摘要
为了研究土壤理化特性对农田N2 O排放的影响 ,室外盆栽试验于 2 0 0 0年冬小麦生长季在南京农业大学实施 ,1 8个供试土壤分别取自江苏宜兴、江宁、六合、仪征及宝应等地的水稻土 .所有供试土壤的季节性N2 O平均排放通量为 1 94 8± 80 1μg (m2 ·h) ,最低和最高值分别为 61 0 μg (m2 ·h)和 393 6μg (m2 ·h) ,两者相差约 6 5倍 .单因子相关分析表明 :季节性N2 O平均排放通量与土壤有机碳含量、全N含量及C N比成显著负相关 ,相关系数 (r2 )分别为 0 541 6(p <0 0 0 1 )、0 450 8(p<0 0 1 )及 0 370 5 (p <0 0 1 ) ;排放通量与土壤pH成正相关 ,r2 为 0 4535 (p <0 0 1 ) .本研究未发现N2 O排放与土壤质地、磷。
To identify the key soil parameters influencing N 2O emission from wheat growing season, an outdoor pot experiment with a total of 18 Chinese soils was conducted in Nanjing, China during 2000 01 wheat growing season. Seasonal average rate of N 2O emission for all the 18 soils was 194 8±80 1?μg/m 2/h, ranging from 61.0 to 393 6?μg/m 2/h, approximately a 6 5 fold difference between the maximum and the minimum Correlation analysis indicated that the seasonal average of N 2O emission was negatively correlated with soil organic carbon ( r 2=0 5416, p <0 001), soil total nitrogen ( r 2=0 4508, p <0 01) and the ratio of C/N ( r 2=0 3705, p <0 01), respectively. A positive dependence of N 2O emission on the soil pH ( r 2=0.4535, p <0 01) was also observed No clear relationship existed between N 2O emission and above ground biomass of the wheat crop at harvest.
出处
《环境科学学报》
CAS
CSCD
北大核心
2002年第5期598-602,共5页
Acta Scientiae Circumstantiae
基金
中国科学院"百人计划"项目
国家重点基础研究发展规划项目 (G19990 1 1 80 5)
美国航天航空总署TECONASA项目
