华南农业大学学报2024，Vol.45Issue(6)：856-864,9.DOI:10.7671/j.issn.1001-411X.202405021
长期低投入的稻鱼共作对土壤养分循环及有机碳库稳定性的影响
Effects of long-term low-input rice-fish co-culture on soil nutrient cycling and organic carbon pool stability
摘要
Abstract
[Objective]To investigate the changes in soil organic carbon pool,nutrient stoichiometric ratios and so on under a long-term low-input rice-fish co-culture system,deeply analyze the carbon pool dynamics in the rice-fish system,and enhance its ecological functions.[Method]The study focused on the long-term low-input rice-fish co-culture system in Chenxi County,a representative county of traditional rice-fish co-culture in Hunan.The changes in soil nutrient content,physical-chemical property,nutrient storage,organic carbon component,stoichiometric ratio and carbon pool indexes within the rice-fish co-culture systems,which have been in operation for 15 years(RF15)and 50 years(RF50),were analyzed,and the key influencing factors were explored.[Result]Compared with rice monoculture(RM),RF15 showed significant reductions in soil organic carbon/total nitrogen/total phosphorus/nitrate nitrogen/ammonium nitrogen/available phosphorus contents,organic carbon storage/nitrogen storage/phosphorus storage,readily oxidized organic carbon content and its proportion in organic carbon;The C∶N,pH,particulate organic carbon content and its proportion,mineral-associated organic carbon content proportion,carbon pool activity,and carbon pool activity index increased significantly by 47.98%,13.15%,35.47%,72.24%,31.68%,58.07%,and 58.07%respectively.RF50 showed significant increases in total nitrogen content,C∶P,N∶P,and nitrate nitrogen content by 13.13%,33.08%,14.31%,and 51.52%respectively,while total phosphorus content,volume weight,organic carbon storage,phosphorus storage,readily oxidized organic carbon content,mineral-associated organic carbon content and its proportion decreased significantly.The carbon pool management indexes in RF15 and RF50 remained stable overall,and were both greater than 100.Under the long-term rice-fish model,the environmental factors significantly related to the stability index of soil organic carbon pool were total nitrogen content,C∶N,and organic carbon storage.[Conclusion]Although the low-input rice-fish co-culture system may lead to nutrient loss,the extended self-maintenance of the system enables it to recover nutrient storage autonomously.Long-term rice-fish co-culture can improve soil quality,and improve the ecological environment of rice field.The findings provide a theoretical basis for optimizing the rice-fish co-culture system,which could help enhance its ecological functions and sustainability.关键词
稻鱼共作/养分含量/养分储量/化学计量比/碳库管理指数Key words
Rice-fish co-culture/Nutrient content/Nutrient storage/Stoichiometry/Carbon pool management index分类
农业科技引用本文复制引用
李龙燚,魏征,李谊慈,邹龙,何金峰,王华,徐华勤..长期低投入的稻鱼共作对土壤养分循环及有机碳库稳定性的影响[J].华南农业大学学报,2024,45(6):856-864,9.基金项目
国家自然科学基金区域创新发展联合基金重点项目(U21A20184) （U21A20184）
