林外),含量为38.84%~86.56%,其次是乔木(主要为马尾松),含量为13.42%~59.40%,灌木植物花粉含量最低,为0.00%~12.50%,显示该区植被退化严重;(2)不同土地利用方式的花粉类型丰富度差别不明显,物种多样性主要表现为乔木和灌木植物种类的变化,草本和蕨类基本保持不变;(3)不同土地利用方式的表土孢粉组合差别明显,与其相应的实际植被情况大致相同,基本反映了石漠化地区现代植被的基本状况;(4)随着土地利用强度的增加,表土孢粉组合中乔灌木花粉含量和种类越少,草本和蕨类植物孢粉含量越多,且以耕地杂草为主.因此,土地利用方式的变化是对喀斯特石漠化区次生植被及其表土孢粉组合的主要影响因素.

著录项

  • 来源
    《土壤学报》 |2011年第6期|1265-1273|共9页
  • 作者单位

    西南大学地理科学学院,三峡库区生态环境教育部重点实验室,重庆400715;

    同济大学海洋与地球科学学院,上海200092;

    西南大学地理科学学院,三峡库区生态环境教育部重点实验室,重庆400715;

    同济大学海洋与地球科学学院,上海200092;

    西南大学地理科学学院,三峡库区生态环境教育部重点实验室,重庆400715;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 孢粉学;
  • 关键词

    表土孢粉组合; 石漠化; 土地利用方式; 重庆南平;

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