Carbon uptake by Douglas-fir is more sensitive to increased temperature and vapor pressure deficit than reduced rainfall in the western Cascade Mountains, Oregon, USA
Carbon uptake by Douglas-fir is more sensitive to increased temperature and vapor pressure deficit than reduced rainfall in the western Cascade Mountains, Oregon, USA
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美国俄勒冈州喀斯喀特山脉西部地区，花旗松吸收的碳对温度升高和蒸气压不足的影响比降雨量减少更敏感
DOI：
10.1016/j.agrformet.2022.109267
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发表时间：
2023
影响因子：
6.2
通讯作者：
Wondzell, Steven M.
中科院分区：
文献类型：
--
作者：
Jarecke, Karla M.;Hawkins, Linnia R.;Bladon, Kevin D.;Wondzell, Steven M.
了解树木对干旱的反应对于了解森林对全球气候变化的敏感性至关重要，这有助于为森林政策和管理决策提供信息。然而，在地中海气候、冬季多雨、夏季干燥的地区，针对气温上升和水资源限制，控制固碳和水通量的机制仍然只有部分了解。利用土壤-植物-大气模型(SPA)研究了水汽压亏缺(VPD)增加和降雨量减少对豆杉(Pseudotsuga Menziesii)树木水分和碳通量的影响。我们模拟了美国俄勒冈州喀斯喀特山脉西坡上的一棵50年生的道格拉斯冷杉林。模拟结果表明，夏季日最大VPD增加0.25-2.5kPa时，累积蒸腾作用增加1-3%，累积初级生产力减少3-25%。相反，春季和夏季降雨量减少10%-100%，累积蒸腾作用减少2%-16%，累积初级生产力减少0.5%-4%。蒸腾作用对降雨量的减少高度敏感，特别是在春末夏初，但对日最大VPD增加的敏感性要小得多。相比之下，总初级生产力对VPD的敏感性更高，夏季VPD的增加对总初级生产力的影响是降雨量减少的5-6倍。这些结果表明，气候变化预期的温度上升，加上VPD的增加，可能会降低森林生产力，而不考虑土壤水分的有效性。
Understanding how trees respond to drought is critical to understanding forest sensitivity to global climate change, which can help inform forest policy and management decisions. However, mechanisms governing carbon fixation and water fluxes in response to increased temperatures and water limitation in regions with Mediterranean climates, with wet winters and dry summers, remain only partially understood. We tested the effect of increased vapor pressure deficit (VPD) and decreased rainfall on water and carbon fluxes of Douglas-fir (Pseudotsuga menziesii) trees using the Soil-Plant-Atmosphere model (SPA). We simulated a 50-year-old Douglas-fir stand on the western slopes of the Cascade Mountains in Oregon, USA. Simulation results showed that increasing the daily maximum VPD by 0.25–2.5 kPa during the summer increased cumulative transpiration by 1–3% and decreased cumulative gross primary production by 3–25%. In contrast, decreasing rainfall by 10–100% during the spring and summer decreased cumulative transpiration by 2–16% and decreased cumulative gross primary production by 0.5–4%. Transpiration was highly sensitive to decreases in rainfall, especially in late spring and early summer but much less sensitive to increases in maximum daily VPD. In contrast, gross primary productivity was much more sensitive to VPD, with summertime increases in VPD having a 5- to 6-fold greater effect on gross primary productivity than did decreasing the rainfall. These results suggested that temperature increases expected from climate change in combination with increases in VPD are likely to reduce forest productivity regardless of soil moisture availability.
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陡峭森林流域中局部和非局部因素对土壤含水量的影响
影响因子：
5.4
作者：
Jarecke, Karla M.;Bladon, Kevin D.;Wondzell, Steven M.
通讯作者：
Wondzell, Steven M.
影响因子：
6.4
作者：
J. McDonnell;C. Gabrielli;A. Thesis;J. McDonnell
通讯作者：
J. McDonnell;C. Gabrielli;A. Thesis;J. McDonnell
影响因子：
4
作者：
M. Williams;B. Law;P. Anthoni;M. Unsworth
通讯作者：
M. Williams;B. Law;P. Anthoni;M. Unsworth
夏季旱季风化基岩渗流区的橡树蒸腾作用
影响因子：
5.4
作者：
Hahm, W. J.;Rempe, D. M.;Dralle, D. N.;Dawson, T. E.;Dietrich, W. E.
通讯作者：
Dietrich, W. E.
随林龄的结构和生理变化：使用基于过程的模型来比较年轻和年老花旗松/西部铁杉林中的碳和水通量
DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
Julian A. Licata
通讯作者：
Julian A. Licata