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.
By using acetylene inhibition method, this paper studied the soil denitrifying enzyme ac- tivity （DEA） and its affecting factors in the riparian zone with different land use types （ cropland ri- parian, 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） Ixg N ~ kg-1 ~ h-~, which differed obvi- ously among different land types, with a decreasing trend of forested riparian zone 〉 cropland ripari- an 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 car- bon, and affected the soil nitrogen transformation, and thus, inhibited the occurrence of riparian soil denitrification.
出处
《应用生态学报》
CAS
CSCD
北大核心
2013年第10期2926-2932,共7页
Chinese Journal of Applied Ecology
基金
国家科技支撑计划项目(2010BAK69B16-1-3)
沼渣液无害化利用与低污染型有机肥制备技术项目(11230705600)资助
关键词
崇明岛
河岸带
土地利用类型
反硝化酶活性
Chongming Island
riparian zone
land use type
denitrifying enzyme activity.
