氮沉降对木荷马尾松混交林土壤有效磷的影响

Impacts of Nitrogen Deposition on Soil Available Phosphorus in Schima superba and Pinus massoniana Mixed Forest

采用野外试验和室内测量法,研究了氮沉降处理对木荷马尾松混交林土壤有效磷的影响。结果表明,相同氮沉降处理后,土壤有效磷质量分数随土壤深度的加深而降低;不同氮沉降量对相同土壤层有效磷质量分数的影响呈现先抑制后促进的趋势。9个月的高氮处理(150 kg.hm-2.a-1)最有利于土壤有效磷的吸收。

An experiment was conducted to study the impacts of nitrogen deposition on soil available phosphorus in a Schima superba and Pinus massoniana mixed forest in Fuzhou National Forest Park of Fuzhou City by field test and laboratory measurement. Results showed that, for the same nitrogen deposition treatment, the content of available phosphorus decreased with the increase of soil depth; while for different nitrogen deposition treatments, the content of available phosphorus in the same soil layer was first restrained by the nitrogen deposition and then turned to increase. The treatment of high contents of nitrogen （ 150 kg · hm^-2 · a^-1 ） simulated nine months was proved to be helpful to the absorption of soil available phosphorus.