摘要
运用广西大化县的DEM、石漠化、地质数据,通过GIS叠加分析,探讨了地质地貌因素对石漠化分布的影响。结果表明:地貌区的石漠化发生率排序为高峰丛洼地区>中峰丛洼地区>峰林谷地区>丘陵山地区。发生石漠化的4种碳酸盐岩中,发生率排序为连续性灰岩>灰岩夹碎屑岩>灰岩与白云岩混合组合>灰岩与碎屑岩互层组合。碳酸盐岩含量较高的3种岩性在25°～45°坡地石漠化发生率最高,含量较低的岩性石漠化发生率高峰在35°～60°,同时发现所有岩性的石漠化发生率在3°～8°坡度区间存在小高峰,这与坡脚普遍的顺坡耕种有关。断层与石漠化关系密切,中度以上石漠化集中分布在断层周围1.5 km内。石漠化的发生是人为干扰、坡面侵蚀、岩石成土与溶蚀作用等综合作用的结果。在石漠化的防治中,应该综合考虑地貌发育、坡度、岩石碳酸盐含量、断层分布等多个因子的影响。
We used GIS technique to overlay the DEM, rock desertification data and geology data of Dahua county of Guangxi Region to explore the influence of geology and landform factors on rock desertification. The results showed ： the occurrence of rock desertification of different landform zones was in order of high cluster-peak depression zone 〉 moderate cluster-peak depression zone 〉 peak-cluster vally zone 〉 Hilly zone ; the occurrence of rock desertification of different lithology was in order of continuous limestone 〉 elastic rock inclusion in limestone 〉 lime- stone and dolomite association 〉 limestone layered with elastic rock. The occurrence of rock desertification of three lithology with higher carbonatite content was the highest in 25° - 45° slope, The occurrence of rock desertification of lithology with lower earbonatite content was the highest in 35° -60° slope. Meanwhile there were all higher value between 3° - 8° slope, it was the result of general longitudinal cultivation at foot-slope. There was a close relationship between rock desertification and fault, moderate and intense rock desertification mainly scattered along the faults within 1.5 km. Rock desertification was comprehensive results of human disturbance, slope erosion, weathering pedogenesis by carbonate rock and karstification. We should considerate the landform class, slope degree, carbonate content of rocks, fault distribution and other factors when we prevent rock desertification and actualize ecologic reconstruction .
出处
《山地学报》
CSCD
北大核心
2009年第3期311-318,共8页
Mountain Research
基金
中国科学院西部行动计划项目(KZCX2-XB2-08)
中国科学院“西部之光”人才培养计划项目资助~~
关键词
石漠化
地质
GIS
坡度
岩性
断层
喀斯特
rock desertification
geology
GIS
slope
lithology
fault
karst
