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在ArcGIS 9.0软件系统平台上,利用1982年172个样点和2002年的117个样点分析成都平原土壤pH值的时空变异特征。结果表明,成都平原样点间表层(0~20 cm)土壤pH值由1982年的6.95±0.90降低到2002年的6.70±0.78,平均降低了3.60%。但从全区来看,平原内仍有占研究区面积53.71%的土壤其pH值增加,仅46.29%的土壤其pH值减少;其中都江堰———彭州一线、邛崃和蒲江的交界处以及成都、龙泉驿和双流的接壤处土壤pH值增加;中部变幅较小;金堂、蒲江等局部地区土壤pH值急剧下降,局部地区下降幅度达1.0个单位。该区土壤pH值变化明显受成土母质、土地利用方式、施肥措施和工业发展的影响。
On the ArcGIS 9.0 software system platform, the spatio-temporal variations of soil pH in Chengdu Plain were analyzed using 172 sampling sites in 1982 and 117 sampling sites in 2002. The results showed that the pH value of surface layer (0 ~ 20 cm) in Chengdu plain decreased from 6.95 ± 0.90 in 1982 to 6.70 ± 0.78 in 2002, with an average reduction of 3.60%. However, from the perspective of the whole region, the soil in the plain still accounts for 53.71% of the total area of the study area, and the pH value of the soil in the study area only increases. Only 46.29% of the soil has its pH value reduced. Among them, Dujiangyan- Pengzhou frontline, the junction of Qionglai and Pujiang, , The pH of the soil at the border between Longquanyi and Shuangliu increased; the amplitude of the middle part was smaller; the pH value of the soil in some areas such as Jintang and Pujiang decreased sharply, and the decrease rate in some areas reached 1.0 unit. The change of soil pH value in this area is obviously influenced by soil parent material, land use patterns, fertilization measures and industrial development.