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首页> 外文期刊>Chinese science bulletin >Different climatic controls of soil δ~(13)C_(org) in three mid-latitude regions of the Northern Hemisphere since the Last Glacial period
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Different climatic controls of soil δ~(13)C_(org) in three mid-latitude regions of the Northern Hemisphere since the Last Glacial period

机译：末次冰期以来北半球三个中纬度地区土壤δ〜（13）C_（org）的不同气候控制

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摘要

Paleoecological records of soil δ~(13)C_(org) from three regions in the middle latitudes of the Northern Hemisphere, including the Chinese Loess Plateau (CLP), the Great Plains and adjacent areas of North America and northwestern Europe, showed different variations since the Last Glacial period. An attempt was made to evaluate the causes for the difference in δ~(13)C_(org) on the basis of the modern climatic data collected in these regions and of the modern C_3 and C_4 plant distributions. The analysis indicates that temperature, especially the growing season temperature, has a dominant control on the growth of C_4 plants. When the mean annual or growing season temperatures are below the "threshold value", the growth of C_4 plants is limited. When the temperature is above the "threshold value", C_4 plants can grow under a wide range of precipitation. However, when the precipitation is high enough to favor the growth of trees, the proportions of C_4 plants in local biomass will decline. The implicit control factor recovered by sedimentary records is consistent with the control factor on modern C_3/C_4 distribution. Pure C_3 plants have been dominating the local biomass since the Last Glacial period in European loess region, mainly owing to the low local temperature. The increases in C_4 plants from the late Pleistocene to the Holocene in the Chinese Loess Plateau, the Great Plains and adjacent areas, mainly reflect the influence of increasing temperature.
机译：北半球中纬度三个地区的土壤δ〜（13）C_（org）的古生态记录，包括中国黄土高原（CLP），大平原以及北美和西北欧的邻近地区，表现出不同的变化。自上次冰河时期以来。尝试根据在这些地区收集的现代气候数据以及现代C_3和C_4植物分布来评估δ〜（13）C_（org）差异的原因。分析表明，温度，尤其是生长期温度，对C_4植物的生长起主要控制作用。当年平均或生长季节的平均温度低于“阈值”时，​​C_4植物的生长受到限制。当温度高于“阈值”时，​​C_4植物可以在很大的降水范围内生长。但是，当降水量足够高以利于树木生长时，C_4植物在当地生物量中的比例将下降。沉积记录得到的隐含控制因子与现代C_3 / C_4分布的控制因子一致。自欧洲黄土最后一次冰期以来，纯C_3植物一直主导着当地生物量，这主要是由于当地温度较低。黄土高原，大平原及邻近地区从晚更新世到全新世C_4植物的增加，主要反映了温度升高的影响。

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