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运用137Cs示踪技术,查明了蒙古高原西北-东南向的塔里亚特-锡林郭勒样带区域7个典型景观类型采样点风蚀速率及变化特征,分析了不同区域土壤风蚀速率的主要影响因素.研究表明:各采样点137Cs面积活度介于(265.63±44.91)~(1279.54±166.53)Bq·m-2,差异明显,相应的风蚀速率分别为64.58~419.63t·km-2·a-1.样带上蒙古国境内部分,人类活动较轻微,由北向南,随主要的植被景观和气候指标变化,相应的土壤风蚀速率基本呈逐渐加大趋势,表明该区域土壤风蚀过程主要受自然因素的影响和调节;样带上内蒙古锡林浩特和正镶白旗2个典型草原样点风蚀速率为蒙古国巴彦淖尔典型草原样点风蚀速率的近3倍,除导致风蚀加剧的自然条件差异之外,通过比较两地人口密度和载畜量水平,表明人类扰动是导致内蒙古典型草原样点风蚀加剧的主要因素之一.
Using 137Cs tracer technique, the wind erosion rate and its variation characteristics of seven typical landscape types in the northwestern-southeastern Tarim-Xilin Gol zone of the Mongolian Plateau were determined, and the main influencing factors of wind erosion rates in different regions were analyzed. The results showed that the area activities of 137Cs at each sampling point ranged from (265.63 ± 44.91) to (1279.54 ± 166.53) Bq · m-2, with significant differences, with corresponding wind erosion rates of 64.58-419.63 t · km-2 · a-1 In the part of Mongolia, the human activities are slight, from north to south. With the change of main vegetation landscapes and climate indicators, the corresponding soil erosion rate gradually increases, indicating that the wind erosion process in this area is mainly affected by natural factors The wind erosion rates of two typical steppe samples from Xilinhot and Zhengpungbaiqi in Inner Mongolia were nearly three times that of Bayannur typical grassland sample in Mongolia. In addition to the natural differences in wind erosion, Comparing the population density and stocking levels of the two places shows that human disturbance is one of the main factors leading to the wind erosion in typical grassland samples in Inner Mongolia.