Effects of cultivation on N20 emissi

Effects of cultivation on N20 emission and seasonal quantitative variations of related microbes in a temperate grassland

Laboratory and in situ experiments were done to investigate the influences of cultivation on temperate semi-arid grassland (for 17years spring wheat planted once every two years without fertilization) on soil N2O emission and quantitative variations of related soil microbes.In the laboratory (25℃ and soil moisture 18% ), cultivation increased soil transformations of fertilizer nitrogen ( 100 μg N/g as NaNO3, urea,or as urea with dicyandiamide I μg N/g). The N2O emissions from the cultivated and uncultivated soils with or without nitrogen additions were relatively Iow, and mainly originated from the nitrification. The soil N2O emission due to cultivation decreased somewhat upon no fertilization or NaNO3 addition, but significantly upon urea addition. The role of dicyandiamide as nitrification inhibitor was only considerable in the cultivated soil, and had small influence on decreasing N2O emission in the two soils. The influence of cultivation on soil N2O emission was also reflected by the number variations of microbes related with soil nitrogen transformation in the two soils. Compared to the uncultivated grassland, in situ ammonifiem and denitrifiers in the cultivated grassland quantitatively averagely increased, and aerobic no-symbiotic azotobacters were quantitatively similar, leading to the continued decrease of organic matter content and the decrease of N2O emission from the cultivated grassland soil.

作 者： HUANG Bin CHEN Guan-xiong   作者单位： Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences,  刊 名： 环境科学学报(英文版)  ISTIC SCI 英文刊名： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2001 13(3)  分类号： Xl31.1 Q14  关键词：  

【Effects of cultivation on N20 emissi】相关文章：

Cause and Effects of Iron Deficiencies05-04

Effects of Formaldehyde Inhalation on Lung of Rats04-27

Environmental Effects on Microstructural Stability of SiC/SiC Composites04-26

Evaluation of dust activity and climate effects in North China04-26

EFFECTS OF ENSO ON THE RELATIONSHIP BETWEEN IOD AND SUMMER RAINFALL IN CHINA04-27

Effects of nutrients on Microcystis growth more easily forming bloom04-25

Effects of sleep deprivation on gamma oscillation of waking human EEG04-26

Effects of methamidophos and glyphosate on copper sorption-desorption behavior in soils04-25

Effects of Ca on the distribution,structure and morphology of aluminum species in polyaluminum chloride04-27

Analysis of sextupole effects on 13 function beating in the SSRF storage ring04-27