文峪河上游河岸林土壤氮素截留潜力及其影响因素

Soil Nitrogen Retention Potential and Influencing Factors of Riparian Forest in Upstream Wenyu River

以关帝山文峪河上游3种典型河岸林为研究对象,分5个梯度进行外源氮磷输入试验,通过定期土壤取样、试验室化验分析,对不同河岸林外源氮磷加载后土壤氮截留潜力进行分析,结果表明:灌木林对氮的截留量最高;全氮截留量:灌木林>阔叶林>针叶林,铵态氮的截留量:阔叶林>灌木林>针叶林;硝态氮的截留量:灌木林>针叶林>阔叶林,铵态氮的截留量显著大于硝态氮。不同河岸林土壤对氮素的截留率有差异,针叶林的氮素截留率最高,灌木林最低。土壤铵态氮和硝态氮滞留率都与全氮滞留率、外源氮输入量呈极显著正相关;土壤全氮、硝态氮滞留率与土壤含水量呈极显著负相关,土壤全氮、铵态氮、硝态氮的截留率与土壤pH相关性不显著。

Taking three types riparian forest of upstream watershed in WenYu river as study object, the test for Nitrogen and Phosphorus Inputs in five fertilizer gradients, through regularly collecting, testing and analyzing for the soil in lab, it studied and comparatively analysed the retention potential of soil for Nitrogen and Phosphorus in different riparian forest. The results were： Nitrogen retention of Shrub forest was the highest; Total Nitrogen（TN） retention：Shrub forest〉Broad-leaved forest〉Coniferous forest; Ammonium Nitrogen（AN）retention：Broad-leaved forest〉Shrub forest,〉Coniferous forest; Nitrate Nitrogen（NN） retention： Shrub forest〉Coniferous forest〉Broad-leaved forest ; The AN retention rate was significantly higher than the NN retention amount. The retention rate of different riparian forest was different. The retention rate of Coniferous riparian forest was the highest. The retention rate of Shrub riparian forest was the minimum. There were very significantly positive correlated with the retention rate of AN and TN, with NN and TN,with the retention rate of AN and rate of N inputs,and with the retention rate of NN and of N inputs. There was highly significant negative correlation with the retention rate of TN, NN and Soil Moisture. There was no significant correlation with the retention rate of TN,AN,NN and pH.