• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Water resources research >Forest thinning impacts on the water balance of Sierra Nevada mixed-conifer headwater basins
【24h】

Forest thinning impacts on the water balance of Sierra Nevada mixed-conifer headwater basins

机译：森林砍伐对内华达山脉混合针叶树源水盆地水平衡的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Headwater catchments in the mixed-conifer zone of the American and Merced River basins were selectively thinned in 2012 to reduce the risk of high-intensity wildfire. Distributed observations of forest vegetation thinning, precipitation, snowpack storage, soil water storage, energy balance, and stream discharge from 2010 to 2013 were used to calculate the water balance and constrain a hydroecologic model. Using the spatially calibrated RHESSys model, we assessed thinning effects on the water balance. In the central-Sierra American River headwaters, there was a mean-annual runoff increase of 14% in response to the observed thinning patterns, which included heterogeneous reductions in leaf area index (-8%), canopy cover (-3%), and shrub cover (-4%). In the southern-Sierra Merced River headwaters, thinning had little impact on forest structure or runoff, as vegetation growth in areas not thinned offset reductions from thinning. Observed thinning effects on runoff could not be confirmed in either basin by measurements alone, in part because of the high variability in precipitation during the measurement period. Modeling results show that when thinning is intensive enough to change forest structure, low-magnitude vegetation reductions have greater potential to modify the catchment-scale water balance in the higher-precipitation central Sierra Nevada versus in the more water-limited southern Sierra Nevada. Hydrologic modeling, constrained by detailed, multiyear field measurements, provides a useful tool for analyzing catchment response to forest thinning.
机译：2012年，美国和默塞德河流域混合针叶树带的源头集水区有选择地变稀，以减少发生高强度野火的风险。利用分布观测资料，对2010年至2013年间森林植被稀疏，降水，积雪堆蓄，土壤水蓄积，能量平衡和水流排放进行观测，以计算水平衡并约束水生态模型。使用空间校准的RHESSys模型，我们评估了稀疏对水平衡的影响。在中美洲-塞拉河上游源头，由于观测到的稀疏模式，年均径流量增加了14％，包括叶面积指数（-8％），冠层覆盖率（-3％），和灌木覆盖（-4％）。在南部塞拉默塞德河上游水源，间伐对森林结构或径流几乎没有影响，因为未间伐的地区的植被生长抵消了间伐的减少。仅通过测量就无法在两个盆地中证实对径流的稀疏效应，部分原因是在测量期间降水变化很大。建模结果表明，与内陆南部水分较多的地区相比，在高降水量内华达中部地区，当强度降低到足以改变森林结构的程度时，低幅度植被的减少具有更大的潜力来改变集水规模的水平衡。水文模型受到详细的多年实地测量的约束，为分析流域对森林间伐的响应提供了有用的工具。

著录项

  • 来源
    《Water resources research》 |2017年第7期|5364-5381|共18页
  • 作者

    Saksa P. C.; Conklin M. H.; Battles J. J.; Tague C. L.; Bales R. C.;

  • 作者单位

    Univ Calif, Sierra Nevada Res Inst, Merced, CA 95340 USA;

    Univ Calif, Sierra Nevada Res Inst, Merced, CA 95340 USA;

    Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA;

    Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, Santa Barbara, CA 93106 USA;

    Univ Calif, Sierra Nevada Res Inst, Merced, CA 95340 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号