摘要
为探究氮肥添加对高寒草甸地上生物量和土壤养分的影响,施用了 6个梯度的硝酸钙Ca(NO3)2和尿素CO(NH2)2肥料.结果表明:硝酸钙施用量200kg·hm-2时,牧草鲜重、牧草干重、土壤全氮、全磷、铵态氮和硝态氮均最大,分别为569.07kg·hm-2、230.19kg·hm-2、24.31g·kg-1、0.92g·kg-1、0.065g·kg-1和0.950g·kg-1.尿素施用量100kg·hm-2时,牧草鲜重、干重最大,分别为463.18kg·hm-2和201.52kg·hm-2,较对照增加1.09倍和1.23倍;尿素不同施肥梯度对高寒草甸土壤全磷、铵态氮和硝态氮含量影响不显著.
Abstract
The paper explored the effects of six fertilizer gradients of calcium nitrate and urea on alpine meadow above-ground biomass and soil nutrients.The results showed that alpine meadow fresh weight,dry weight,soil total nitrogen,soil total phosphorus,soil ammonium nitrogen,soil nitrate nitrogen were 569.07 kg·hm-2,230.19 kg·hm-2,24.31g·kg-1,0.92 g·kg-1,0.065 g·kg-1 and 0.950 g·kg-1,which were the maximum values when calcium nitrate fertilizer application was200 kg·hm-2.when the application rate of urea was 100 kg·hm-2,fresh weight,dry weight were 463.18 kg·hm-2 and201.52 kg·hm-2,which were higher and significantly increased 1.09 times and 1.23 times and higher than other treatments.alpine meadow soil total phosphorus,soil ammonium nitrogen,soil nitrate nitrogen were not significantly higher under different urea fertilization gradients.
维普
万方数据