Indirect effects of bark beetle-generated dead wood on biogeochemical and decomposition processes in a pine forest
Indirect effects of bark beetle-generated dead wood on biogeochemical and decomposition processes in a pine forest
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树皮甲虫产生的死木对松林生物地球化学和分解过程的间接影响
DOI：
10.1007/s00442-018-4283-3
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发表时间：
2018
期刊：
影响因子：
2.7
通讯作者：
Riggins, John J.
中科院分区：
文献类型：
--
作者：
Siegert, Courtney M.;Clay, Natalie A.;Tang, Juliet D.;Garrigues, Lisa G.;Riggins, John J.
树皮甲虫的爆发在频率和强度上都在增加，在全球范围内产生了大量死亡树木的库存。在攻击期间，树木通过树皮甲虫预先接种口角类真菌，这已被证明增加了白蚁的存在和取食。这些事件反过来可能会改变分解过程中的生物地球化学循环。我们通过在温带松林中用蓝藻真菌对枯木进行实验接种来检验这些关系。在10个重复小区中，8个0.5米长的原木被接种了微小蛇口藻，8个被接种了蒸馏水。每次接种处理的原木的一半从上方用网笼屏障覆盖，以排除地上甲虫，同时允许地下分解者进入。一年后，所有处理的质量显著增加(34%)，水分含量显著降低(−17%)，但密度没有明显的一致变化。当存在屏障时，树皮中的C浓度增加了12%，当没有屏障和接种真菌时，边材中的C浓度增加了17%。接种真菌的原木树皮中的N浓度比接种真菌的原木高16%，当有屏障时，树皮中的N浓度高27%。接种真菌原木的A层土壤C：N比高出12%。此外，白蚁在接种真菌的原木中的存在是对照的四倍，白蚁的存在与边材中的C减少6%，边材和心材中的N增加11%有关。综上所述，这些结果表明，由树皮甲虫攻击产生的枯木在初始分解阶段有不同的生物地球化学反应，这可能对树皮甲虫爆发后森林中的C状态产生影响。
Bark beetle outbreaks are increasing in frequency and intensity, generating massive inventories of dead trees globally. During attacks, trees are pre-inoculated with ophiostomatoid fungi via bark beetles, which has been shown to increase termite presence and feeding. These events may, in turn, alter biogeochemical cycles during decomposition. We examined these relationships by experimentally inoculating dead wood with bluestain fungi in a temperate pine forest. Across ten replicate plots, eight 0.5 m-long logs were inoculated withOphiostoma minusand eight with distilled water. Half of the logs from each inoculation treatment were covered from above with a mesh cage barrier to exclude aboveground beetles while permitting access by belowground decomposers. After 1 year, significant increases in mass (34%) and decreases in moisture content (− 17%) were observed across all treatments, but no consistent changes in density were evident. C concentrations were 12% greater in bark when barriers were present and 17% greater in sapwood when barriers and inoculation fungi were absent. N concentrations were 16% greater in bark for fungal-inoculated logs and 27% greater when barriers were present. C:N ratios in A horizon soils under fungal-inoculated logs were 12% greater. Furthermore, termites were present fourfold more in fungal-inoculated logs than controls and the presence of termites was associated with 6% less C in sapwood and 11% more N in both sapwood and heartwood. Together these results suggest dead wood generated via bark beetle attacks has different biogeochemical responses during initial decomposition phases, which could have implications for the C status in forests following bark beetle outbreaks.
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DOI：
10.1016/j.scitotenv.2012.04.060
发表时间：
2012-07
期刊：
The Science of the total environment
影响因子：
--
作者：
J. V. Van Stan;D. Levia;S. Inamdar;M. Lepori-Bui;M. Mitchell
通讯作者：
J. V. Van Stan;D. Levia;S. Inamdar;M. Lepori-Bui;M. Mitchell
DOI：
10.1017/s0269727000007089
发表时间：
1996
期刊：
Proceedings of The Royal Society B: Biological Sciences
影响因子：
--
作者：
J. Hanula
通讯作者：
J. Hanula
影响因子：
2.7
作者：
M. Ulyshen;Richard P. Shefferson;Scott Horn;Melanie K. Taylor;B. Bush;C. Brownie;S. Seibold;M. Strickland
通讯作者：
M. Strickland
树皮甲虫杀死树木周围的生物地球化学热点
DOI：
--
发表时间：
2018
期刊：
Proceedings of the 19th biennial southern silvicultural research conference
影响因子：
--
作者：
Siegert, CM
通讯作者：
Siegert, CM
影响因子：
3.7
作者：
Morehouse, K.;Johns, T.;Kaye, A.
通讯作者：
Kaye, A.