[1]李阳兵,谢德体,魏朝富.三峡库区典型岩溶山地土壤种子库研究——以重庆市为例[J].重庆师范大学学报(自然科学版),2009,26(02):44-48.[doi:10.11721/cqnuj20090209]
LI Yang-bing,XIE De-ti,WEI Chao-fu.Studies of Soil Seed Banks of Representative Karst Mountainous Region in Three Gorges reservoir region——Based on Chongqing Municipality[J].期刊社,2009,26(02):44-48.[doi:10.11721/cqnuj20090209]
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LI Yang-bing,XIE De-ti,WEI Chao-fu.Studies of Soil Seed Banks of Representative Karst Mountainous Region in Three Gorges reservoir region——Based on Chongqing Municipality[J].期刊社,2009,26(02):44-48.[doi:10.11721/cqnuj20090209]
三峡库区典型岩溶山地土壤种子库研究——以重庆市为例
重庆师范大学学报（自然科学版）[ISSN:1672-6693/CN:50-1165/N]
卷:
26
期数:
2009年02期
页码:
44-48
栏目:
三峡地区资源环境与生态研究
出版日期:
2009-04-25
- Title:
- Studies of Soil Seed Banks of Representative Karst Mountainous Region in Three Gorges reservoir region——Based on Chongqing Municipality
- Keywords:
- Three Gorges reservoir region; Chongqing municipality; karst mountainous region; soil seed bank; land use; vegetation recovery
- 文献标志码:
- A
- 摘要:
- 用“以空间代替时间”的方法，选取重庆市北碚、巫山、黔江、南川金佛山等4个典型地点，从种类组成、种子数量、物种多样性、种子分布规律和物种相似性方面比较了三峡库区典型岩溶山地处于不同生态演替序列的自然(原始)林地、次生林地、灌草坡、耕地、人工林、弃耕撂荒地等土地利用系统的土壤种子库特点。上述典型地点的研究表明：研究区24个不同的样地土壤种子库共萌发植物68种，土壤种子库组成总体上以草本植物为主且与地上植被关系较密切，并仍处于植被演替的早期阶段，退化较严重；随土地利用强度增加，土壤中草本种子所占的比例也越大，在弃耕地→灌草坡→次生林地序列上，生态优势度呈降低趋势，而物种丰富度和多样性增加；石灰岩草坡开垦成耕地后，其中本来较小的种子库很快受到破坏。因此，土地利用方式的变化是对三峡库区石灰岩次生植被及其种子库的主要威胁。
- Abstract:
- Using the method of “Replacing time by space”, based on the analysis of species composition, amount and distribution, ecological dominance and species similarity, and its diversity, the properties of soil seed banks of different land use system which located different ecological evolving sequence including natural forest, secondary forest, shrub grassland, cropland, artificial woodland, abandoned dry field were studied in Beibei, Wushan, Qianjiang and Jinfo Mountain of Nanchuan which belong to Chongqing municipality, a representative karst mountainous region of Three Gorges Reservoir region. The results showed that 68 species germinated in all of 24 plots, most seeds in different land use system soil seed banks are herbage species, and had a obvious connection with above vegetations, indicating that vegetations are at the early stages of succession, degraded seriously. The amount of seeds of xylophyta species decreased and that of herbaceous species which dominated by farmland weeds increased with the increasing of land use intensity. The geographical compositions of herbaceous plants of shrub-grass plot’s soil seed bank indicate that genera of cosmopolitan had a heavy percentage, indicate that the growth of herbaceous layer is affected significantly by human being’s activities. Therefore, it is important to preserve rare tree species in existing karst vegetation for improving the karst shrub grass land’s evolution successively. From abandoned cropland, shrub-grass land to secondary forest land, the ecological dominance declined, the diversity and richness indices increased. After the karst slope being cultivated, the soil seed banks of it were destroyed soon. Therefore, the changes of land use pattern are the main threat to the karst secondary vegetation and its soil seed banks in Three Gorges reservoir region.
更新日期/Last Update:
2009-06-03