Continuous Waterlogging May Not Facilitate Germinability Maintenance of Sphagnum Spores
Continuous Waterlogging May Not Facilitate Germinability Maintenance of Sphagnum Spores
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DOI：
10.1007/s13157-017-0936-y
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发表时间：
2017-07
期刊：
影响因子：
2
通讯作者：
Lu Feng;Z. Bu;A. Mallik;Zu-Cheng Wang;Shan Liu;Yu‐Huan Wu
中科院分区：
文献类型：
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作者：
Lu Feng;Z. Bu;A. Mallik;Zu-Cheng Wang;Shan Liu;Yu‐Huan Wu
土壤中的埋藏深度影响种子和孢子在生态系统中的存活。然而，埋藏深度对泥炭藓孢子萌发力的影响却很少受到关注。在中国东北的一个泥炭地，我们进行了孢子埋藏实验，使用两个中空居住的物种，泥炭藓squarsumandS。fallax。我们假设i）S。squarosum孢子萌发力低于S. fallax，因为它在开阔地区的有限分布; ii）对于这两个物种来说，孢子萌发能力会随着埋藏深度的梯度沿着增加，因为更大的深度为孢子保存提供了更好的条件。孢子埋藏一年后，我们进行了实验室发芽生物测定，以测试孢子发芽率（GP）和发芽指数（GI）。孢子萌发率的测定。squarosum比S. fallax。这两个物种表现出至少40%的发芽率高埋在空心比在驼峰。总体孢子萌发率随埋深的增加而增加，最大萌发率分别在30和20 cm以下的丘和凹地表面，在地下水位波动发生。我们的结论是，虽然空洞是更好的栖息地孢子存储，持续的渍水可能不利于保持高发芽力的泥炭藓孢子。
Burial depth within soil affects the survival of seeds and spores in ecosystems. However, burial depth effect on germinability ofSphagnumspores received little attention. In a peatland in Northeast China, we conducted a spore burial experiment using two hollow dwelling species,Sphagnum squarrosumandS. fallax. We hypothesised that i)S. squarrosumwould show lower spore germinability thanS. fallaxbecause of its limited distribution in open area and ii) for both species there would be increased spore germinability along burial depth gradient because greater depth provides better conditions for spore preservation. After one-year spore burial, we conducted a laboratory germination bioassay to test spore germinability, determined by germination percentage (GP) and germination index (GI). Spore germinablity ofS. squarrosumwas >60% lower thanS. fallax. Both species showed at least 40% higher germinability when buried in hollows than in hummocks. Overall spore germinability increased with burial depth with maximum germinability at 30 and 20 cm below the surface of hummocks and hollows respectively, where water table fluctuation occurred. We conclude that although hollows are better habitats for spore storage, continuous waterlogging may not be favourable for maintaining high germinability ofSphagnumspores.