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Inter and intra-annual links between climate, tree growth and NDVI: improving the resolution of drought proxies in conifer forests
International Journal of Biometeorology ( IF 3.2 ) Pub Date : 2021-07-15 , DOI: 10.1007/s00484-021-02170-5
Marín Pompa-García 1 , J Julio Camarero 2 , Michele Colangelo 2, 3 , Marcos González-Cásares 1
Affiliation  

The inter- and intra-annual variability in radial growth reflects responses to climatic variability and water shortage, especially in areas subjected to seasonal drought. However, it is unknown how this variability is related to forest productivity, which can be assessed by measuring changes in canopy greenness and cover through remote sensing products as the Normalized Difference Vegetation Index (NDVI). We combine xylogenesis with measurements of inter-annual changes in seasonal wood production (earlywood width, adjusted latewood width) and NDVI to improve the understanding of climate and drought impacts on growth and forest productivity in a Pinus teocote stand located in northern Mexico. Cambial dynamics accelerated in March and a high production of radially enlarging and thickening tracheids were observed from April to October and from June to October, respectively. Tracheid maturation was very active in October when latewood production peaked. Wet conditions in winter-spring and summer-autumn enhanced earlywood and latewood production, respectively. Earlywood and latewood were constrained by long (4–10 months) and short (2–3 months) droughts, respectively. The earlywood production depended on April soil moisture, which agrees with the peak of radially enlarging tracheid production found during that month. Aligning drought proxies at inter- and intra-annual scales by using growth and productivity measures improves our understanding of conifer forest responses to water shortage.



中文翻译:

气候、树木生长和 NDVI 之间的年际和年内联系:提高针叶林干旱指标的分辨率

径向增长的年际和年内变化反映了对气候变化和缺水的反应,特别是在遭受季节性干旱的地区。然而,尚不清楚这种可变性与森林生产力的关系,可以通过遥感产品测量冠层绿度和覆盖度的变化作为归一化差异植被指数(NDVI)来评估。我们将木质发生与季节性木材生产(早材宽度、调整后的晚材宽度)和 NDVI 的年际变化测量相结合,以提高对气候和干旱对松树生长和森林生产力的影响的理解位于墨西哥北部。3 月形成层动力学加速,4 月至 10 月和 6 月至 10 月分别观察到大量径向扩大和增厚的管胞。10 月,当晚材产量达到顶峰时,管胞成熟非常活跃。冬春季和夏秋季的潮湿条件分别提高了早材和晚材的产量。早材和晚材分别受到长期(4-10 个月)和短期(2-3 个月)干旱的限制。早材产量取决于四月的土壤水分,这与该月发现的径向扩大管胞产量的峰值一致。通过使用增长和生产力措施,在年际和年内尺度上调整干旱代理可以提高我们对针叶林对缺水反应的理解。

更新日期:2021-07-15
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