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在林地分别喷加0、50、100 和150 kg N hm-2 a-1,研究鼎湖山马尾松林、马尾松针阔混交林和季风常绿阔叶林中土壤20 cm深渗透水酸度和无机氮含量在开始9个月的变化。结果表明,3种森林对照样方土壤渗透水pH值为3.82-4.24,外加氮处理使其平均降低了0.08-0.18。3个森林对照样方土壤渗透水无机氮平均含量分别为6.14、6.66和11.64 mg L-1,铵态氮占15.0%、11.9%和3.0%。外加氮处理使3种森林土壤渗透水铵态氮和硝态氮含量均有不同程度的提高,这表明外加氮处理不但增加了无机氮从森林土壤流失的潜力,而且使土壤进一步酸化。
0, 50, 100 and 150 kg N hm-2 a-1 were sprayed on the woodlands respectively to study the effects of 20 cm deep seepage water acidity and inorganic nitrogen on the Pinus massoniana forest, Pinus massoniana coniferous-broadleaved mixed forest and monsoon evergreen broad-leaved forest Beginning 9 months of change. The results showed that the soil infiltration water pH of the three forest control samples was 3.82-4.24, and the average nitrogen content decreased 0.08-0.18. The average inorganic nitrogen content in infiltration water of three forest control samples was 6.14,6.66 and 11.64 mg L-1, ammonium nitrogen accounted for 15.0%, 11.9% and 3.0%. Nitrogen addition increased the content of NH4 (superscript +) and nitrate (NH3) -N in the three soils, which indicated that addition of nitrogen added not only increased the potential of inorganic nitrogen loss from forest soils but also further acidified the soil.