Does typhoon disturbance in subalpine forest have long-lasting impacts on saproxylic fungi, bryophytes, and seedling regeneration on coarse woody debris?
Does typhoon disturbance in subalpine forest have long-lasting impacts on saproxylic fungi, bryophytes, and seedling regeneration on coarse woody debris?
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DOI：
10.1016/j.foreco.2018.09.036
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发表时间：
2019-01-15
影响因子：
3.7
通讯作者：
Song, Zewei
中科院分区：
文献类型：
--
作者：
Fukasawa, Yu;Ando, Yoko;Song, Zewei
风暴扰动对亚高山森林生态系统产生巨大影响。由于气候变化导致风暴频率和强度不断增加，评估风暴扰动的长期影响和机制对于保护亚高山森林具有重要意义。亚高山针叶树属物种，如云杉和铁杉，需要粗木本碎片（CWD），如原木和树桩来进行幼苗定殖；因此，它们的建立受CWD状况的影响很大，这在很大程度上取决于真菌分解菌群落和腐木苔藓植物群落的活动。由于已知亚高山森林中的 CWD 腐烂和相关的生态演替过程需要数十年的时间，因此我们假设风暴扰动对真菌群落、其木材腐烂功能、腐木苔藓植物群落和幼苗生长具有长期影响。为了验证这一假设，我们调查了 55 年前遭受大台风干扰的森林地点的真菌、苔藓植物和幼苗群落，并将它们与日本中部周围未受干扰的针叶林进行了比较。与我们的假设相反，Illumina 对从木材样本中获得的 rDNA 中的真菌 ITS1 区域进行的测序并未表明过去的干扰对当前的真菌群落有明显的影响。此外，各种木材腐烂类型的发生频率在受干扰和未受干扰的地块之间没有显着差异。然而，干扰影响了苔藓植物群落，这对云杉的幼苗密度产生了强烈影响。 hondoensis、铁杉和桦木属植物。这些结果表明，震源区之前的台风扰动对 CWD 的生物相互作用和幼苗再生产生了长期影响，但这些影响可能不能归因于扰动对 CWD 真菌群落及其木材腐烂功能的影响。
Storm disturbance has a huge impact on subalpine forest ecosystems. Evaluating the long-term effects and mechanisms of storm disturbance is of great significance for conservation of subalpine forests as frequency and intensity of storms are increasing because of the climate change. Species of subalpine conifer tree genera such as Picea and Tsuga need coarse woody debris (CWD) such as logs and stumps for seedling colonization; thus, their establishment is greatly affected by the condition of CWD, which largely depends on the activity of fungal decomposer communities and saproxylic bryophyte communities. Because the process of CWD decay and associated ecological succession is known to take several decades in subalpine forests, we hypothesized that storm disturbance has long-lasting effects on fungal communities, their wood decay function, saproxylic bryophyte communities, and seedling establishment. To test this hypothesis, we surveyed fungal, bryophyte, and seedling communities at forest sites that had been disturbed by a large typhoon 55 years ago and compared them with those of surrounding undisturbed coniferous forest in central Japan. Contrary to our hypothesis, Illumina sequencing for the fungal ITS1 region in rDNA obtained from wood samples did not show that past disturbance had an obvious effect on current fungal communities. Also, the frequencies of occurrence of various wood decay types were not significantly different between disturbed and undisturbed plots. However, disturbance affected bryophyte communities, which had strong effects on the seedling densities of Picea jezoensis var. hondoensis, Tsuga diversifolia, and Betula spp. These results suggest that the previous typhoon disturbance in the focal area had long-lasting effects on biotic interactions and seedling regeneration on CWD, but these effects might not be attributable to the impacts of disturbance on CWD fungal communities and their wood decay function.