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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Interannual variability of photosynthesis across Africa and its attribution
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Interannual variability of photosynthesis across Africa and its attribution

机译：非洲光合作用的年际变化及其归因

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Africa is thought to be a large source of interannual variability in the global carbon cycle, only vaguely attributed to climate fluctuations. This study uses a biophysical model, Simple Biosphere, to examine in detail what specific factors, physiological (acute stress from low soil water, temperature, or low humidity) and biophysical (low vegetation radiation use), are responsible for spatiotemporal patterns of photosynthesis across the African continent during the period 1982-2003. Acute soil water stress emerges as the primary factor driving interannual variability of photosynthesis for most of Africa. Southern savannas and woodlands are a particular hot spot of interannual variability in photosynthesis, owing to high rainfall variability and photosynthetic potential but intermediate annual rainfall. Surprisingly low interannual variability of photosynthesis in much of the Sudano-Sahelian zone derives from relatively low vegetation cover, pronounced humidity stress, and somewhat lower rainfall variability, whereas perennially wet conditions diminish interannual variability in photosynthesis across much of the Congo Basin and coastal West Africa. Though not of focus here, the coefficient of variation in photosynthesis is notably high in drylands and desert margins (i.e., Sahel, Greater Horn, Namib, and Kalahari) having implications for supply of food and fiber. These findings emphasize that when considering impacts of climate change and land surface feedbacks to the atmosphere, it is important to recognize how vegetation, climate, and soil characteristics may conspire to filter or dampen ecosystem responses to hydroclimatic variability.
机译：人们认为非洲是全球碳循环中年际变化的主要来源，只是模糊地归因于气候波动。这项研究使用生物物理模型“简单生物圈”来详细研究哪些特殊因素（生理因素（低土壤水，温度或低湿度引起的急性胁迫）和生物物理因素（低植被辐射的使用）是造成整个植物光合作用的时空模式的原因。 1982-2003年期间的非洲大陆。急性土壤水分胁迫已成为驱动非洲大部分地区光合作用年际变化的主要因素。稀树草原南部和林地是光合作用年际变化的一个特别热点，这是由于降雨的多变性和光合潜力大，但年降雨量中等。令人惊讶的是，苏达诺-萨赫勒地区大部分地区的光合作用年际变化低，是由于植被覆盖率较低，明显的湿度胁迫以及降雨的变化性较低，而多年潮湿的条件减少了刚果盆地和西非沿海地区光合作用的年际变化。 。虽然这里没有重点介绍，但在干旱地区和沙漠边缘（即萨赫勒，大霍恩，纳米布和卡拉哈里），光合作用的变化系数特别高，这对食物和纤维的供应产生了影响。这些发现强调，在考虑气候变化和陆地表面对大气的反馈的影响时，重要的是认识到植被，气候和土壤特征如何合谋过滤或抑制生态系统对水文气候变化的响应。

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