崇明岛不同土地利用类型河岸带土壤反硝化酶活性特征

应用生态学报

崇明岛不同土地利用类型河岸带土壤反硝化酶活性特征

陈刚亮,李建华^**,杨长明

(同济大学环境科学与工程学院/长江水环境教育部重点实验室，上海 200092)

出版日期:2013-10-18 发布日期:2013-10-18

Characteristics of soil denitrifying enzyme activity in riparian zones with different land use types in Chongming Island, Shanghai of China.

CHEN Gang-liang, LI Jian-hua, YANG Chang-ming

(Ministry of Education Key Laboratory of the Yangtze River Water Environment, College of Environment Science and Engineering, Tongji University, Shanghai 200092, China)

Online:2013-10-18 Published:2013-10-18

摘要/Abstract

摘要：

以崇明岛河岸带为研究对象，采用乙炔抑制法，研究了不同土地利用类型河岸带(农田河岸带、林地河岸带、草地河岸带)土壤反硝化酶活性及其影响因素.结果表明：河岸带反硝化酶活性在(0.69±0.11)～(134.93±33.72) μg N·kg^-1·h^-1，不同土地类型河岸带土壤反硝化酶活性存在明显差异，整体趋势为林地河岸带>农田河岸带>草地河岸带.河岸带表层土壤(0～10 cm)反硝化酶活性与其他土层(10～30、30～50和50～70 cm)呈显著差异(P<0.05).反硝化酶活性与土壤有机碳、土壤全氮和土壤硝态氮呈极显著正相关关系(P<0.01).土地利用类型的变化主要通过改变河岸带土壤自然结构和理化性质、降低土壤有机质的积累、影响土壤氮素的转化，从而抑制河岸带土壤反硝化作用的发生.

Abstract: By using acetylene inhibition method, this paper studied the soil denitrifying enzyme activity (DEA) and its affecting factors in the riparian zone with different land use types (cropland riparian, forested riparian, and grassy riparian zones) in Chongming Island, Shanghai of China. The riparian soil DEA was (0.69±0.11) - (134.93±33.72) μg N·kg^-1·h^-1, which differed obviously among different land types, with a decreasing trend of forested riparian zone > cropland riparian zone > grassy riparian zone. The soil DEA was significantly (P<0.05) higher in 0-10 cm in 10-30, 30-50, and 50-70 cm layers. There were significant positive relationships between soil DEA and soil TOC, TN, and NO₃^--N (P<0.01). Land use change mainly altered the soil natural structure and soil physical and chemical properties, decreased the accumulation of soil organic carbon, and affected the soil nitrogen transformation, and thus, inhibited the occurrence of riparian soil denitrification.

陈刚亮,李建华**,杨长明. 崇明岛不同土地利用类型河岸带土壤反硝化酶活性特征[J]. 应用生态学报.

CHEN Gang-liang, LI Jian-hua, YANG Chang-ming. Characteristics of soil denitrifying enzyme activity in riparian zones with different land use types in Chongming Island, Shanghai of China.[J]. Chinese Journal of Applied Ecology.