文献类型：期刊文献

中文题名：黔中石漠化地区不同土地利用类型土壤种子库特征

英文题名：Different land-used soil seed banks in Karst Rocky Desertification area of middle Guizhou Province,China

作者：李生[1] 姚小华[1] 任华东[1] 张守攻[2]

第一作者：李生

机构：[1]中国林业科学研究院亚热带林业研究所,富阳311400;[2]中国林业科学研究院,北京100091

年份：2008

卷号：28

期号：9

起止页码：4602-4608

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家科技部科技基础性工作专项资助项目(2005DIB3J146);中国林业科学院青年基金资助项目(2005M09);国家科技支撑资助项目(2006BAD03A0303)~~

语种：中文

中文关键词：喀斯特石漠化;不同土地利用类型;土壤种子库;种类组成;植被恢复

外文关键词：Karst Rocky Desertification; different land use; soil seed banks; species composition; vegetation restoration

分类号：Q142;Q948

摘要：在贵州省普定县喀斯特石漠化地区通过种子萌发试验,对封山育林、退耕还林2 a、农耕地等3种不同土地利用类型的土壤种子库进行分析。结果表明,不同利用类型土壤中种子数量差异显著,封山育林土壤中平均种子密度为1664粒/m^2,退耕还林2 a土壤中平均种子密度为8060粒/m^2,农耕地土壤中平均种子密度为6239粒/m^2。土壤中的种子集中分布在表层0～5 cm范围内,随土层深度变化,土壤中所含种子数量和物种数呈减少的趋势。不同利用类型土壤种子库物种相似指数较低,物种数、多样性指数、均匀度及生态优势度指数以退耕还林地最大,农耕地高于封山育林地。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。封山育林地、退耕还林地属于进展演替,封山育林地处于较高演替阶段,农耕地属于逆行演替。应引进适宜物种以促进植被恢复。
Karst rocky area that is under severe desertification condition posed a serious attention in southwest China, because such area is expanding with a rate of 2% annually. Therefore, ecosystem restoration of the present problem area has been focused. Since, vegetation recovery is the first step of any restoration programme was conducted, by which, land cover will be safe for further wastage. Thus, three research sites were selected for regeneration study such as： （I） hill closing, （ I1 ） abandoned farmland, and （ ]]I） farmland. The objectives of the present study were （ 1 ） How land-used influences the species composition in the ecosystem, （2） what relationship exists between soil seed banks and vegetation restoration. Results indicated that the average seed density among three sites was in the range of 1664 --8060 seeds per m2 , being maximum in the abandoned farmland and minimum in the hill closing land. However, effect of soil depth on seeds number was significantly different as highest seeds number was found in 0 -- 5cm soil layer and showed decreasing trend with increases soil depth. The similarity indices of different type seed banks were low, and distinctly varied. These indices （species, diversity, evenness and dominant indices） were significantly better in the site Ⅱ followed by Ⅲ and Ⅰ. Most abundant herbaceous species composition was the member of Asteraceae and Poaceae family indicated the recovery laid early stage of primary succession. The lack of tree species seeds in the soil seed banks indicating that recovery of vegetation in short span of time, some suitable species should be introduced for ideal restoration.