黄河分洪对乌兰布和沙漠局地种子库特征影响
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引用本文:辛智鸣,董 雪,黄雅茹,罗凤敏,葛根巴图,郭 浩.黄河分洪对乌兰布和沙漠局地种子库特征影响[J].西北植物学报,2019,39(3):516~523
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辛智鸣1,2,3,董 雪2,黄雅茹2,罗凤敏2,3,葛根巴图1,2,3,郭 浩1* (1 中国林业科学研究院 荒漠化研究所, 北京 100091
2 中国林业科学研究院 沙漠林业实验中心, 内蒙古磴口015200
3 内蒙古磴口荒漠生态系统国家定位监测研究站, 内蒙古磴口015200) 
基金项目:中央级公益性科研院所基本科研业务费专项(CAFYBB2017QA029);
中文摘要:乌兰布和沙漠东北缘固定 半固定 流动沙地被黄河分洪区划分为:消落带水淹区段和未淹区段以及原生植被(对照)样带,通过萌发法对3个区段实地采样的土壤种子库物种组成、数量和分布特征进行分析,以探讨黄河分洪区消落带内土壤种子库对地上植被形成的保障能力和未来植物群落结构演替趋势,为黄河分洪区地表植被的恢复与重建提供理论依据。结果表明:(1)3个区段土壤种子库储量存在显著差异,种子库密度未淹区段(733粒·m-2)>对照样带(609粒·m-2)>水淹区段(176粒·m-2)。(2)随着土层深度的增加,土壤种子库密度呈现下降趋势;随着水淹干扰强度、水淹时间和水淹频率的增加,表层0~5 cm土壤种子库密度呈减小的趋势。(3)水淹区段土壤种子库物种分属4科10属10种,未淹区段分属5科14属14种,对照样带分属5科15属15种;其中藜科、禾本科为优势科,且3个区段土壤种子库均以一年生、多年生草本植物为主,表明种子库对地表植物群落的灌木层片的繁衍、更新和演替的贡献率很小。(4)与对照样带相比,水淹区段土壤种子库的Shannon Wiener多样性指数、Margalef丰富度指数和Pielou均匀度指数均显著降低,但未淹区段表现出了升高的趋势,且水淹区段和未淹区段相似性指数最大。
中文关键词:黄河分洪区  水淹干扰  土壤种子库  消落带
 
Characteristics of Soil Seed Banks in Water level fluctuating Zone of the Yellow River Diversion Area
Abstract:We made a germination test to study the characteristics of soil seed banks in the different sand dunes (fixed dune, semi fixed dune, mobile dune) of Yellow River diversion area water level fluctuating zone (including the flooded, non flooded and control areas of different sand dunes). This study was conducted to evaluate the seed density, species diversity and horizontal distribution pattern of soil seed banks in areas with different local conditions based on field sampling and an indoor bourgeoning experiment. In order to provide a theoretical basis for the restoration and reconstruction of the surface vegetation in the Yellow River diversion area, we discussed the soil seed bank in water level fluctuating zone of the Yellow River diversion area to guarantee the formation of above ground vegetation and the succession trend of plant community structure in the future. The results showed that: (1) there were significant differences in the soil seed bank of three water level fluctuating zones, The density of water level fluctuating zone soil seed bank is the following in order: non flooded area (733 seed perm2)>control area (609 seed perm2)>flooded area (176 seed perm2).(2) The seed density decreased with soil depth. With the intensification and prolonging of flooding, the amount of seeds in top soil (0-5 cm) tended to decrease.(3) A total of 10 species belonging to 4 families and 10 genera were detected in the soil seed bank of flooded area. A total of 14 species belonging to 5 families and 14 genera were detected in the soil seed bank of non flooded area. A total of 15 species belonging to 5 families and 15 genera were detected in the soil seed banks of control area. Most of them belong to Chenopodiaceae and Poaceae, which were annual and perennial herbage species. It indicated that soil seed banks have little contribution to regeneration and succession of shrub layers. (4) Compared with those in control area,all the species diversity indices, richness indices and evenness indices of the standing vegetation decreased significantly in flooded area, but increased in non flooded area.And the similarity index between the flooded and non flooded areas was the highest.
keywords:Yellow River diversion area  flooding disturbance  soil seed bank  water level fluctuating zone
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