岷江上游河谷土壤发生的空间分异及环境意义

发布时间：2018-04-02 15:33

本文选题：土壤发生　切入点：空间分异性　出处：《地理科学》2017年02期

【摘要】：分析了岷江上游河谷沿岸及九顶山西北坡表层土壤粒度、氧化铁、有机质、碳酸盐、p H、有机碳同位素、阳离子交换性、粘土矿物等理化性质。结果表明,三江至映秀段土壤具有较高的粘粉比、铁游离度及粘粒和有机质含量,而碳酸盐含量、p H和有机质δ13C值相对偏低,说明土壤发育较好、淋溶作用较强,反映了气候湿润和植被以乔木为主的环境特征;草坡至凤仪段土壤颗粒较粗、碳酸盐含量和p H较高,而铁游度和有机质含量较低,有机质δ13C值偏重,反映出干旱的气候和以C4植被为主的环境特征。九顶山西北坡土壤随海拔的增加粘粉比、有机质含量增大,出现纤铁矿而方解石缺失,反映干旱河谷区高海拔气候湿润;而海拔低于2 000 m的土壤粘粉比和粘粒、有机质含量较低,方解石含量和p H值较高,指示了干旱的气候特征。
[Abstract]:The physical and chemical properties of surface soil such as grain size, iron oxide, organic matter, carbonate pH, organic carbon isotope, cation exchangeability and clay minerals were analyzed along the upper valley of Minjiang River and the northwest slope of Jiudingshan.The results showed that the soil from Sanjiang to Yingxiu had high clay / powder ratio, iron free degree, clay and organic matter content, while carbonate content and 未 ~ (13) C value of organic matter were relatively low, indicating that the soil developed well and had strong leaching effect.The results show that the climate is humid and the vegetation is dominated by Arbor, the soil particles from grass slope to Fengyi are coarse, the carbonate content and pH are higher, but the iron mobility and organic matter content are lower, and the organic matter 未 13C value is more serious.It reflects the arid climate and the environmental characteristics of C4 vegetation.In the northwest slope of Jiudingshan, the content of organic matter increases with the increase of altitude, and the content of pyrite and calcite is absent, which reflects the humid climate in the arid valley area at high altitude, but the ratio of soil to powder and clay in the soil below 2 000 m above sea level.The content of organic matter is low, calcite content and pH value are higher, indicating the climatic characteristics of drought.
【作者单位】：西华师范大学国土资源学院;四川大学环境科学与工程系;
【基金】：国家自然科学基金(41371225,41671220) 四川省教育厅自然科学重点项目(13ZA0115) 西华师范大学创新团队项目(CXTD2016-4)资助~~
【分类号】：S151

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