植物营养与肥料学报2025，Vol.31Issue(12)：2431-2444,14.DOI:10.11674/zwyf.2025067
不同比例有机肥替代化肥对稻麦轮作体系固碳增产的协同效应
Synergistic effects of different organic fertilizer-to-chemical fertilizer substitution ratios on carbon sequestration and yield increase in rice-wheat rotation system
摘要
Abstract
[Objectives]This study investigated the synergistic effects of partial substitution of chemical fertilizers with organic fertilizers at different ratios on soil carbon sequestration and crop yield,aiming to propose an optimum ratio used in the rice-wheat rotation system.[Methods]A two-year field experiment was carried out in a rice-wheat rotation system in Suizhou,Hubei Province.A total of 11 treatments were set up,including:no fertilization control,farmers'habitual fertilization,recommended fertilization(RF),and RF without N fertilizer,without P fertilizer,with 6 organic substitution ratios from 10%to 100%(RFM10,RFM20,RFM30,RFM40,RFM50,M100).Soil and plant samples were collected during the harvesting period of the rice and wheat,and the components of soil active and passive carbon pools,crop yield,and indexes for nitrogen use efficiencies were measured and analyzed.[Results]1)Compared with RF,all the organic substitution treatments,except RFM10,significantly increased soil organic carbon,total N and available P by 12.8%-35.7%,3.4%-19.6%,and 21.2%-195.4%,respectively,and enhanced soil pH by an average of 0.22 units.2)RFM30 and M100 treatments demonstrated the highest passive carbon pool,which as 30.9%and 41.0%higher than RF did.More than 40%of organic substitution increased the soil liability index by 4.9%and 7.8%,and the soil carbon pool management index by 23.1%and 21.8%in rice and wheat seasons,respectively,relative to those of RF.The carbon sequestration index among the 6 organic substitution treatments was similar in the rice season,while that of RFM30 treatment in the wheat season was significantly higher than those of the other treatments,except for the RFM10 treatment.3)With the increasing of organic substitution ratio,the crop yields and nitrogen use efficiency showed a trend of first rising and then falling,peaking in RFM30 with the increase of crop yields by 6.28%and nitrogen agronomic use efficiency by 74.91%,compared to RF.4)The results of correlation and partial least squares path modeling analysis revealed that the soil passive carbon pool correlated closer with crop yield than the active carbon pool;that is,the higher content of the passive carbon pool,the higher crop yield.[Conclusions]On the basis of recommended fertilization,substitution of part of the chemical fertilizer by organic fertilizers could realize the multiple targets of improving soil nutrient supply,enhancing the carbon sequestration of soil,and increasing crop yields and nitrogen utilization efficiency.The organic substitution ratio of 30%shows the highest comprehensive effectiveness,therefore,it is recommended in the rice-wheat rotation system in the middle and lower reaches of the Yangtze River.关键词
稻麦轮作/有机肥替代比例/增产效应/固碳指数/碳库管理指数/氮素利用率Key words
rice-wheat rotation/organic substitution ratio/yield enhancement/carbon sequestration index/carbon pool management index/nitrogen use efficiency引用本文复制引用
GUO Yang-yan,CAI Hong-yun,JI Qing-yu,LIANG Guo-qing,WU Jian-fu,CHEN Jie..不同比例有机肥替代化肥对稻麦轮作体系固碳增产的协同效应[J].植物营养与肥料学报,2025,31(12):2431-2444,14.基金项目
国家自然科学基金地区基金项目(32360799) （32360799）
江西省自然科学基金项目(20232BAB25043). （20232BAB25043）
