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首页> 外文期刊>The holocene >Holocene subalpine forest-parkland dynamics in Big Cottonwood Canyon,Wasatch Mountains, Utah, USA
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Holocene subalpine forest-parkland dynamics in Big Cottonwood Canyon,Wasatch Mountains, Utah, USA

机译：全新世苏尔坡森林 - 公园动态大杨杨峡谷，穆斯哈山，犹他州，美国

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Understanding long-term responses of subalpine forest-parklands to Holocene climate variability in local context is critical for better managing those ecosystems under future climate change. Available records suggest that western North American subalpine forest-parkland ecosystems responded to Holocene climate in various ways at different places. Here we present a Holocene record of upper montane forest-parkland dynamics from Silver Lake in Big Cottonwood Canyon, Wasatch Range, on the Great Basin’s eastern margin. Our results show that at the end of the Younger Dryas, Silver Lake was surrounded by open Pinus/Picea parkland mixed with Artemisia subalpine steppe. By ~9.0 cal ka BP Picea began to expand in response to early Holocene summer warming and enhanced winter moisture. Picea -dominated forests prevailed from ~8.0 to 5.0 cal ka BP, after which time a more open Picea parkland developed. By ~3.5 cal ka BP Pinus increased under cooling conditions, and Picea gradually rebounded to form the mixed conifer forest present today. The Silver Lake long-term record of moderate shifts within an upper montane ecosystem is consistent with other regional sites in the timing of major vegetation changes reflecting large-scale climatic forcings, but distinct in response to local factors including the importance of enhanced lake-effect snowpack and the absence of competing lower montane Pinus . These local factors may help account for the long-term stability of Picea -dominated forests in the area.
机译：了解苏尔坡森林 - 公园在当地环境中对全茂气候变化的长期回应对于更好地管理这些生态系统，在未来的气候变化下，这是至关重要的。可用记录表明，西北美洲苏联森林 - 公园生态系统在不同的地方以各种方式响应全新世气候。在这里，我们展示了来自大杨伍德峡谷的银湖上山地森林 - 公园动力学的全新世记录，在大盆地的东部边缘。我们的研究结果表明，在较年轻的Dryas末端，Silver Lake是由Open Pinus / Picea Parkland与Artemisia Subalpine Steppe混合的露天湖。到〜9.0 Cal Ka BP Picea开始响应全新世夏季变暖和增强的冬季水分。 Picea-addinated森林占〜8.0至5.0 Cal Ka BP，之后是一个更开放的Picea Parkland开发。 〜3.5 Cal Ka BP Pinus在冷却条件下增加，Picea逐渐反弹，形成今天的混合针叶树林。在山地山体内系统内的中等变化中的银湖长期记录与主要植被时机的其他区域网站一致，反映了大规模气候强调，但截然不同，以应对当地因素，包括增强湖泊效应的重要性积雪和缺乏竞争的下蒙尾疙瘩。这些本地因素可能有助于考虑该地区的Picea-noded森林的长期稳定性。

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