在永州新田县梘头镇石漠化程度比较严重的两个村子,选定总计20 km 2石灰岩裸露坡地作为试验区域,运用基质覆盖和客土等方式进行土壤改良。试验区种植以棱角山矾为主体,混栽金钱柳,山核桃,黄花槐,白三叶,紫花苜蓿等乔灌木和植被的植物群...在永州新田县梘头镇石漠化程度比较严重的两个村子,选定总计20 km 2石灰岩裸露坡地作为试验区域,运用基质覆盖和客土等方式进行土壤改良。试验区种植以棱角山矾为主体,混栽金钱柳,山核桃,黄花槐,白三叶,紫花苜蓿等乔灌木和植被的植物群落,种植周期为3年。期间,对不同覆盖和客土方式的试验区的主要种植树种的生长状态及对应的土壤理化特性进行检测及分析。结果表明,在永州石漠化地区的生态修复中,通过基质覆盖和客土可以改变土壤的pH值,增加土壤孔隙度,减少土壤容重,提高土壤肥力,促进植物生长,提高生态修复的效率。采用白三叶、紫花苜蓿植被覆盖具有采用基质覆盖的相近效能。利用当地的茅草与环保基质的混合覆盖,能有效地改善土壤容重,增强植物的抗旱水平。展开更多
In order to evaluate the danger of debris flow properly, eight factors were selected as the risk assess- ment indexes of the debris flow, namely the vertical slope, valley relative difference, hillside slope, area of ...In order to evaluate the danger of debris flow properly, eight factors were selected as the risk assess- ment indexes of the debris flow, namely the vertical slope, valley relative difference, hillside slope, area of ba- sin, loose solid material reserves, the path length of sediment supply probability, silting and scouring derrieking and vegetation coverage. The improved Analytic Hierarchy Process （ AHP ） method was used to obtain the weights of the factors; and the efficacy coefficient method was adopted to evaluate the risks of six typical debris flow gullies. According to the research, the improved AHP method not only avoids the subjectivity in the indi- vidual factor valuation by comparing two factors of each layer, but also makes the subsequent consistency check unnecessary.展开更多
文摘在永州新田县梘头镇石漠化程度比较严重的两个村子,选定总计20 km 2石灰岩裸露坡地作为试验区域,运用基质覆盖和客土等方式进行土壤改良。试验区种植以棱角山矾为主体,混栽金钱柳,山核桃,黄花槐,白三叶,紫花苜蓿等乔灌木和植被的植物群落,种植周期为3年。期间,对不同覆盖和客土方式的试验区的主要种植树种的生长状态及对应的土壤理化特性进行检测及分析。结果表明,在永州石漠化地区的生态修复中,通过基质覆盖和客土可以改变土壤的pH值,增加土壤孔隙度,减少土壤容重,提高土壤肥力,促进植物生长,提高生态修复的效率。采用白三叶、紫花苜蓿植被覆盖具有采用基质覆盖的相近效能。利用当地的茅草与环保基质的混合覆盖,能有效地改善土壤容重,增强植物的抗旱水平。
文摘In order to evaluate the danger of debris flow properly, eight factors were selected as the risk assess- ment indexes of the debris flow, namely the vertical slope, valley relative difference, hillside slope, area of ba- sin, loose solid material reserves, the path length of sediment supply probability, silting and scouring derrieking and vegetation coverage. The improved Analytic Hierarchy Process （ AHP ） method was used to obtain the weights of the factors; and the efficacy coefficient method was adopted to evaluate the risks of six typical debris flow gullies. According to the research, the improved AHP method not only avoids the subjectivity in the indi- vidual factor valuation by comparing two factors of each layer, but also makes the subsequent consistency check unnecessary.
