Nutrient management in a Pinus radiata plantation after thinning: the effect of nitrogen fertilizer on soil nitrogen fluxes and tree growth
Nutrient management in a Pinus radiata plantation after thinning: the effect of nitrogen fertilizer on soil nitrogen fluxes and tree growth
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间伐后辐射松人工林的养分管理：氮肥对土壤氮通量和树木生长的影响
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Carlyle
中科院分区：
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作者：
J. Carlyle
以11年生疏伐的辐射松为试材，研究了施氮对土壤矿质氮通量、冠层发育和林木生长的影响。唐种植园。在不完全析因设计中施用硫酸铵和过磷酸钙，但仅考虑施氮量为0（对照）或200 kg N·ha-1的主效应。 春季施肥使森林地面和表层土壤（0-0.30 m）中的矿质氮含量从1.2 kg·ha− 1增加到194 kg·ha−1。 在51周内，这一比例下降到8.3千克·公顷-1，89周后又恢复到优选水平。 在未施肥的土壤中，净矿化率低，季节变化不大。氮肥增加了氮的矿化;在2年的测量中，施肥和未施肥的土壤分别矿化了155和77 kg N·ha−1。 肥料氮无净固定。未施肥土壤中的矿质氮没有淋失，而在施肥过程中，149kg N·ha-1的矿质氮淋失到0.30 m以下。
The influence of N fertilizer on soil mineral N fluxes, canopy development, and tree growth was studied in a thinned 11-year-old Pinusradiata D. Don plantation. Ammonium sulphate and single superphosphate were applied in an incomplete factorial design, but only the main effects of N application at 0 (control) or 200 kg N•ha−1 are considered here. Spring application of fertilizer increased the quantity of mineral N in the forest floor plus surface soil (0–0.30 m) from 1.2 to 194 kg•ha−1. Within 51 weeks this had fallen to 8.3 kg•ha−1, and after 89 weeks had returned to prefertilizer levels. In the unfertilized soil, rates of net mineralization were low with little seasonal variation. Nitrogen fertilizer increased N mineralization; over the 2 years of measurement fertilized and unfertilized soils mineralized 155 and 77 kg N•ha−1, respectively. There was no net immobilization of fertilizer N. There was no leaching of mineral N from the unfertilized soil whereas 149 kg N•ha−1 was leached below 0.30 m during t...