Impacts of long-term snow climate change on a high-elevation cold desert shrubland, California, USA
Impacts of long-term snow climate change on a high-elevation cold desert shrubland, California, USA
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DOI：
10.1007/s11258-012-0164-8
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发表时间：
2013-01
期刊：
影响因子：
1.7
通讯作者：
M. Loik;A. Griffith;H. Alpert
中科院分区：
文献类型：
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作者：
M. Loik;A. Griffith;H. Alpert
在美国加州东部的灌木-针叶林景观镶嵌图上设置了50 km长的防雪栅栏，对50年来人为控制积雪深度和融化时间的生态响应进行了评估。我们比较了如何增加，减少，和环境积雪深度的影响模式的植被群落组成，火灾燃料的积累，每年的树木年轮生长。我们还测试了积雪深度对土壤碳储量的影响的基础上，总C含量下的两个共同优势的灌木物种（ArtemisiatridentaandPurshia tridentata）相比，开放，灌木间的网站。积雪深度的增加降低了固氮灌木的覆盖度。tridentatabut而不是水重新分配灌木A.三叉戟。年轮生长是更大的+雪地块和较低的-雪地块的针叶松jeffreyi，但不是forPinus扭叶松。禾本科覆盖和地上生物量表明较高的火灾燃料积累的积雪深度增加。死灌木茎生物量更大，无论积雪深度增加或减少。结果表明，社区的转变，改变树木的生长，碳储存的反馈，并改变火燃料积累的结果，在雪的深度和融化时间的变化，这个高海拔，雪为主的生态交错带在未来的气候情景下，设想增加或减少雪的深度。
Ecological responses to 50-year old manipulations of snow depth and melt timing were assessed using snow fences arrayed across 50 km of a shrub–conifer landscape mosaic in eastern California, USA. We compared how increased, decreased, and ambient snow depth affected patterns of vegetation community composition, fire fuel accumulation, and annual tree ring growth. We also tested the effect of snow depth on soil carbon storage based on total C content under the two co-dominant shrub species (ArtemisiatridentataandPurshia tridentata) in comparison with open, intershrub sites. Increased snow depth reduced the cover of the N-fixing shrubP. tridentatabut not the water-redistributing shrubA. tridentata. Annual ring growth was greater on +snow plots and lower on −snow plots for the coniferPinus jeffreyibut not forPinus contorta. Graminoid cover and aboveground biomass indicated higher fire fuel accumulation where snow depth was increased. Dead shrub stem biomass was greater regardless of whether snow depth was increased or decreased. Results demonstrate community shifts, altered tree growth, feedbacks on carbon storage, and altered fire fuel accumulation as a result of changes in snow depth and melt timing for this high-elevation, snow-dominated ecotone under future climate scenarios that envision increased or decreased snow depth.