Item talk:Q236215

From geokb

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   "abstract": "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 \u00b1 25 g C m\u22122 during 2000\u20132010 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\u2013300 g C m\u22122. In the southwest corner of the region, which is partially occupied by alpine meadow systems, the growing season NEP also reached 200\u2013300 g C m\u22122. In the central part, which is dominated by typical steppe systems, the growing season NEP generally varied in the range of 100\u2013200 g C m\u22122. The NEP of the northern China's grasslands was highly variable through years, ranging from 129 (2001) to 217 g C m\u22122 growing season\u22121 (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\u20132010) mean. Over the study period (2000\u20132010), 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.",
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