期刊文献+

土壤呼吸与土壤有机碳对不同秸秆还田的响应及其机制 被引量:26

Response of Soil Respiration and Organic Carbon to Returning of Different Agricultural Straws and Its Mechanism
原文传递
导出
摘要 以黄豆、玉米、水稻这3种农业秸秆为原料,崇明东滩围垦土地为试验样区,以景观植物地肤草为目标植物,研究土壤呼吸和土壤有机碳对不同秸秆还田的响应及其可能的机制.结果表明,不同秸秆直接还田的土壤呼吸和地上植物量均高于对照组;黄豆秸秆还田后土壤呼吸相对最低,土壤有机碳最高,因此黄豆秸秆还田的土壤碳封存能力高于玉米和水稻秸秆.秸秆还田显著促进土壤微生物活性,增加了土壤微生物量以及β-糖苷酶、脱氢酶活性,脱氢酶活性与土壤呼吸相关性最显著.黄豆秸秆还田脱氢酶活性最低,相应的土壤呼吸也最低.黄豆秸秆纤维素、木质素和C/N含量最高,可降解性最低,表明黄豆秸秆难以被微生物降解利用,因而还田后其土壤微生物活性最低,最终导致最低的土壤呼吸和较高的土壤有机碳. Soybean,maize and rice straws were selected as raw materials to study the response of the soil respiration( SR) and soil organic carbon( SOC) to returning of different straws in the Chongming Dongtan area. The results showed that all of SR,SOC and the plant biomass of the lands with returning of different straws were higher than those of the controls. The soil with soybean straw returning possessed the lowest SR and highest SOC among the three kinds of straws,meaning its higher soil organic carbon sequestration capability than corn and maize straws returning. Straw returning significantly enhanced soil dehydrogenase,β-glycosidase activities and microbial biomass,and soil dehydrogenase activity was significantly correlated with soil respiration. The dehydrogenase activity of the soil with soybean straw returning was the lowest,thus,the lowest SR and highest SOC. Soybean straw had the highest cellulose and lignin contents and the lowest N content among the three kinds of straws,resulting in its lowest biodegradability. Therefore,when soybean straw was returned to soil,it was difficult to degrade completely by soil microorganisms,thus the lowest soil microbial activity,eventually leading to the lowest SR and highest SOC.
出处 《环境科学》 EI CAS CSCD 北大核心 2016年第5期1908-1914,共7页 Environmental Science
基金 国家自然科学基金项目(21577101) 上海市科委重大科技攻关项目(14231200404)
关键词 土壤有机碳 土壤呼吸 还田秸秆 土壤微生物 可生物降解性 soil organic carbon soil respiration straw returned soil microorganisms biodegradability
  • 相关文献

参考文献30

二级参考文献384

共引文献586

同被引文献494

引证文献26

二级引证文献360

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部