Smoke promotes germination of peatland bryophyte spores
Smoke promotes germination of peatland bryophyte spores
复制标题
烟雾促进泥炭地苔藓植物孢子的萌发
DOI：
10.1093/jxb/erac420
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发表时间：
2023
影响因子：
6.9
通讯作者：
Bu Z-J
中科院分区：
文献类型：
--
作者：
Yusup S;Sundberg S;Ooi M;Sun Z;Zhang M;Wang M;Rydin H;Feng L;Chen X;Bu Z-J
北部泥炭地是全球重要的碳储存库。随着火灾发生频率的增加，苔藓植物的重建对其固碳至关重要。在火灾易发的生态系统中，对烟雾敏感的萌发是种子的共同特征，但在苔藓植物中尚未得到证实。为了探讨烟雾在火灾后泥炭地恢复中的潜在作用，我们测试了15种苔藓植物在烟雾-水处理后的孢子萌发。随后测试了不同实验室储存时间和埋藏深度/年龄（3-200年）的孢子对烟雾的响应性。烟熏提高了10个品种的发芽率和4个品种的发芽率。从开阔地到森林边缘，烟雾响应性沿火灾频率梯度增加，这与火灾适应特征维持的选择理论一致。烟雾能提高实验室储存1年而不是4年孢子的萌发能力，并显著提高自然埋藏在泥炭中长达200年的孢子的萌发能力。在不容易发生火灾的生态系统中，例如以湿地苔藓植物为主的生态系统，火灾的影响可能被忽视。我们的研究揭示了火灾频率增加可能导致物种优势变化的机制，这可能会影响泥炭地的长期碳固存。
Northern peatlands are globally important carbon stores. With increasing fire frequency, the re-establishment of bryophytes becomes crucial for their carbon sequestration. Smoke-responsive germination is a common trait of seeds in fire-prone ecosystems but has not been demonstrated in bryophytes. To investigate the potential role of smoke in post-fire peatland recovery, we tested the germination of spores of 15 bryophyte species after treatment with smoke-water. The smoke responsiveness of spores with different laboratory storage times and burial depths/age (3–200 years) was subsequently tested. Smoke increased the germination percentage for 10 of the species and the germination speed for four of these. Smoke responsiveness increased along the fire frequency gradient from open expanse to forest margin, consistent with the theory that this selects for the maintenance of fire-adapted traits. Smoke enhanced the germinability of 1-year but not 4-year laboratory-stored spores, and considerably increased the germinability of spores naturally buried in peat for up to~200 years. The effect of fire may be overlooked in non-fire-prone ecosystems, such as those in which wetland bryophytes dominate. Our study reveals a mechanism by which an increase in fire frequency may lead to shifts in species dominance, which may affect long-term carbon sequestration in peatlands.