模拟大气氮沉降对云南松飞播林土壤有机碳的影响

于2020年1月至2021年7月,对凉山州云南松飞播林进行了不同水平氮沉降处理,试验研究了凉山州云南松林飞播林土壤有机碳对模拟N沉降的响应.共设置LN(低氮,50 kg/(hm2·a))、MN(中氮,100 kg/(hm2·a))、HN(高氮,150 kg/(hm2·a))和CK4个处理.结果显示:①氮水平增加土壤有机...

Effects of Nitrogen Deposition on Soil Organic Carbon in a Pinus yunnanensis Aerial Forest Plantation

On January 2020~July 2021,the response of soil organic carbon to simulated N deposition of Pinus yunnanensis aerial seeding forest in Liangshan Prefecture was studied.Experimental treatments were set 4 CK,LN(low nitrogen,50kg/(hm²?a)),MN(nitrogen,100kg/(hm²?a))and HN(nitrogen,150kg/(hm²?a)).The results show that:①the nitrogen deposition increased the soil organic carbon(P<0.05),and MN had the strongest promotion effect;②under the treatment of each nitrogen level,the soil organic carbon showed obvious seasonal dynamics,which appeared as the largest in spring and the lowest in winter;③under different nitrogen deposition,the soil organic carbon content of LN changes over time as 450d(in April of the following year)>540d(in July of the following year)>180d(in October)>360d(in January of the following year)>270d(July).MN performance is 450d>540d>270d>180d>360d;HN performance is 450d>360d>540d>270d>180d.The results of the study indicate that the soil organic carbon content increases first and then decreases with the continuous input of nitrogen content.