摘要
利用退化荒草地附近种源地表层土壤,通过客土和人工播撒乔、灌木种子的方式对荒草地进行土壤种子库的补充,比较植被恢复地、种源地、对照裸地的土壤种子库组成、密度、多样性、地上植被生物量和土壤理化性质,研究土壤种子库对荒草地在植被恢复方面的改良作用,以便为今后退化土地的自然恢复提供理论依据。结果表明:植被恢复地土壤种子库物种数量比对照裸地增加6种,地上植被有常绿乔木及多种灌木物种出现,种子密度由843.75粒/m^2增加至3 645.83粒/m^2;土壤种子库Shannon-Wiener多样性指数和Margalef丰富度指数顺序由大到小均依次为:植被恢复地、种源地、对照裸地;与地上植被的相似性指数也由0.12增加到0.23;植被恢复地地上生物量分别是种源地和对照裸地的4.28倍、4.85倍;植被恢复地的持水量增加,土壤结构改善,有机质及N、P、K的含量均显著提高。
In this research,the seed bank of waste grassland was supplemented by using provenance surface soil near degraded waste grassland with seeds of trees and shrubs added in it.The effect of soil seed bank on natural vegetation restoration was studied by comparing the soil seed bank composition,density,diversity,above-ground biomass and soil physicochemical properties of vegetation restoration land,provenance and bare land which served as the control group,in order to provide theoretical support for the waste grassland vegetation natural restoration and reconstruction technology.The results showed that the soil seed bank of vegetation restoration land had 6more species than that of the controlling bare land,several kinds of shrubs and evergreen trees were appeared in the above-ground vegetation,the seed density was increased from 843.5seeds/m-2 to 3 645.83seeds/m-2;the order of soil seed bank diversity index and richness index were both vegetation restoration land provenance bare land the control group;the similarity index with above-ground vegetation wasalso increased from 0.12 to 0.23;the above-land biomass of vegetation restoration land were4.28 times and 4.85 times of the provenance and the controlling bare land,respectively;the water holding capacity of vegetation restoration land was continuously increasing,soil structure was improved,organics and N,P,K content were also significantly increased.
出处
《河北林果研究》
2015年第4期348-353,共6页
Hebei Journal of Forestry and Orchard Research
基金
国家林业公益性行业科研专项"环京津生态脆弱期生态经济植被建设技术研究"(201404214)
关键词
土壤种子库
荒草地
植被自然恢复
多样性
soil seed bank
waste grass land
vegetation natural restoration
diversity
