Seed sources and safe sites as drivers of Larixcajanderi regeneration following wildfire in the Siberian Arctic
Seed sources and safe sites as drivers of Larixcajanderi regeneration following wildfire in the Siberian Arctic
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种子来源和安全地点是西伯利亚北极地区野火后落叶松再生的驱动力
DOI：
10.1002/ecs2.4617
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发表时间：
2023
期刊：
影响因子：
2.7
通讯作者：
McEwan, Ryan W.
中科院分区：
文献类型：
--
作者：
Borth, Eric B.;Alexander, Heather D.;Zimov, Nikita;McEwan, Ryan W.
位于西伯利亚大片地区的兴安落叶松生长在富含碳的永久冻土之上，并对其起到保护作用。这些森林的再生对气候系统的长期反馈具有重要影响，在林分替代火灾之后，它们的再生最强烈。该项目的目标是评估再生限制的来源。位于西伯利亚东北部的Cajanderiforests。我们重点研究了(1)不同密度林分的更新潜力和(2)分析了立苗模式与景观中微立地条件(安全立地)的关系。在2017年和2018年夏季，通过球果计数和林分调查，对17个成熟L。在Kolyma河北部(161.3641°E，69.5477°N)沿线约800 km2的15个地区，评估了与安全场地可用性有关的Cajanderands.L.cajanderands.l.cajanderands.L.cajanderers的招募模式。林分内乔木密度与平均树球数呈负相关，中密度林分单位面积球果产量高于高密度林分和低密度林分。我们发现强有力的证据表明，在低地比高地，安全的地点对幼苗的建立非常重要。这种模式的生物学解释目前尚不清楚，然而，我们假设这种模式是由一些低地持续潮湿(沼泽)的土壤作为苗木建立的限制因素所驱动的。总体而言，这些数据表明森林密度、繁殖可获得性、火灾、安全景观定居和苗木建立之间可能存在复杂的联系，这些联系可能调节未被研究的地区的长期动态。西伯利亚北极的珊瑚虫。
Larix cajanderiforests, which occupy vast regions of Siberia, grow atop and protect carbon‐rich permafrost. Regeneration of these forests has important implications for long‐term feedbacks into the climate system and their regeneration is strongest following stand‐replacing fires. The goal of this project was to assess sources of regeneration limitation inL. cajanderiforests in northeastern Siberia. We focused on (1) regeneration potential of stands varying in tree density and (2) analyzing seedling establishment patterns in relationship to microsite conditions (safe sites) in the landscape. Seed sources were assessed through cone counts and stand surveys in the summers of 2017 and 2018 in 17 matureL. cajanderistands.L. cajanderirecruitment patterns in relationship to safe site availability were assessed in 15 areas, spanning approximately 800 km2along the northern portion of the Kolyma River (69.5477° N, 161.3641° E). Density of trees in a stand was negatively related to the number of cones that the average tree produced and stands of moderate density produced more cones per area than either high‐ or low‐density stands.L. cajanderiseedling establishment was facilitated by safe sites in the landscape. We discovered strong evidence that safe sites are considerably more important for seedling establishment in lowland sites than upland areas. The biological explanation for this pattern is presently unknown; however, we hypothesize this pattern is driven by persistently wet (marshy) soils in some lowland sites as a limiter of seedling establishment. Overall, these data suggest the potential for complex linkages between forest density, propagule availability, fire, safe sight colonization, and seedling establishment that may regulate long‐term dynamics in the understudiedL. cajanderiforests of the Siberian Arctic.