摘要
以亚热带典型经济树种杉木人工林为对象,分析长期模拟氮沉降下不同土壤层次(0~5 cm,5~20 cm和40~55 cm)土壤大量元素含量(C,N,P,K,Ca,Mg)、微量元素含量(Al,Fe,Mn)变化情况。以尿素为氮源,设置4种处理,分别为N0(0 kg·N·hm^(-2)·a^(-1),对照)、N1(60 kg·N·hm^(-2)·a^(-1))、N2(120 kg·N·hm^(-2)·a^(-1))、N3(240kg·N·hm^(-2)·a^(-1))。恢复处理(NR)为240 kg·N·hm^(-2)·a^(-1)输入2a后停止施肥,让其自然恢复。研究结果表明,杉木人工林土壤养分元素含量大小顺序为Al>Fe>Mn>C>Ca>K>N>P>Mg。随土层的增加,土壤C、N、P平均含量均下降,而Al平均含量均增加。氮沉降降低土壤pH而增加N和Al含量。低氮(N1)促进土壤C含量,中氮(N2)增加土壤Fe含量。恢复处理(NR)可以缓解N3处理的土壤pH和N含量的变化幅度,降低C含量,增加Ca,Mg和Mn含量。通过土壤养分元素含量间的相关性分析表明,土壤C与P,Mg,Al,Fe,Mn显著相关,土壤N与K显著相关,土壤pH与P,Ca显著相关。
In order to study the effects of nitrogen（ N） deposition on soil macroelements and microelements concentration at three soil depth（ 0-5 cm,5-20 cm and 40-55 cm）,a long-term field simulated N additions experiment was conducted at four levels,N0（ control）,N1,N2,N3 with the doses of 0,60,120,and 240 kg·N·hm^（-2）·a^（-1） respectively. A fifth treatment,NR,240 kg·N·hm^（-2）·a^（-1）,was terminated after two years,allowing assessment of recovery during 11 yearing. CO（ NH2）2 was used as the source of N. The results show that soil elemental concentration decreased in the sequence of Al Fe Mn C Ca K N P Mg. With the increasing soil depth,soil C,N,P content decreased,while Al increased. N deposition decreased soil pH while increased soil N and Al contents. N1 promoted soil C,N2 increased soil Fe content. Worth emphasizing was that NR（ 11 years after termination of N3 treatment） can alleviate the change of soil pH and N. NR decreased soil C but increased Ca,Mg,Mn. Pearson correlation coefficient shows that significant correlation was established between soil element contents,soil C with P,Mg,Al,Fe,and Mn,soil N with K,soil pH with P and Ca.
作者
苏兵强
SU Bingqiang(Administration Bureau of National Forest of Fujian Province,Fuzhou 35003,China)
出处
《南昌工程学院学报》
CAS
2018年第3期6-11,共6页
Journal of Nanchang Institute of Technology
基金
江西省教育厅科技项目(GJJ161118)
国家自然科学基金资助项目(31360175)
江西省主要学科学术和技术带头人项目(20162BCB22021)
关键词
长期氮沉降
杉木人工林
大量元素含量
微量元素含量
long-telxn nitrogen deposition
Chinese fir plantation
macroelements concentration
microelements concentration
