森林与环境学报2017，Vol.37Issue(2)：174-180,7.DOI:10.13324/j.cnki.jfcf.2017.02.008
氮沉降对凋落叶分解前期土壤酶活性的影响
Effects of simulated nitrogen deposition on soil enzyme activity during early stage of leaf fitter decomposition
摘要
Abstract
In order to understand the response of soil enzyme to nitrogen deposition,four treatments,namely bare soil (BS),Pinus massoniana litter (PL),Cunninghamia lanceolata litter (CL) and Schima superba litter (SL) were set in simulated natural nitrogen deposition (30 kg N·hm-2·a-1),respectively in this study.The dynamic changes of litter decomposition of different plant (P.massoniana,C.lanceolata and S.superba) and activities of asparaginase and cellulase were analyzed during early stage of leaf litter decomposition with the constant temperature and soil water content.The results showed that the decomposition rate of C.lanceolata leaf litter was the highest,with the S.superba leaf litter in the medium and the lowest for P.massoniana leaf litter at the end of experiment.With the exogenous nitrogen accumulation and the leaf litter decomposition,total nitrogen content of leaf litter increased while C ∶ N ratio of leaf litter decreased.The value of soil pH decreased significantly.And The nitrogen availability increased distinctly by adding ammonium nitrate.The activity of cellulase was promoted by exogenous nitrogen input,but soil asparaginase activity was inhibited,inversely.Cellulase activity in soil was inhibited by the leaf litter decomposition at the early stage,but promoted at the medium and last of litter decomposition process.However,the effect of leaf litter decomposition on asparaginase activity have no significant regularity.Therefore,nitrogen cycle will change the soil C ∶ N ratio in forest,thus affect material circulation and energy flow of the forest ecosystem.关键词
氮沉降/凋落物分解/纤维素酶/天冬酰胺酶/土壤Key words
nitrogen deposition/litter decomposition/cellulose/asparaginase/soil分类
农业科技引用本文复制引用
吴旺旺,张丽丽,林达,黄幸然,胡宝叶,易志刚..氮沉降对凋落叶分解前期土壤酶活性的影响[J].森林与环境学报,2017,37(2):174-180,7.基金项目
国家自然科学基金项目(41473083). （41473083）
