热带作物学报2012，Vol.33Issue(1)：5-10,6.DOI:10.3969/j.issn.1000-2561.2012.01.002
晚稻根际土壤特性对CH4和N2O排放的影响
Effects of Late Rice Rhizospheric Soil Characteristics on CH4 and N2O Emission from Paddy Field
摘要
Abstract
An, one-year field experiment was conducted to measure in situ the greenhouse gases emission fluxes of the late rice cultivars in Hunan double-cropping rice areas and the correlation between the greenhouse gases emission and the characteristics of rice rhizospheric soil was studied to probe the effect of rice rhizospheric soil characteristics on methane and nitrous oxide emission by the method of static opaque chamber / modified gas chromatography . The results showed that the seasonal average emission fluxes of CH4 and N2O were different among rice cultivars, and their variation ranges were from 9.27 to 14.57 mg/(m2/h) and from 7.16 to 15.28 μg/(m2/h), respectively. CH4 emission fluxes were significantly negatively correlated with the Eh of 5cm depth soil (p<0.01), and were significantly positively correlated with the 5cm depth soil pH values (p<0.05). The negative correlation was not significant between N2O emission flux and 5cm soil Eh, however, the significantly negative correlation existed between the N2O emission flux and the pH values of 5cm depth soil (p<0.05). At the late rice growth stages, CH4 emission fluxes were significantly positive correlation with the CH4 contents of 0~7 cm, 7~13 cm and 13-20 cm depth soil solution (p<0.05), and the N2O emission fluxes were significantly positive correlation with the N20 content of 7-13 cm depth soil (p<0.05). In addition, there were significantly negative correlation among CH4s N2O emission fluxes and the pH of O~7 cm, 7~13 cm, 13~20 cm depth soil (p<0.05), and CH4 emission fluxes were significantly positive correlation with the conductivity of 0~7 cm, 7~13 cm, 13~20 cm depth soil solution (p<0.01), but the negative correlations were not significant between N2O emission fluxes and the conductivity of soil solution. Therefore, Eh, pH, conductivity and CH4, content of rice rhizosphere soil solution were the key factors that influenced CH4 emission from the paddy soil, and the rhizospheric soil pH was closely related with N2O emission.关键词
水稻/品种/CH4/N2O/排放通量/根际土壤特性Key words
Rices Cultivar, CH4/ N2O/ Emission flux/ Rhizospheric soil characteristic分类
资源环境引用本文复制引用
傅志强,朱华武,陈灿,黄璜..晚稻根际土壤特性对CH4和N2O排放的影响[J].热带作物学报,2012,33(1):5-10,6.基金项目
粮食丰产科技工程项目(No.2011BAD16B01) （No.2011BAD16B01）
国家科技攻关计划项目(No.2008BAD95B02)和湖南省自然科学基金项目(No.09JJ5011). （No.2008BAD95B02）
