SONG Qiu-lai,WANG Qiao-ran,FENG Yan-jiang,et al.Relationship Between CO2 Emission of Soil and Soil Temperature Under Maize Straw Returning in Cold Region[J].HEILONGJIANG AGRICULTURAL SCIENCES,2017,(01):28-33.[doi:10.11942/j.issn1002-2767.2017.01.0028]
寒地玉米秸秆还田条件下土壤CO2排放与土壤温度的关系
- Title:
- Relationship Between CO2 Emission of Soil and Soil Temperature Under Maize Straw Returning in Cold Region
- 文章编号:
- 1002-2767（2017）01-0028-06
- Keywords:
- cold region; maize; straw returning; soil CO2; soil temperature
- 分类号:
- S513
- 文献标志码:
- A
- 摘要:
- 为探讨寒地玉米秸秆还田条件下土壤CO2排放规律，研究不同秸秆还田方式下农田土壤CO2与耕层土壤温度的关系，采用静态箱法测定了不同秸秆还田方式下寒地黑土区春玉米生长季土壤CO2排放及土壤温度的变化情况。结果表明：玉米生育期土壤CO2排放量与土壤温度均呈现明显的季节变化，春季及秋季CO2排放通量小、土壤温度低，而CO2排放峰值及土壤温度最高值均出现在夏季，不同土层土壤温度在6月末达到最高值，而排放峰值出现在7月末至8月初；秸秆还田的排放通量显著高于不还田处理。对二者进行指数方程拟合，发现秸秆不还田条件下土壤CO2排放与土壤温度的相关性要高于秸秆还田处理；在5～25 cm耕层范围内，随着土层深度的增加，土壤CO2排放与土壤温度的相关性逐渐增加，且10、15、20、25 cm四个层次的相关性显著高于5 cm土层，表明10～25 cm土层的土壤温度变化能够更好地表述黑土农田CO2排放通量的变化趋势。
- Abstract:
- In order to investigate the CO2 emission law under maize straw returning in cold region,and the relationship between soil CO2emission and soil temperature under different straw returning methods,static box method was used to investigate the change of soil CO2 emission and soil temperature in spring maize growing season in black soil region under different straw returning ways.The results showed that there was a significant seasonal change in soil CO2 emission and soil temperature during maize growth,the CO2 emission fluxes and soil temperature was low in spring and autumn,the peak values of CO2 emission and soil temperature all appeared in summer.The soil temperature in different soil layers reached the highest at the end of June,and the emission peak appeared at the end of July to the beginning of August.The CO2 emission of maize straw returning was significantly higher than straw removal.Regression analyses for CO2emission fluxes and soil temperature were carried out,and it was found that the correlation between soil CO2emission and soil temperature was higher under straw removal than that under straw returning.In 10~25 cm soil layer,the correlation between soil CO2 emission and soil temperature increased with depth increasing,and the correlation between 10,15,20 and 25 cm soil layer was significantly higher than 5 cm soil layer,which indicated that the change of soil temperature in 10～25 cm soil layer could better describe the change trend of CO2emission fluxes in black soil field.
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备注/Memo
基金项目：国家自然科学基金资助项目（31540039）；公益性行业（农业）科研专项资助项目（2013031261）；黑龙江省政府博士后资助项目（LBHZ151196）；哈尔滨市科技创新人才项资助目（2016RAQYJ048）；黑龙江省农科院博士科研启动金项目（20150710）
第一作者简介：宋秋来（1985-），男，黑龙江省勃力县人，博士，助理研究员，从事农田温室气体排放研究。E-mail：sql142913@163.com。
通讯作者: 来永才(1964-)，男，博士，研究员，从事耕作栽培研究。E-mail: yame451@163.com。