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Spatial structure and species composition of soil seed banks in moving sand dune systems of northeast China

查看全文 作　　者：Chunping [1,2]Miao;Xuehua [1]Li;Meiyu [1,2]Jia;Xu [1,2]Han;Deming [1]Jiang 高影响力作者 机构地区：[1]Institute of Applied Ecology, Chinese Academy of Sciences,Shenyang 110016, People's Republic of China;[2]University of Chinese Academy of Sciences, Beijing 100049,People's Republic of China高影响力机构 出　　处：《Journal of Forestry Research》索引2016年第27卷第1期,共6页高影响力期刊 基　　金：supported by National Natural Science Foundation of China(41271115) 摘　　要：Soil seed banks can provide a mechanistic for understanding the recruitment dynamics and can inform conservation management of ecosystems. To investigate the contribution of soil seed banks to vegetation restoration in moving sand dune systems, we compared seed structure and species similarity between soil seed banks and standing vegetation among moving sand dunes, ecotones and dune slacks in northeast China. Average seed density in dune slacks was greater than in ecotones or moving sand dunes.Seed density in the soil layer of 0–10 cm was greater than at 10–20 cm both in the moving sand dunes and the ecotones, but seed densities were similar at depths of 10–20and 20–30 cm in moving sand dunes. Moreover, the spatial autocorrelation of seed density on moving sand dunes was weak but was strong on the ecotones and dune slacks. The species in the soil seed bank of moving sand dune systems were nearly all annuals, and the low similarity was mainly due to the lack of perennial species that were common in standing vegetation. Consequently, vegetation restoration cannot mainly rely on the soil seed banks in the movingsand dunes and more attention should be paid to protection of the dune slacks because they are the main source of seed disperse and seedling recruitment in moving sand dune systems. 关 键 词：土壤种子库 流动沙丘 物种组成 移动 空间结构 东北 生态系统 生态交错带
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