[目的]水土保持是保护和改善生态环境的重要途径,是生态系统可持续发展的重要基础,而区域尺度水土保持成效研究可为水土保护工作提供有效的理论依据。[方法]基于遥感技术,采用修正的通用土壤流失方程(revised universal soil loss equat...[目的]水土保持是保护和改善生态环境的重要途径,是生态系统可持续发展的重要基础,而区域尺度水土保持成效研究可为水土保护工作提供有效的理论依据。[方法]基于遥感技术,采用修正的通用土壤流失方程(revised universal soil loss equation,RUSLE)构建区域尺度水土保持率遥感估算方法体系,并估算山西省土壤侵蚀空间格局。[结果]山西省水土流失等级以中度侵蚀为主,水土流失面积约49545.68 km^(2),2022年水土保持率为68.38%,水土保持率高的等级面积占比最大。自然植被水土保持率高于农田,其中,森林水土保持率最高,为84.37%,且在自然植被与农田类型中,水土保持率高的等级面积占比最大,分别为48.11%,46.46%。水土保持率受坡度影响较大,且随坡度的变化呈现先显著减少后平缓波动的趋势。通过与已有研究成果对比,估算得到的山西省水土流失空间格局及规律与现有水土流失数据基本一致,且水土保持率估算结果与公布的水土保持率目标值呈显著强相关。[结论]综上所述,区域尺度水土保持率遥感估算方法可为水土保持生态工程及其他国家重大生态工程的成效和效益评估提供重要的理论和方法依据。展开更多
The scalloped medium-length hole blasting mining method used in Dahongshan Copper Mine accounted for more than 61%of the total amount of mining,but the large boulder yield restricted the intensity of ore supply for mi...The scalloped medium-length hole blasting mining method used in Dahongshan Copper Mine accounted for more than 61%of the total amount of mining,but the large boulder yield restricted the intensity of ore supply for mines,and the average boulder yield was as high as 22.7%.In order to develop the mine production efficiency,the circular medium-length hole blasting technology was proposed and field tests were carried out.The test results showed that circular medium-length hole blasting mining can reduce the average boulder yield to 10.3%.Compared with the traditional scalloped medium-length hole blasting mining,the average boulder yield was decreased by 12.4%.The daily yield of ore for the panel on duty was increased by 152.29 t,and the growth rate was 51.1%.The new technology can reduce the time for the handling of boulder and the consumption of explosives and detonators for recrushing,and increase the efficiency of mining while reduce the mining cost,which has received good blasting effects.展开更多
基金National Natural Science Foundation of China （No. 51304087） Foundation Projects of Yun- nan Province （No. KKSY201404056, No. KKSA201121083）
文摘The scalloped medium-length hole blasting mining method used in Dahongshan Copper Mine accounted for more than 61%of the total amount of mining,but the large boulder yield restricted the intensity of ore supply for mines,and the average boulder yield was as high as 22.7%.In order to develop the mine production efficiency,the circular medium-length hole blasting technology was proposed and field tests were carried out.The test results showed that circular medium-length hole blasting mining can reduce the average boulder yield to 10.3%.Compared with the traditional scalloped medium-length hole blasting mining,the average boulder yield was decreased by 12.4%.The daily yield of ore for the panel on duty was increased by 152.29 t,and the growth rate was 51.1%.The new technology can reduce the time for the handling of boulder and the consumption of explosives and detonators for recrushing,and increase the efficiency of mining while reduce the mining cost,which has received good blasting effects.
