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利用分形理论计算可知,关中东部TSG全新世剖面的土壤粒度分布具有分形特征,剖面分形维数值在2.5443~2.7123之间,其中古土壤S0的分形维数均值最大。粒度分形维数的高值指示暖湿的气候,低值指示干冷的气候。分形特征所揭示的关中东部地区的环境演变过程为:全新世早期,粒度分形维数值相对偏低,风尘堆积占优势,为干旱寒冷的环境,成壤作用较弱;全新世中期,粒度分形维数值偏大,其平均值为2.6713,指示温暖湿润的气候,成壤作用较强;全新世晚期以来,粒度分形维数值降低,土壤颗粒粒径增大,气候变得相对干旱,成壤作用也减弱,但是全新世晚期的分形维数值高于末次冰期。
According to the fractal theory calculation, the distribution of soil particle size in the TSG Holocene profile in the central part of Guanzhong is fractal. The fractal dimension of the section is between 2.5443 and 2.7123, and the average value of the fractal dimension of the soil S0 is the largest. The high value of the fractal dimension indicates the warm and wet climate and the low value indicates the dry and cold climate. The evolution of the environment in the eastern Guanzhong region revealed by the fractal features is as follows: In the early Holocene, the fractal dimension values were relatively low, and the dust accumulation was dominant, which was arid and cold environment with weak pedogenesis. In the mid-Holocene, the fractal dimension The value is too large, with an average of 2.6713, indicating a warm and humid climate with strong pedogenesis. Since the Late Holocene, the fractal dimension decreased, the particle size of the soil increased, the climate became relatively arid and the pedogenesis Weakened, but the value of fractal dimension in late Holocene was higher than the last glacial period.