...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >An ecosystem model for tropical forest disturbance and selective logging
【24h】

An ecosystem model for tropical forest disturbance and selective logging

机译：热带森林干扰和选择性伐木的生态系统模型

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

A new three-dimensional version of the Carnegie-Ames-Stanford Approach (CASA) ecosystem model (CASA-3D) was developed to simulate regional carbon cycling in tropical forest ecosystems after disturbances such as logging. CASA-3D has the following new features: (1) an alternative approach for calculating absorbed photosynthetically active radiation (APAR) using new high-resolution satellite images of forest canopy gap fraction; (2) a pulse disturbance module to modify aboveground carbon pools following forest disturbance; (3) a regrowth module that simulates changes in community composition by considering gap phase regeneration; and (4) a radiative transfer module to simulate the dynamic three-dimensional light environment above the canopy and within gaps after forest disturbance. The model was calibrated with and tested against field observations from experimental logging plots in the Large-scale Biosphere Atmosphere Experiment in Amazonia (LBA) project. The sensitivity of key model parameters was evaluated using Monte Carlo simulations, and the uncertainties in simulated NPP and respiration associated with model parameters and meteorological variables were assessed. We found that selective logging causes changes in forest architecture and composition that result in a cascading set of impacts on the carbon cycling of rainforest ecosystems. Our model sensitivity and uncertainty analyses also highlight the paramount importance of measuring changes in canopy gap fraction from satellite data, as well as canopy light-use efficiency from ecophysiological measurements, to understand the role of forest disturbance on landscape and regional carbon cycling in tropical forests. In sum, our study suggests that CASA-3D may be suitable for regional-scale applications to assess the large-scale effects of selective logging, to provide guidance for forest management, and to understand the role of forest disturbance in regional and global climate studies.
机译：开发了卡内基-艾姆斯-斯坦福方法（CASA）生态系统模型（CASA-3D）的新的三维版本，以模拟诸如伐木等干扰后热带森林生态系统中的区域碳循环。 CASA-3D具有以下新功能：（1）使用森林冠层间隙分数的新高分辨率卫星图像来计算吸收的光合有效辐射（APAR）的替代方法; （2）脉冲干扰模块，可在森林干扰后修改地上的碳库; （3）一个再生模块，通过考虑间隙相的再生来模拟群落组成的变化; （4）辐射传递模块，模拟森林扰动后冠层上方和间隙内的动态三维光环境。在Amazonia的大型生物圈大气实验（LBA）项目中，使用实验测井图对模型进行了校准并进行了测试。使用蒙特卡洛模拟评估关键模型参数的敏感性，并评估模拟NPP和与模型参数和气象变量相关的呼吸的不确定性。我们发现选择性伐木会导致森林结构和组成的变化，从而对雨林生态系统的碳循环产生一系列连锁影响。我们的模型敏感性和不确定性分析还强调了从卫星数据测量冠层间隙分数变化以及从生态生理学测量来测量冠层光利用效率的最重要意义，以了解森林干扰对热带森林景观和区域碳循环的作用。总而言之，我们的研究表明，CASA-3D可能适合区域规模的应用，以评估选择性伐木的大规模影响，为森林管理提供指导，并了解森林干扰在区域和全球气候研究中的作用。

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