The fate of herbaceous seeds during topsoil stockpiling: Restoration potential of seed banks
The fate of herbaceous seeds during topsoil stockpiling: Restoration potential of seed banks
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DOI：
10.1016/j.ecoleng.2012.03.005
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发表时间：
2012-07-01
影响因子：
3.8
通讯作者：
Peco, Begona
中科院分区：
文献类型：
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作者：
Rivera, Desiree;Jauregui, Berta M.;Peco, Begona
在线性基础设施建设过程中清除的表土是公路边坡生态恢复最宝贵的资源之一，因为它含有高度集中的微生物、营养物质和种子。在施工过程中，表土堆积的方式可能会损害种子萌发和生存能力。为了评价表土贮藏时间和种子埋深对种子存活率、发芽率和死亡率的影响，采用时间(1~6个月)和埋深(0、5、30和50 cm)两个因素进行了三个重复的试验。在每个储藏深度，我们将来自5科10种天然草地植物的25粒种子埋在透气性尼龙袋中。还测量了每个物种的种子质量和种子对光(LI)和昼夜温度波动(DTF)的功能反应。用二项式气相色谱分析了种子在贮藏过程中的存活率、发芽率和死亡率。解释变量为家庭、埋深、时间、种子质量。Li和DTF回应。种子存活率随贮藏时间的延长而降低，随贮藏深度的增加而增加。种子损失是由于种子萌发和库存中的死亡。发芽率随时间的延长而增加，随埋深的增加而降低。该参数与LI、DTF呈负相关。死亡率随着时间和深度的增加而显著增加，并与种子质量呈负相关。结果表明，表土储备中可能存在有效种子的损失，特别是在大种子的情况下。我们的结果还强调了发芽所需的光照和检测昼夜温度波动作为实现更高土壤种子持久性的机制的功能作用。表土的正确管理对公路边坡的恢复起着决定性作用。种子萌发势随着贮藏时间和埋藏深度的增加而降低，种子的严重流失导致表层土壤贫化，而表层土壤是这些受干扰的生态系统恢复的主要自然资源。土壤贮藏层较深层的种子损失较小，因此短期的表土贮藏和较大的贮存量可以减少种子损失，从而增加表土的修复潜力。(C)2012爱思唯尔B.V.保留所有权利。
Topsoil removed during linear infrastructure construction is one of the most valuable resources for the ecological restoration of roadslopes, as it contains high concentrations of micro-organisms, nutrients and seeds. During construction work, topsoil is stockpiled in a way that can harm seed germination and survival capacity. In order to assess the effects of topsoil storage time and seed burial depth on seed survival, germination and mortality, an experiment with three replicates was conducted using two factors: time (1-6 months) and burial depth (0, 5, 30 and 50 cm). At each stockpile depth we buried 25 seeds from 10 natural grassland species (5 families) in permeable nylon sachets. Seed mass and seed functional responses to light (LI) and diurnal temperature fluctuations (DTF) were also measured for each species. Seed survival, germination and mortality during stockpiling were analyzed using binomial GLMs. Explanatory variables were family, depth of burial, time, seed mass. LI and DTF responses. Seed survival decreased with storage time but increases with depth. Seed losses were due to seed germination and mortality in the stockpile. Germination percentage increased with time but decreased with burial depth. This parameter was negatively related to LI and DTF. Mortality increased significantly with time and depth and was negatively related to seed mass.Results show that there may be a loss of viable seeds in topsoil stockpiles, particularly in the case of large seeds. Our results also underline the functional role of light requirements for germination and the detection of diurnal temperature fluctuations as mechanisms to achieve higher soil seed persistence. The correct management of topsoil is decisive for the restoration of roadslopes. Seed germination potential decrease with time of storage and burial depth, consequently a serious loss of seeds conducts an impoverishing of topsoil, which is the main natural resource for the restoration of these disturbed ecosystems. Viable seed loss is lower in deeper layers of the stockpile, so short-period topsoil storage and bigger stockpiles could reduce seed loss and increase thus the restoration potential of topsoil. (C) 2012 Elsevier B.V. All rights reserved.