摘要
以马尾松及广玉兰落叶为试验材料,以浓度均为75 mg/kg的NH_4Cl、KNO_3、NH4NO_3溶液为试验处理液,采用分解袋方法,通过对落叶施加不同形态外源氮的方式模拟氮沉降,研究不同形态外源氮对马尾松及广玉兰落叶分解的影响。结果表明:施加外源氮素可以促进落叶的分解,外源氮对不同树种落叶分解的促进效果不同;广玉兰落叶在外源氮处理后分解率增加更为明显,161天后其各处理分解率均在马尾松落叶分解率的1.2倍以上。氮源形态对马尾松、广玉兰落叶分解率的影响均达极显著(马尾松F=1 262.9 P<0.01,广玉兰F=165.3 P<0.01),其中硝态氮处理效果最好,161天后马尾松和广玉兰落叶的分解率分别为9.79%和13.02%。分解时间对马尾松与广玉兰落叶分解率的影响均达极显著。
The effect of different form exogenous nitrogen addition on decomposition of Pinus massoniana Lamb and Magnolia grandiflora L. leaf litter were studied using a self-designed method of decomposition hag, with the treatments of NH4C1 （ 75 mg/kg ） , KNO3 （ 75 mg/kg ） , NH4NO3 （ 75 mg/kg ） . The main results are as follows： （ 1 ） Exogenous nitrogen accelerated the leaves decomposition rate of both plants while the effect on M. grandiflora L. was stronger. The decomposition rate of M. grandiflora L. was 1.2 times stronger than P. massoniana Lamb in both treatments after 161 days. （ 2 ） Extreme significant effects on both plants with nitrogen sources treatments were showed （ P. massoniana Lamb F=I 262.9 P 〈 0.01 ; M. grandiflora L. F=165.3 P 〈 0.01 ） . The effect of nitrate nitrogen was the best and the decomposition rate of P. massoniana Lamband M. grandiflora L. after 161 days were 9.79% and 13.02% respectively. Extreme significant effects on decomposition rate of P. massoniana Lamb and M. grandiflora L. leaf litter due to time were showed.
作者
周林涛
黄欣
宋曰钦
ZHOU Lintao HUANG Xin SONG Yueqin(Shenzhen Risheng Gardening Co. Ltd., Shenzhen 518000, China Laboratory of Plant Nematology, South China Agricultural University, Guangzhou 510642, China College of Life and Environmental Sciences, Huangshan University, Huangshan 245041, China)
出处
《湖南林业科技》
2017年第2期34-37,共4页
Hunan Forestry Science & Technology
基金
安徽省教育厅自然科学重点项目(KJ2016A680)
关键词
落叶分解
马尾松
广玉兰
外源氮形态
leaves decomposition
Pinus massoniana Lamb
Magnolia grandiflora L.
exogenous nitrogen form
