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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Satellite-based model detection of recent climate-driven changes in northern high-latitude vegetation productivity
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Satellite-based model detection of recent climate-driven changes in northern high-latitude vegetation productivity

机译：基于卫星的模式检测对北部高纬度植被生产力的最新气候驱动变化

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We applied a satellite remote sensing based production efficiency model (PEM) using an integrated AVHRR and MODIS FPAR/LAI time series with a regionally corrected NCEP/NCAR reanalysis daily surface meteorology and NASA/GEWEX Surface Radiation Budget shortwave solar radiation inputs to assess annual terrestrial net primary productivity (NPP) for the pan-Arctic basin and Alaska from 1983 to 2005. Our results show that low temperature constraints on Boreal-Arctic NPP are decreasing by 0.43% per year (P < 0.001), whereas a positive trend in vegetation moisture constraints of 0.49% per year (P = 0.04) are offsetting the potential benefits of longer growing seasons and contributing to recent disturbances in NPP. The PEM simulations of NPP seasonality, annual anomalies and trends are similar to stand inventory network measurements of boreal aspen stem growth (r = 0.56; P = 0.007) and atmospheric CO2 measurement based estimates of the timing of growing season onset (r = 0.78; P < 0.001). Our results indicate that summer drought led to marked NPP decreases in much of the boreal forest region after the late-1990s. However, seasonal low temperatures are still a dominant limitation on regional NPP. Despite recent drought events, mean annual NPP for the pan-Arctic region showed a positive growth trend of 0.34% per year (20.27 TgC/a; P = 0.002) from 1983 to 2005. Drought induced NPP decreases may become more frequent and widespread as regional ecosystems adjust to a warmer, drier atmosphere, though the occurrence and severity of drought events will depend on future patterns of plant-available moisture.
机译：我们使用了基于卫星遥感的生产效率模型（PEM），该模型使用了集成的AVHRR和MODIS FPAR / LAI时间序列，以及经过区域校正的NCEP / NCAR再分析每日地面气象学和NASA / GEWEX地面辐射预算短波太阳辐射输入，以评估年度陆地1983年至2005年期间，整个北极盆地和阿拉斯加的净初级生产力（NPP）。我们的结果表明，北方北极NPP的低温约束每年下降0.43％（P <0.001），而植被呈正趋势每年0.49％的水分限制（P = 0.04）抵消了较长生长期的潜在好处，并加剧了最近的NPP干扰。 NPP季节性，年度异常和趋势的PEM模拟类似于对北方白杨茎生长的林分库存网络测量（r = 0.56; P = 0.007）和基于大气CO2测量的生长季节开始时间的估算（r = 0.78; P <0.001）。我们的结果表明，1990年代后期以来，夏季干旱导致大部分北方森林地区的NPP显着下降。但是，季节性低温仍然是区域核电厂的主要限制因素。尽管最近发生了干旱事件，但从1983年至2005年，整个北极地区的年均NPP仍显示出0.34％的正增长趋势（20.27 TgC / a; P = 0.002）。干旱引起的NPP下降可能变得更加频繁和广泛。尽管干旱事件的发生和严重程度将取决于植物可用水分的未来模式，但区域生态系统会适应更温暖，更干燥的大气。

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