• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecosystems >Soil respiration at dominant patch types within a managed northern Wisconsin landscape
【24h】

Soil respiration at dominant patch types within a managed northern Wisconsin landscape

机译：威斯康星州北部受管理景观中主要斑块类型的土壤呼吸

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

Soil respiration (SR), a substantial component of the forest carbon budget, has been studied extensively at the ecosystem, regional, continental, and global scales, but little progress has been made toward understanding SR over managed forest landscapes. Soil respiration is often influenced by soil temperature (T-s), soil moisture (M-s), and type of vegetation, and these factors vary widely among the patch types within a landscape. We measured SR, T-s, M-s, and litter depth (LD) during the 1999 and 2000 growing seasons within six dominant patch types (mature northern hardwoods, young northern hardwoods, clear-cuts, open-canopy Jack pine barrens, mature Jack pine, and mature red pine) on a managed forest landscape in northern Wisconsin, USA. We compared SR among and within the patch types and derived empirically based models that relate SR to T-s, M-s, and LD. Increased levels of soil moisture and higher temperatures in June-September 1999 may have accounted for the up to 37% overall higher SR than in this same period in 2000. In 2000, SR and T-s values were lower, and the sites may have been experiencing slight water limitations, but in general T-s was a much more accurate predictor of SR during this year. Empirical predictions of SR within each patch type derived from continuous T-s measurements were in close agreement with measured values of SR during 2000, but eight of 22 of the simulated values were significantly different (alpha = 0.05) from the rates measured in 1999. The young hardwoods consistently had the highest SR, whereas the pine barrens had the lowest. Results from our field studies and empirical models can help land managers assess landscape responses to potential disturbances and climatic changes.
机译：土壤呼吸（SR）是森林碳收支的重要组成部分，已经在生态系统，区域，大陆和全球范围内进行了广泛的研究，但在管理林地景观方面对SR的理解却很少。土壤呼吸通常受土壤温度（T-s），土壤湿度（M-s）和植被类型的影响，并且这些因素在景观中的斑块类型之间差异很大。我们测量了1999年和2000年生长季节内六种主要斑块类型（成熟的北部硬木，北部的年轻硬木，清晰的灌木丛，开阔的杰克松松树，成熟的杰克松树，和成熟的红松）在美国威斯康星州北部的受管理森林景观上。我们比较了补丁类型之间和之内的SR，并得出了基于经验的，将SR与T-s，M-s和LD相关的模型。与2000年同期相比，1999年6月至9月土壤湿度水平升高和温度升高可能使SR总体提高了37％。2000年的SR和Ts值较低，这些地点可能一直在经历轻微的水限制，但总的来说，Ts是今年更准确的SR预测指标。从连续Ts测量得出的每个贴片类型中SR的经验预测与2000年期间SR的测量值非常吻合，但是22个模拟值中的八个与1999年测得的比率显着不同（alpha = 0.05）。硬木始终具有最高的SR，而松树贫瘠的具有最低。我们的实地研究和经验模型的结果可以帮助土地管理人员评估景观对潜在干扰和气候变化的响应。

著录项

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