摘要
土壤质量地球化学调查结果显示,囊谦县城周边农耕区存在较大范围的足量-富硒土地(65.25 km^2),其中足量54.50km^2,富硒10.75km^2,富硒区主要分布在扎曲的西岸,以尕荣达和多果荣两条支沟交汇处、牙不曲北岸前多村以北约1 km处最为富集;硒缺乏-边缘土地占34.75km^2;无硒过剩区。土壤硒的富集除受成土母质硒含量影响外,还受土壤形成的地球化学环境影响;硒更易富集于土壤壤质化程度较高、粒度较细、有机质含量较高的黏土中;干旱气候条件利于可溶态硒富集。通过耦合土壤质量地球化学综合等级,对土壤利用潜力进行评估,将土壤整体足量-富硒或土壤基本特性优良的地区划分为5类功能区,包括富硒特色农业区(5.50km^2)、后备富硒特色农业区(5.25km^2)、普通农业区(27.25km^2)、后备普通农业区(25.00km^2)和保护储备区(37.00km^2),根据当地情况推动富硒特色农业区的发展,对后备富硒特色农业区进行评估,按需修整、补肥。
Results of geochemical evaluation of soil quality showed that there is large area of selenium-rich/sufficient land(65.25 km^2)in cultivated area around Nangqian County.Selenium-rich land covers an area of 10.75 km^2,mainly distributes on the west bank of the Zhaqu River(mainly concentrates in the confluence of Garonda tributary and Duoguorong tributary,and about 1 km to the north of Yabuquqianduo village in north bank of the Yabuqu River).Selenium-sufficient land and selenium-deficiency land account for 54.50 km^2 and 34.75 km^2,respectively.No selenium-excess land was found in the study area.Besides selenium content of parent material,geochemistry environment for soil formation also affects soil selenium enrichment.Selenium is more liable to enrich in soil with higher loamification level,finer particles and higher organic matter content.Arid climate facilitates enrichment of soluble selenium in soil as well.Coupling with integrated geochemical grading of soil quality,soil utilization potential assessment was carried out to divide the areas where the soils basically in excellent conditions and/or selenium-rich/sufficient into five functional areas,including selenium-rich agricultural area(5.50 km^2),reserved selenium-rich agricultural area(5.25 km^2),regular agricultural area(27.25 km^2),reserved regular agricultural area(25.00 km^2)and conservation reserved area(37.00 km^2).Selenium-rich agricultural area should be developed energetically as needed.Assessment on reserved selenium-rich agricultural area should be carried out for modification and/or fertilizer supplement in cultivated land according to demand.
作者
周殷竹
王彪
刘义
王思源
周金龙
ZHOU Yinzhu;WANG Biao;LIU Yi;WANG Siyuan;ZHOU Jinlong(Center for Hydrogeology and Environmental Geology,CGS,Baoding 071051,China;Beijing Institute of Water,Beijing 100048,China;College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2020年第10期93-101,共9页
Journal of Arid Land Resources and Environment
基金
自然资源部中国地质调查局“兰州-西宁经济区综合地质调查”项目(DD20160262)资助。
关键词
土壤质量
富硒土地
农耕区
青海囊谦县
soil quality
selenium-rich land
cultivated area
Nangqian County
Qinghai
