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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Records of climatic changes in the carbonate profiles of RussianChernozems
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Records of climatic changes in the carbonate profiles of RussianChernozems

机译：俄罗斯Chernozems碳酸盐剖面的气候变化记录

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摘要

The carbonate profiles of Chernozems bear important information on soil processes and can be successfully used for paleoenvironmental reconstruction. In the Northern Caucasus region, Russia, carbonate profiles of Chemozems were compared under anthropogenic (irrigation) and natural changes of moisture regime. The results for irrigation served as the basis for understanding the response to natural climatic changes. A soil chronosequence, consisting of soils buried under archaeological mounds dated to > 5000, 3800-4000 and 1600-1700 BP and modern surface soils, was studied in a similar way. The soils buried > 5000 and 3800-4000 BP had distinctive migrational and segregational carbonate accumulations (CAs). The migrational forms occurred in the surface horizons and contained 89-92% calcite with the highest dissociation temperatures. In the soils buried 1600-1700 BP the carbonate profile was clearly defined in terms of migrational CAs; they occurred only in the deeper horizons, had no clear boundaries and were diffused throughout the soil mass. In the modern surface soils the migrational CAs have almost disappeared, and the segregational CAs have the largest halos of recrystallised carbonates. The values of delta C-13 for CAs in the soils buried > 5000 and 3800-4000 BP were lighter than in the soils buried 1600-1700 BP and the modern surface soils (- 10.6 parts per thousand to -9.9 parts per thousand and - 9.6 parts per thousand to - 8.8 parts per thousand, respectively). We conclude that the climate of the region during the second half of the Holocene changed from relatively dry and warm in the Atlantic period (> 5000 BP) to more humid and cooler in the early Subboreal (5000-4000 BP). Since 4000 BP the climatic conditions have remained relatively stable with some changes in moisture regime resulting from human activities in recent centuries.
机译：黑钙土的碳酸盐剖面具有有关土壤过程的重要信息，可以成功地用于古环境重建。在俄罗斯北高加索地区，比较了人为（灌溉）和水分制度的自然变化下的Chemozems碳酸盐分布。灌溉结果是了解自然气候变化响应的基础。以相似的方式研究了土壤时间序列，该序列由埋藏在> 5000、3800-4000和1600-1700 BP的考古土丘下的土壤和现代表层土壤组成。埋藏> 5000和3800-4000 BP的土壤具有独特的迁移和偏析碳酸盐累积（CA）。迁移形式发生在地表层，含有89-92％的方解石，具有最高的离解温度。在埋藏的1600-1700 BP的土壤中，碳酸盐剖面通过迁移CA得以明确定义。它们只发生在较深的地层，没有明确的边界，并散布在整个土壤中。在现代表层土壤中，迁移CA几乎消失了，而偏析CA具有最大的重结晶碳酸盐晕。埋藏> 5000和3800-4000 BP的土壤中CA的δC-13值比埋藏1600-1700 BP和现代表层土壤中的CA轻（-千分之10.6至-9.9千分，以及-分别为9.6千分之至-8.8千分）。我们得出的结论是，全新世后半期的该区域气候从大西洋时期的相对干燥和温暖（> 5000 BP）转变为Subboreal早期（5000-4000 BP）的更加湿润和凉爽。自从4000 BP以来，由于人类活动导致了最近几个世纪的湿度变化，气候条件一直保持相对稳定。

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