摘要
为了解衡阳紫色土丘陵坡地不同土地利用模式下土壤种子库特征,利用土壤种子库＂萌发法＂,对衡阳紫色土丘陵坡地种子库在封山育林（20a）模式（Ⅰ）、退耕还林（2a）模式（Ⅱ）、农耕模式（Ⅲ）的土壤种子库进行分析。结果表明：（1）3种土地利用模式种子库平均密度的大小顺序为：模式Ⅱ〉模式Ⅲ〉模式Ⅰ。（2）土壤种子集中分布于0－5cm土层,随土层深度增加,种子数量与种类趋于减少。（3）3种土地利用模式种子库物种Czekanowski相似性系数（CC）较低,Patrick丰富度指数（R）的大小顺序为：模式Ⅱ〉模式Ⅰ〉模式Ⅲ（P〉0.05）;Shannon-Wiener指数（H）和Pielou均匀度指数（E）的大小顺序均为：模式Ⅱ〉模式Ⅲ〉模式Ⅰ（P〈0.05）;Simpson指数（D）的大小顺序为：模式Ⅰ〉模式Ⅲ〉模式Ⅱ（P〈0.05）。（4）土壤种子库所含物种数较接近,物种组成以草本植物为主,菊科、禾本科占优势。（5）封山育林模式和退耕还林模式属于进展演替,封山育林模式处于较高演替阶段,农耕模式属于逆行演替。研究表明：衡阳紫色土丘陵坡地具有依靠土壤种子库实现自然恢复的潜力,但单依靠土壤种子库自然恢复到现存植被是困难的,需要在自然恢复潜力评估的基础上积极充分采取人工促进自然恢复的策略,促进当地的植被恢复。
The sloping-land with purple soils in Hengyang of Hunan Province,South-central China covers1.625×10^5 hm2.It is the most severe region of eco-environment,and at the same time,the most representative eco-catastropie region in South China.Therefore,ecosystem restoration of the present problem area has been focused.Since,re-vegetation is the first of any restoration program conducted,by which,land cover will be safe for further wastage.Thus,to comprehend the soil seed bank properties under different soil-usedmodels,we investigated the soil seed bank in hill closing（20a）（Ⅰ）,abandoned farmland（2a）（Ⅱ）and farmland（Ⅲ）,using the＂seed germination＂method.The objectives of the present study were：How landused influences the species composition in the ecosystem？What relationship exists between soil seed banks and re-vegetation？Results indicated：（1）The average seed density among three different land-used models were followed the order as modelⅡ〉modelⅢ〉modelⅠ.（2）The effect of soil depth on seed number was significantly different as the highest seed number was found in 0－5cm soil layer and showed decreasing trend with the increase of soil depth.（3）The Czekanowski similarity indices of three different land-used models seed banks were low（0－0.399 8）.Patrick richness（R）among three different land-used models were followed the order as modelⅡ（16）modelⅠ（14）modelⅢ（13）（P〉0.05）,the Shannon-Wiener indices（H）and Pielou evenness indices（E）,modelⅡ〉modelⅢ〉modelⅠ（P〈0.05）,the Simpson indices（D）,modelⅠ〉modelⅢ〉modelⅡ（P0.05）.（4）Most abundant herbaceous species composition was the member of Compositae and Gramineae family indicated the re-vegetation laid early stage of primary succession.（5）ModelⅠ and modelⅡ belonged to progressive succession（modelⅠ stayed higher succession stages）,and modelⅢ,retrogressive succession.All the results indicated it was possible but difficult for ecosystem restora
出处
《西北植物学报》
CAS
CSCD
北大核心
2014年第11期2324-2330,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
湖南省科技厅项目(S2006N332)
湖南省教育厅科学研究项目(12C1057)
湖南省林业科技创新计划(XLK201341)
湖南省衡阳市科技计划(2014KN27)
湖南省普通高校青年骨干教师培养对象资助项目
湖南环境生物职业技术学院南岳学者基金(湘环职院[2012]4号)
关键词
不同土地利用模式
土壤种子库
物种组成
植被恢复
紫色土
衡阳
different land-used models
soil seed bank
species composition
re-vegetation
purple soils
Hengyang
