Short‐term effects of moderate severity disturbances on forest canopy structure
Short‐term effects of moderate severity disturbances on forest canopy structure
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中等严重程度干扰对森林冠层结构的短期影响
DOI：
10.1111/1365-2745.14145
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发表时间：
2023
影响因子：
5.5
通讯作者：
Hardiman, Brady S.
中科院分区：
文献类型：
--
作者：
Choi, Dennis Heejoon;LaRue, Elizabeth A.;Atkins, Jeff W.;Foster, Jane R.;Matthes, Jaclyn Hatala;Fahey, Robert T.;Thapa, Bina;Fei, Songlin;Hardiman, Brady S.
中度干扰，即不导致林分更替的干扰，在生态系统动力学中起着重要作用。尽管中度严重干扰普遍存在，并对森林功能产生重大影响，但人们对它们对森林冠层结构的影响以及这些影响在不同干扰严重程度和干扰类型的时间范围内的差异知之甚少。利用国家生态观测站网络项目的纵向数据，评估了3种中等强度的压力干扰（山毛榉树皮病、铁杉绵蚜和翠绿灰螟，它们具有持续干扰和持续死亡的特征）和3种中等强度的脉冲干扰（春腐蛾、海绵蛾和地火）的影响。这与美国东部温带森林冠层结构的离散和相对较短的死亡率有关。我们研究了(1)光探测和测距（LiDAR）衍生的冠层结构指标如何响应干扰而变化；(2)初始冠层复杂性是否会随着时间的推移抵消干扰对冠层结构的影响。我们使用了一个混合效应建模框架，其中包括一个非线性的时间项来表示干扰引起的冠层结构的变化，以及时间与干扰强度和初始冠层复杂性之间的相互作用。高强度的压力和脉冲干扰抑制了冠层高度的增长，而低强度的脉冲干扰促进了冠层高度的增长。此外，随着时间的推移，高强度脉冲扰动促进了冠层复杂性的增加。对于初始冠层复杂性的影响，我们发现扰动样地的初始冠层复杂性改变了中度扰动的效果，表明潜在的恢复效应。本研究使用激光雷达数据的重复测量来研究中度干扰对森林冠层结构各维度的影响，包括高度、开放度、密度和复杂性。我们的研究表明，随着时间的推移，压力和脉冲干扰都可以抑制冠层高度的增长。然而，虽然无法清楚地检测到压力干扰对冠层结构其他维度的影响（可能是由于补偿性生长），但使用多时相激光雷达数据，脉冲干扰随时间的影响更明显。此外，我们的研究结果表明，冠层复杂性可能有助于减轻中度干扰对冠层结构的影响。总的来说，我们的研究强调了多时间激光雷达数据对评估中度严重干扰引起的森林冠层结构变化的有用性。
Moderate severity disturbances, those that do not result in stand replacement, play an essential role in ecosystem dynamics. Despite the prevalence of moderate severity disturbances and the significant impacts they impose on forest functioning, little is known about their effects on forest canopy structure and how these effects differ over time across a range of disturbance severities and disturbance types.Using longitudinal data from the National Ecological Observatory Network project, we assessed the effects of three moderate severity press disturbances (beech bark disease, hemlock woolly adelgid and emerald ash borer, which are characterized by continuous disturbance and sustained mortality) and three moderate severity pulse disturbances (spring cankerworm moth, spongy moth and ground fire, which are associated with discrete and relatively short mortalities) on temperate forest canopy structure in eastern US. We studied (1) how light detection and ranging (LiDAR)‐derived metrics of canopy structure change in response to disturbance and (2) whether initial canopy complexity offsets impact of disturbances on canopy structure over time. We used a mixed‐effects modelling framework which included a non‐linear term for time to represent changes in canopy structure caused by disturbance, and interactions between time and both disturbance intensity and initial canopy complexity.We discovered that high intensity of both press and pulse disturbances inhibited canopy height growth while low intensity pulse disturbances facilitated it. In addition, high intensity pulse disturbances facilitated increases in the complexity of the canopy over time. Concerning the impact of initial canopy complexity, we found that the initial canopy complexity of disturbed plots altered the effects of moderate disturbances, indicating potential resilience effects.Synthesis. This study used repeated measurements of LiDAR data to examine the effects of moderate disturbances on various dimensions of forest canopy structure, including height, openness, density and complexity. Our study indicates that both press and pulse disturbances can inhibit canopy height growth over time. However, while the impact of press disturbances on other dimensions of canopy structure could not be clearly detected, likely because of compensatory growth, the impact of pulse disturbances over time was more readily apparent using multi‐temporal LiDAR data. Furthermore, our findings suggest that canopy complexity might help to mitigate the impact of moderate disturbances on canopy structures over time. Overall, our research highlights the usefulness of multi‐temporal LiDAR data for assessing the structural changes in forest canopies caused by moderate severity disturbances.
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影响因子：
16.6
作者：
Sommerfeld A;Senf C;Buma B;D'Amato AW;Després T;Díaz-Hormazábal I;Fraver S;Frelich LE;Gutiérrez ÁG;Hart SJ;Harvey BJ;He HS;Hlásny T;Holz A;Kitzberger T;Kulakowski D;Lindenmayer D;Mori AS;Müller J;Paritsis J;Perry GLW;Stephens SL;Svoboda M;Turner MG;Veblen TT;Seidl R
通讯作者：
Seidl R
非线性树木生长动力学预测对干扰的恢复能力
影响因子：
2.7
作者：
S. Billings;S. Glaser;A. Boone;F. Stephen
通讯作者：
F. Stephen
秋溃疡虫（鳞翅目：尺蛾科），北美阔叶树和灌木的原生落叶虫
影响因子：
2.8
作者：
M. Darr;D. Coyle
通讯作者：
D. Coyle
影响因子：
5
作者：
Boucher, Peter Brehm;Hancock, Steven;Schaaf, Crystal
通讯作者：
Schaaf, Crystal
影响因子：
3.2
作者：
Edgar, Christopher B.;Westfall, James A.
通讯作者：
Westfall, James A.