中文摘要：

研究粗放经营和集约经营条件下毛竹林蔗糖酶、纤维素酶、硝酸还原酶、脲酶和过氧化氢酶5种土壤酶活性对4种氮沉降水平（0、30、60和90kg·hm^-2·a^-1）的响应．结果表明：与粗放经营相比，集约经营分别显著提高土壤蔗糖酶、纤维素酶和脲酶活性55．5％、112．9％和28．6％，显著抑制硝酸还原酶活性31．5％，对过氧化氢酶活性的影响不显著．氮沉降显著抑制粗放和集约经营方式下毛竹林蔗糖酶活性20．0％～49．4％和36．2％～45．1％、纤维素酶活性20．5％～46．3％和18．3％～49．0％、硝酸还原酶活性67．9％-85．2％和15．2％～34．2％，以及集约经营毛竹林脲酶活性23．1％-47．6％，显著增加了粗放经营毛竹林土壤脲酶活性8．1％～50．6％，对过氧化氢酶活性的影响不显著．氮沉降与经营方式的复合作用除对过氧化氢酶活性的影响不显著外，对其他4种土壤酶活性的影响均达到显著水平．

英文摘要：

In this study, a field experiment was conducted using simulated N deposition method in conventionally managed （CM） and intensively managed （IM） Moso bamboo forests to test the responses of five soil enzymes （including β-fructofuranosidase, cellulase, nitrate reductase, hydrogen peroxidase and urease） to simulated N deposition of four treatment levels of 0, 30, 60 and 90 kg N·hm^-2·a^-1. The results showed that compared with CM, IM significantly increased soil β-fructofuranosidase, cellulase, urease activities by 55.5%, 112.9% and 28.6%, respectively, but significantly decreased nitrate reductase activity by 31.5%, and had no significant effect on hydro- gen peroxidase activity. Nitrogen deposition significantly decreased soil β-fructofuranosidase （20.0%- 49.4% and 36.2%-45.1%） , cellulase （20.5%-46.3% and 18.3%-49.0%）, nitrate reductase （67.9%-85.2% and 15.2%-34.2%） activities in both CM and IM plots, respectively, and also urease activity （23.1%-47.6%） in IM, but enhanced the urease activity （8.1%-50.6%） in CM, and had no significant effects on hydrogen peroxidase activity. The combination of N deposition and management types significantly impacted the four soil enzyme activities except for hydrogen peroxi- dase.