外加氮源对杉木(Cunninghamia lanceolata)幼苗土壤养分的影响

Effects of Nitrogen Addition on soil nutrients beneath Chinese fir seedling

通过室内模拟试验,研究了外加氮源对杉林幼苗土壤养分的影响。试验设计为5种处理,分别为N0(0 g.(m2.a)-1,对照)、N1(6 g.(m2.a)-1)、N2(12 g.(m2.a)-1)、N3(24 g.(m2.a)-1)和N4(48 g.(m2.a)-1.结果表明,土壤有机碳和全氮含量随外加氮源量的增加而增加,相对于N0处理,N1、N2、N3和N4处理土壤有机碳含量分别增加了5.19%、8.06%、11.18%、12.86%,土壤全氮含量分别增加了3.71%、8.71%、12.53%、22.02%;土壤全磷、全钾、全钙和全镁随外加氮源量的增加而降低.

A greenhouse simulated experiment was conducted in Nanchang Institute of Technology to study the effects of simulated nitrogen addition on soil acidification and soil base cations.The treatments were designed as N0（control）,N1,N2,N3 and N4 at the doses of 0,6,12,24and 48 g·（m2·a）-1,respectively.The results show that soil organic carbon and total nitrogen increased with the increase of nitrogen addition.Soil organic carbon for N1,N2,N3 and N4 was increased by 5.19%、8.06%、11.18%、12.86% respectively than that of N0,and soil total nitrogen was increased by 3.71%、8.71%、12.53%、22.02% respectively.The content of total phosphorus,total potassium,total calcium and total magnesium decreased with the increase of nitrogen addition.