Changes of carbon stocks in alpine grassland soils from 2002 to 2011 on the Tibetan Plateau and their climatic causes
Changes of carbon stocks in alpine grassland soils from 2002 to 2011 on the Tibetan Plateau and their climatic causes
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DOI：
10.1016/j.geoderma.2016.11.016
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发表时间：
2017-02
期刊：
影响因子：
6.1
通讯作者：
Litong Chen;Xin Jing;D. Flynn;Yue Shi;P. Kühn;T. Scholten;Jinsheng He
中科院分区：
文献类型：
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作者：
Litong Chen;Xin Jing;D. Flynn;Yue Shi;P. Kühn;T. Scholten;Jinsheng He
南方草原是中国草原生态系统的重要组成部分，在中国陆地碳循环中发挥着重要作用。利用陆地生态系统模型（Terrestrial Ecosystem Model）模拟了1961 - 2013年南方草地碳收支的时空动态，结果表明，研究期间南方草地年碳收支变化范围为-8.12 ~6.16 Tg C y− 1，年均值为0.45 Tg C y− 1。总体而言，南部草原作为一个弱的碳汇和固碳23.83 Tg C从1961年到2013年。在季节尺度上，南方草地在丰水期充当碳汇，而在枯水期充当碳源。在研究期间，温度和降水是季节尺度上碳收支动态的主要驱动因子，而土壤水分是年尺度上的主要驱动因子。在整个研究区，有71.81%的面积转化为碳汇，只有5.90%的面积保持稳定，强碳汇主要分布在南部草原的南部、北方和西部。
The southern grasslands are an integral part of the grassland ecosystems of China and play an essential role in the terrestrial carbon cycle of the country. We reproduced the spatiotemporal dynamics of the carbon budget of southern grasslands from 1961 to 2013 using the Terrestrial Ecosystem Model and our results showed that the annual carbon budget varied from −8.12 to 6.16 Tg C y−1with an annual average of 0.45 Tg C y−1during the study period. Overall, southern grasslands acted as a weak carbon sink and sequestrated 23.83 Tg C from 1961 to 2013. At the seasonal scale, southern grasslands acted as a carbon sink in wet seasons but as a carbon source in dry seasons. During the study period, temperature and precipitation were the main factors driving carbon budget dynamics at the seasonal scale, while soil moisture was the main driving factor at the annual scale. Over the entire study region, 71.81% of the area switched to being a carbon sink while only 5.90% remained stable and the strong carbon sinks were mainly found in the southern, northern and western areas of the southern grasslands.