Tree-ring isotopes capture interannual vegetation productivity dynamics at the biome scale
Tree-ring isotopes capture interannual vegetation productivity dynamics at the biome scale
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DOI：
10.1038/s41467-019-08634-y
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发表时间：
2019-02
影响因子：
16.6
通讯作者：
M. Lévesque;L. Andreu‐Hayles;William Kolby Smith;A. Park Williams;M. Hobi;Brady W. Allred;N. Pederson-N.
中科院分区：
文献类型：
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作者：
M. Lévesque;L. Andreu‐Hayles;William Kolby Smith;A. Park Williams;M. Hobi;Brady W. Allred;N. Pederson-N.
由于缺乏长期高分辨率数据，净初级生产力（NPP）的历史和未来趋势及其对全球变化的敏感性在很大程度上是未知的。在这里，我们测试了年分解的树木年轮稳定碳（δ13C）和氧（δ18O）同位素是否可以作为重建过去NPP的替代指标。将美国东部3种不同水文气候环境下4个站点的稳定同位素年表与卫星衍生的NPP产品进行了时间和空间比较，包括长期全球库存建模和制图研究（GIMMS3g） NPP（1982-2011）、最新的高分辨率Landsat NPP（1986-2015）和中分辨率成像光谱仪（MODIS, 2001-2015） NPP。研究表明，在美国东部，树木年轮同位素，特别是δ18O，与卫星估算的局地和大地理尺度的NPP有很强的相关性。这些发现为估算生物群系尺度上陆地生产力的年际变化和长期变化提供了重要突破。
Historical and future trends in net primary productivity (NPP) and its sensitivity to global change are largely unknown because of the lack of long-term, high-resolution data. Here we test whether annually resolved tree-ring stable carbon (δ13C) and oxygen (δ18O) isotopes can be used as proxies for reconstructing past NPP. Stable isotope chronologies from four sites within three distinct hydroclimatic environments in the eastern United States (US) were compared in time and space against satellite-derived NPP products, including the long-term Global Inventory Modeling and Mapping Studies (GIMMS3g) NPP (1982–2011), the newest high-resolution Landsat NPP (1986–2015), and the Moderate Resolution Imaging Spectroradiometer (MODIS, 2001–2015) NPP. We show that tree-ring isotopes, in particular δ18O, correlate strongly with satellite NPP estimates at both local and large geographical scales in the eastern US. These findings represent an important breakthrough for estimating interannual variability and long-term changes in terrestrial productivity at the biome scale.