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首页> 外文学位 >Effects of ozone pollution and climate variability/change on spatial and temporal patterns of terrestrial primary productivity and carbon storage in China.
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Effects of ozone pollution and climate variability/change on spatial and temporal patterns of terrestrial primary productivity and carbon storage in China.

机译：臭氧污染和气候变化/变化对中国陆地初级生产力和碳储量的时空格局的影响。

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摘要

Over the past several decades, China's terrestrial ecosystems have experienced severe air pollution and other environmental changes. Quantifying how these environmental changes have affected carbon (C) fluxes and storage in China's terrestrial ecosystems is crucial to understanding the global C cycle as well as China's sustainability. Using an improved Dynamic Land Ecosystem Model (DLEM), I assessed the spatial and temporal patterns of net primary productivity (NPP) and C storage in China's terrestrial ecosystems in response to tropospheric ozone (O3) pollution and historical climate variability/change in the context of multi-factor global change during 1961-2005. An overall evaluation has been implemented to investigate how elevated O3 in combination with climate variability has affected the C cycle in terrestrial ecosystems of the nation. The modeled results showed that during 1961-2005, elevated O3 resulted in a mean 4.5% loss in NPP and a 0.9% reduction in total C storage for China's terrestrial ecosystems as a whole, which has reduced the magnitude of terrestrial C sink during the same period. The reduction of C storage among different terrestrial ecosystems varied from 0.1 Tg C to 312 Tg C (1 T = 1012 ) with a decreasing rate ranging from 0.2% to 6.9%. For example, China's grassland ecosystems, distributed mainly in arid and semi-arid regions of North China, were the most vulnerable in response to climate variability/change and elevated O3. The effect of O3 pollution on China's forest ecosystems could be accelerated by climate extreme events such as drought. For agricultural ecosystems, some rain-fed cropland areas in arid and semi-arid regions of North China, which experienced high O3 levels and frequent drought events, acted as a C source. However the effect of O3 pollution and climate variability/change on C storage in cropland could be modified by land management (e.g. irrigation and fertilizer). Results from this study indicate that improved air quality could significantly increase productivity and C storage in China's terrestrial ecosystems and that optimized land management options could enhance the adaptation of terrestrial ecosystem to climate variability/change and air pollution.
机译：在过去的几十年中，中国陆地生态系统经历了严重的空气污染和其他环境变化。量化这些环境变化如何影响中国陆地生态系统中的碳通量和储存量，对于理解全球碳循环以及中国的可持续性至关重要。通过使用改进的动态土地生态系统模型（DLEM），我评估了对流层臭氧（O3）污染和历史气候变率/变化对中国陆地生态系统净初级生产力（NPP）和碳存储的时空格局1961-2005年全球多因素变化的影响。已经进行了总体评估，以调查升高的O3结合气候变异性如何影响了该国陆地生态系统的碳循环。模拟结果表明，在1961-2005年间，升高的O3导致中国整个陆地生态系统的NPP平均损失4.5％，总C储量减少0.9％，这在同一时间降低了陆地C汇的数量。期。不同陆地生态系统之间的C储量减少量从0.1 Tg C到312 Tg C（1 T = 1012）不等，下降率从0.2％到6.9％。例如，中国的草地生态系统主要分布在华北的干旱和半干旱地区，是应对气候变化/变化和O3升高的最脆弱的地区。干旱等气候极端事件可能会加速O3污染对中国森林生态系统的影响。对于农业生态系统而言，华北干旱和半干旱地区的一些雨养农田地区是碳源，这些地区经历了高O3含量和频繁的干旱事件。但是，可以通过土地管理（例如灌溉和化肥）来改变O3污染和气候变化/变化对农田C储存的影响。这项研究的结果表明，改善空气质量可以显着提高中国陆地生态系统的生产力和碳储量，优化的土地管理选择可以增强陆地生态系统对气候变化/变化和空气污染的适应能力。

著录项

  • 作者

    Ren, Wei.;

  • 作者单位

    Auburn University.;

  • 授予单位 Auburn University.;
  • 学科 Biology Ecology.;Biogeochemistry.;Climate Change.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 220 p.
  • 总页数 220
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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