Relationship between Soil Organic Carbon Stocks and Clay Content under Different Climatic Conditions in Central China
Relationship between Soil Organic Carbon Stocks and Clay Content under Different Climatic Conditions in Central China
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DOI：
10.3390/f9100598
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发表时间：
2018-09
期刊：
影响因子：
2.9
通讯作者：
Zekun Zhong;Z. Chen;Yadong Xu;C. Ren;Gaihe Yang;Xinhui Han;Guangxin Ren;Yongzhong Feng
中科院分区：
文献类型：
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作者：
Zekun Zhong;Z. Chen;Yadong Xu;C. Ren;Gaihe Yang;Xinhui Han;Guangxin Ren;Yongzhong Feng
了解不同气候条件下土壤有机碳（SOC）与质地的关系，对于评估未来气候变化对SOC储量的影响具有重要意义。在这项研究中，我们进行了气候梯度实验，涵盖三种气候类型（湿润，亚湿润，半干旱），陡峭的降雨量从345到910毫米，并专门确定SOC动态，粘粒含量，植被和土壤特性。结果表明，从半干旱区到湿润区，0-10 cm和10-20 cm土层土壤有机碳储量、有机碳和粘粒含量同步增加，且相关性较强。在相似的气候条件下，土壤有机碳的动态变化主要受植被和土壤特性的影响，尤其是全氮和全磷的动态变化，而土壤粘粒含量的变化不明显。因此，这些结果表明，SOC储量和粘粒含量之间的关系依赖于尺度大小。在气候类型差异不大的小尺度上，土壤有机碳储量和粘粒含量的变化可能与植被多样性和土壤养分动态有关。这些结果可能有助于未来的模型开发和预测土壤碳储量的变化。
Understanding the association between soil organic carbon (SOC) and texture under different climatic conditions is important for assessing the effects of future climate changes on SOC stocks. In this study, we conducted a climatic gradient experiment covering three climate types (humid, sub-humid, and semi-arid) with a steep rainfall ranging from 345 to 910 mm, and specifically determined SOC dynamics, clay content, and vegetation and soil characteristics. The results showed that, from semi-arid to humid regions, SOC stocks, SOC, and clay content increased synchronously and were closely related in layers of depths of both 0–10 and 10–20 cm. In contrast, under similar climatic conditions, SOC dynamics were mainly affected by vegetation and soil characteristics, especially total nitrogen and total phosphorus dynamics, but not the soil clay content. Therefore, these results suggest that the relationship between SOC stocks and clay content depended on scale sizes. Specifically, on a larger scale with different climatic gradients, the climate may partly determine the changes in SOC and clay dynamics, whereas, at a smaller scale where climate type does not vary considerably, the changes in SOC stocks and clay content may be related to vegetation diversity and soil nutrient dynamics. These results may contribute to future model development and the projection of changes in soil carbon storage.