The Vertical Distribution of Soil Seed Bank and Its Restoration Implication in an Active Sand Dune of Northeastern Inner Mongolia, China
The Vertical Distribution of Soil Seed Bank and Its Restoration Implication in an Active Sand Dune of Northeastern Inner Mongolia, China
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DOI：
10.1002/ldr.2428
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发表时间：
2016-02
影响因子：
4.7
通讯作者：
J. Qian;Zhimin Liu;Jean-Hugues B. Hatier;Bo Liu
中科院分区：
文献类型：
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作者：
J. Qian;Zhimin Liu;Jean-Hugues B. Hatier;Bo Liu
尽管已对不同生态系统的表层土壤种子库的功能和特征进行了描述，但对深层土壤种子库的时空格局及其对活动沙丘植被恢复的生态意义还没有得到充分的探讨。2007年和2008年，在内蒙古东北部活跃和稳定的沙丘中国上，对沙丘位置、土壤深度和季节的种子密度进行了调查。稳定沙丘0~10 cm土层种子占土壤种子库总量的60%，而活跃沙丘50~100 cm土层种子占总种子库的40%以上。在稳定沙丘上，种子密度随土层深度的增加而显著下降，而在活跃沙丘上，种子密度在0~100 cm土壤剖面上相对恒定。在活动沙丘上，种子密度随土壤深度波动，表明种子随时间向上或向下迁移。稳定沙丘土壤种子库以一年生非沙生植物种子为主，活跃沙丘土壤种子库以先锋沙生植物为主。我们的数据表明，活跃沙丘深层土壤中的种子占整个土壤种子库的很大比例。由于风蚀的影响，深层土壤中的种子可能会逐渐暴露在浅层土壤中，并可能有助于活跃沙丘上的种群招募和植被恢复。版权所有©2015 John Wiley&Sons，Ltd.
Although the functions and characteristics of soil seed banks in topsoil layers have been described for various ecosystems, the spatiotemporal pattern of the seed bank in deep soil and its ecological implications for vegetation restoration of active sand dune have not been fully explored. In 2007 and 2008, seed densities with regard to dune position, soil depth and season were investigated on an active and a stabilized sand dune of northeastern Inner Mongolia, China. Seeds in the 0–10 cm topsoil layer accounted for 60% of total soil seed bank on the stabilized sand dune, while more than 40% of seeds were stored in the 50–100 cm layers on the active sand dune. Seed density declined significantly with soil depth on the stabilized sand dune, but it was relatively constant across the 0–100 cm soil profile on the active sand dune. Seed density fluctuated with soil depth on the active sand dune suggesting that seeds were either relocated upward or downward over time. Seeds of annual non‐psammophytic species accounted for the majority of soil seed bank on the stabilized sand dune, while pioneer psammophytes contributed more to the soil seed bank of the active sand dune. Our data suggest that seeds in the deep soil layers of active sand dunes account for a large proportion of the whole soil seed bank. Because of the effect of wind erosion, seeds in deep soil could be gradually exposed to shallow soil layers and potentially contribute to population recruitment and vegetation restoration on active sand dunes. Copyright © 2015 John Wiley & Sons, Ltd.