• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Agricultural and Forest Meteorology >Net ecosystem productivity of temperate grasslands in northern China: an upscaling study.
【24h】

Net ecosystem productivity of temperate grasslands in northern China: an upscaling study.

机译：中国北方温带草原的净生态系统生产力：一项放大研究。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Grassland is one of the widespread biome types globally, and plays an important role in the terrestrial carbon cycle. We examined net ecosystem production (NEP) for the temperate grasslands in northern China from 2000 to 2010. We combined flux observations, satellite data, and climate data to develop a piecewise regression model for NEP, and then used the model to map NEP for grasslands in northern China. Over the growing season, the northern China's grassland had a net carbon uptake of 158+or-25 g C m-2 during 2000-2010 with the mean regional NEP estimate of 126 Tg C. Our results showed generally higher grassland NEP at high latitudes (northeast) than at low latitudes (central and west) because of different grassland types and environmental conditions. In the northeast, which is dominated by meadow steppes, the growing season NEP generally reached 200-300 g C m-2. In the southwest corner of the region, which is partially occupied by alpine meadow systems, the growing season NEP also reached 200-300 g C m-2. In the central part, which is dominated by typical steppe systems, the growing season NEP generally varied in the range of 100-200 g C m-2. The NEP of the northern China's grasslands was highly variable through years, ranging from 129 (2001) to 217 g C m-2 growing season-1 (2010). The large interannual variations of NEP could be attributed to the sensitivity of temperate grasslands to climate changes and extreme climatic events. The droughts in 2000, 2001, and 2006 reduced the carbon uptake over the growing season by 11%, 29%, and 16% relative to the long-term (2000-2010) mean. Over the study period (2000-2010), precipitation was significantly correlated with NEP for the growing season (R2=0.35, p-value <0.1), indicating that water availability is an important stressor for the productivity of the temperate grasslands in semi-arid and arid regions in northern China. We conclude that northern temperate grasslands have the potential to sequester carbon, but the capacity of carbon sequestration depends on grassland types and environmental conditions. Extreme climate events like drought can significantly reduce the net carbon uptake of grasslands.
机译：草地是全球范围内广泛的生物群落类型之一，在陆地碳循环中起着重要作用。我们研究了2000年至2010年中国北方温带草原的净生态系统生产（NEP）。我们结合通量观测，卫星数据和气候数据建立了NEP的分段回归模型，然后使用该模型绘制了草原的NEP在中国北方。在生长季节中，中国北方草原在2000-2010年期间的净碳吸收量为158+或-25 g C m -2 ，区域平均NEP估计值为126 TgC。我们的结果表明由于不同的草地类型和环境条件，高纬度地区（东北）的草原NEP通常高于低纬度地区（中西部）。在以草原草原为主的东北地区，生长期NEP通常达到200-300 g C m -2 。在该地区的西南角，部分被高寒草甸系统占据，生长期NEP也达到了200-300 g C m -2 。在以典型的草原系统为主的中部地区，生长期的NEP通常在100-200 g C m -2 的范围内变化。中国北方草原的NEP随年份变化很大，范围从129（2001）到217 g C m -2 生长季节 -1 （2010）。 NEP的年际大变化可归因于温带草原对气候变化和极端气候事件的敏感性。与长期（2000-2010年）平均值相比，2000年，2001年和2006年的干旱使生长期的碳吸收减少了11％，29％和16％。在研究期间（2000-2010年），生长季节的降水量与NEP显着相关（R 2 = 0.35，p值<0.1），这表明水分利用是该地区重要的压力源。中国北方半干旱和干旱地区的温带草原生产力我们得出的结论是，北部温带草原具有固碳的潜力，但固碳能力取决于草原类型和环境条件。干旱等极端气候事件会大大减少草原的净碳吸收。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号