...
  • 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 >Nitrogen controls plant canopy light-use efficiency in temperate and boreal ecosystems
【24h】

Nitrogen controls plant canopy light-use efficiency in temperate and boreal ecosystems

机译：氮控制温带和北方生态系统中植物冠层的光利用效率

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

Optimum daily light-use efficiency (LUE) and normalized canopy photosynthesis (GEE*) rate, a proxy for LUE, have been derived from eddy covariance CO2 flux measurements obtained at a range of sites located in the mid to high latitudes. These two variables were analyzed with respect to environmental conditions, plant functional types (PFT) and leaf nitrogen concentration, in an attempt to characterize their variability and their potential drivers. LUE averaged 0.0182 mol/mol with a coefficient of variation of 37% (42% for GEE*). Foliar nitrogen N of the dominant plant species was found to explain 71% of LUE (n = 26) and 62% of GEE* (n = 44) variance, across all PFTs and sites. Mean Annual Temperature, MAT, explained 27% of LUE variance, and the two factors (MAT and N) combined in a simple linear model explain 80% of LUE and 76% GEE* variance. These results showed that plant canopies in the temperate, boreal and arctic zones fit into a general scheme closely related to the one, which had been established for plant leaves worldwide. The N-MAT- LUE relationships offer perspectives for LUE-based models of terrestrial photosynthesis based on remote sensing. On a continental scale, the decrease of LUE from the temperate to the arctic zone found in the data derived from flux measurements is not in line with LUE resulting from inversion of atmospheric CO2.
机译：最佳日光利用效率（LUE）和归一化冠层光合作用（GEE *）速率是LUE的替代指标，是从在中高纬度范围内的一系列地点获得的涡度协方差CO2通量测量得出的。针对环境条件，植​​物功能类型（PFT）和叶氮浓度对这两个变量进行了分析，以试图表征其变异性及其潜在驱动因素。 LUE平均为0.0182 mol / mol，变异系数为37％（GEE *为42％）。发现在所有PFT和位点上，优势植物种的叶氮N解释了71％的LUE（n = 26）和62％的GEE *（n = 44）变化。年平均温度MAT解释了27％的LUE方差，而两个因素（MAT和N）在简单的线性模型中的组合解释了80％的LUE和76％的GEE *方差。这些结果表明，在温带，北方和北极地区的植物冠层适合于与针对全球植物叶片建立的通用方案紧密相关的总体方案。 N-MAT-LUE关系为基于LUE的基于遥感的陆地光合作用模型提供了前景。在大陆范围内，从通量测量得出的数据中发现的从温带到北极地区的LUE降低与大气CO2反演导致的LUE不一致。

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