Distribution and main input pathways of Se in forest soil in the Tianlaochi catchment of the Qilian Mountains
To clarify the distribution of Se in forest soil and its main input pathways,the study focused on the Tianlaochi catchment of the Sidalong Nature Conservation Station in the central part of the Qilian Mountains,with our research object being the soil of the Qilian juniper forest(QJF).The content of Se was analyzed in each soil horizon,as well as the contribution of atmospheric deposition and litter to soil Se.And the residence time and accumulation increment of Se in forest soils were predicted.The results showed that the Se content in the soil was increased in the order:litter horizon＜humus horizon＜mineral horizon.Se content in each soil layer of QJF showed a decreasing trend with increasing elevation,al-though this trend was not statistically significant.The annual flux of Se in atmospheric deposition inside the forest(823.80 μg/m2)was higher than that outside(549.77 μg/m2);the annual flux of Se in the needle litter of QJF was 269.76 μg/m2.The mean residence time of Se in the organic horizon soil of QJF was 89 a.The content of Se in the surface soil inside and outside QJF would rapidly increase in the next 30 a,and the increase rate would slow down thereafter.
万方数据
维普
