三峡库区汝溪河流域柏木林土壤氮素及酶活性特征  

Characteristics of Soil Nitrogen Content and Enzymatic Activities in Cupressus funebris Plantations along Ruxi River Watershed in the Three Gorges Reservoir Area

作　　者：冯大兰[1] 黄小辉[1,2] 张丽楠[1] 黄仲华[1] 李昌晓[3] 耿养会[1] 曾静[1] 

机构地区：[1]重庆市林业科学研究院三峡库区森林生态保护与恢复重庆市市级重点实验室,重庆400036 [2]西南大学资源环境学院,重庆400715 [3]西南大学生命科学学院三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《林业科学》2013年第12期25-29,共5页Scientia Silvae Sinicae

基　　金：国家林业公益性行业科研专项(201004039);三峡库区森林生态保护与恢复重庆市市级重点实验室开放基金项目

摘　　要：以三峡库区汝溪河流域柏木纯林和柏木＋青冈混交林为研究对象,研究不同林分类型柏木林土壤氮素、酶活性特征及其相互关系.结果表明：柏木纯林和柏木＋青冈混交林各土层（0～20,20～40和40 ～ 60 cm）铵态氮含量无显著差异;柏木＋青冈混交林各土层全氮含量显著高于柏木纯林,分别提高了61.1％,55.7％和19.8％;与柏木纯林相比,柏木＋青冈混交林林地各土层的硝态氮含量提高了10.3％,10.5％和25.5％;各土层柏木＋青冈混交林土壤微生物生物量氮含量分别是柏木纯林的1.2,1.0和1.6倍;柏木＋青冈混交林林地各土层蛋白酶、过氧化氢酶、脲酶和转化酶活性总体上均显著高于柏木纯林.与柏木纯林相比,柏木＋青冈混交林具有明显优势,可以明显改善林地内土壤氮素状况和酶活性,改善林地生态环境.The soil nitrogen content, enzyme activities, and their relationships in the pure forest of Cupressus funebris and mixed forest of C. funebris ＋ Cyclobalanopsis glauca in Ruxi River watershed were investigated in the Three Gorges Reservoir Area. The results showed that the content of ammonium nitrogen in three soil layers （0 -20,20 -40, and 40 - 60 cm） under the two forest stands were similar. However, the total nitrogen content in each soil layer of the mixed forest was respectively 61. 1%, 55.7%, and 19.8% higher than those of the pure forest, and the differences were all significant. Compared to the pure forest, the nitrate nitrogen content in each soil layer of the mixed forest was also increased 10.3% , 10.5% , and 25.5 % , respectively. The nitrogen content of soil microbial biomass in each soil layer of the mixed forest was respectively 1.2, 1.0 ,and 1.6 times higher than those of the pure forest. Moreover, the activities of protease, catalase, urease, and invertase in each soil layer of the mixed forest were significantly higher than those of the pure forest. The results indicated that, compared to the pure forest of C. funebris, the mixed forest of C. funebris ＋ Cyclobalartopsis glauca could obviously improve soil enzyme activities, soil nitrogen conditions, and ecological environment in the stand.

关 键 词：柏木纯林 柏木+青冈混交林 土壤氮素 酶活性 

分 类 号：S714.2[农业科学—林学]