西藏土壤有锌含量及其影响因子分析

Analysis on Soil Available Zinc Content and Its Influencing Factors in Tibet

根据西藏18个供试土类164个剖面有效锌分析资料,探讨了土壤有效锌含量变化及其影响因子。结果表明,西藏土壤表层和表下层有效锌平均含量分别约为3.0、1.0mg/kg。不同类型土壤表层有效锌含依次为:山地湿润森林土(4.88mg/kg)>高山草甸土(3.72mg/kg)>河谷半水成土(2.25mg/kg)>山地旱生林灌土(2.20mg/kg)>寒冻土(1.61mg/kg)>高山草原土(0.82mg/kg)。影响西藏土壤锌有效性的第1主因子为有机质含量,第2主因子为土壤pH值。

The change of soil available zinc content and its influencing factors were studied according to analysis data on available zinc in 164 soil profiles from18 tested soil types in Tibet. The results showed that the average contents of available zinc in surface and subsurface layer soil were about 3.0 and 1.0 mg/kg rcsp.. The content of available zinc in surface soil of different soil types in order was mountain humid forest soils （4.88 mg/kg） 〉 alpine meadows soils （3.72 mg/kg） 〉 valley semi-hydromorphie soils （2.25 mg/kg） 〉 mountain drought forest-coppice soils （2.20 mg/kg） 〉 frigid frozen soils （ 1.61 mg/kg） 〉 alpine steep soils （0.82 mg/kg）. The first principal influencing factor on effectiveness of zinc in Ttheta soils was organic matter content and the second principal influencing factor was pH value.