不同施肥处理对雷竹林土壤氮、磷渗漏流失的影响

为了解雷竹不同施肥水平对林地土壤氮、磷渗漏流失的影响，设置了4个施肥水平的定位试验，即不施肥、减量施肥(比常规施肥减量50%)、常规施肥(施肥量：尿素1 125.0 kg/hm2、复合肥2 250.0 kg/hm2)和增量施肥(比常规施肥增量50%)，于2007年5至10月采集并分析渗漏水样。结果表明：雷竹林土壤渗漏水量的多少与降雨量的大小呈明显的线性关系(p<0.01)。随着施肥量的增加，雷竹林地土壤渗漏水中各形态氮、总磷含量明显提高，渗漏流失负荷也明显增多。5至9月渗漏水中各养分浓度逐渐下降，10月份则明显升高，这与渗漏流失量密切相关。减量、常规和超量施肥处理下，氮素淋失量分别占施肥量的4.22%、4.25%和4.54%，磷素淋失量分别占施肥量的1.07%、0.65%和0.56%。

Study on nitrogen and phosphorus leaching at different fertilizer levels in Phyllostachys praecox stands

To reveal characteristics of nutrients in leaching water at four different fertilizer levels,controlling with no fertilizer,half of the normal rate,normal rate with 1 125.0 kg/hm2 of urea and 2 250.0 kg/hm2 of compounded fertilizer,and one and half of the normal rate,a field experiment was conducted in Phyllostachys praecox stands.Leaching water was collected and analyzed from May to October in 2007.Results showed that there was a significant linear relationship between the amount of leaching water and the ...