摘要
采用大田试验和室内培养试验相结合的方法,研究有机肥等氮量替代化学氮肥对稻麦轮作模式下土壤有机碳赋存转化及功能酶活性的影响。结果表明:连续3年有机肥等氮量替代化学氮肥后土壤有机碳含量提高2.0%~17.5%,全氮含量提高1.4%~30.5%。替代10%最有利于提升>2.00和<0.053 mm团聚体中有机碳和全氮含量,替代40%最有利于提升0.25~2.00和0.053~0.25 mm团聚体中有机碳和全氮含量。有机肥等氮量替代化学氮肥各处理土壤有机碳矿化速率整体上高于仅施化学氮肥处理,其中替代30%、40%最有利于提升土壤有机碳累积矿化量,前者也最有利于提升土壤有机碳矿化率。有机肥等氮量替代化学氮肥处理会导致土壤外切-β-1,4-葡聚糖酶/纤维二糖苷酶(S-C1酶)活性下降,替代20%最有利于提升土壤蔗糖酶和β-葡萄糖苷酶活性,替代50%最有利于提升土壤酸性磷酸酶活性。综上,有机肥等氮量替代化学氮肥可显著提高土壤0.025~2.00和>2.00 mm团聚体碳氮含量,土壤有机碳含量与土壤全氮含量以及β-葡萄糖苷酶与土壤蔗糖酶呈显著正相关,替代20%有利于土壤有机碳矿化,替代40%有利于土壤碳固定。
A combination of field experiments and indoor culture experiments was conducted to study the effects of replacing chemical nitrogen fertilizer with equal amounts of organic fertilizer on the occurrence and transformation of soil organic carbon and the activity of functional enzymes under rice-wheat rotation.The results showed that:After three consecutive years of replacing chemical nitrogen fertilizer with equal amounts of organic fertilizer,the soil organic carbon content increased by 2.0%-17.5%,and the total nitrogen content increased by 1.4%-30.5%.Substitution of 10%was most beneficial for increasing the content of organic carbon and total nitrogen in soil aggregates with>2.00 and<0.053 mm,while substitution of 40%was most beneficial for increasing the content of organic carbon and total nitrogen in soil aggregates with 0.25-2.00 mm and 0.053-0.25 mm.The mineralization rate of soil organic carbon in each treatment of replacing chemical nitrogen fertilizer with equal nitrogen content of organic fertilizer was generally higher than that in the treatment of only applying chemical nitrogen fertilizer.Replacing 30%-40%was most conducive to improving the accumulated mineralization amount of soil organic carbon,and replacing 30%was most conducive to improving the mineralization rate of soil organic carbon.Replacing chemical nitrogen fertilizers with organic and other nitrogen fertilizers led to decreased activity of soil exo-β-1,4-glucanase/cellulosidase(S-C1enzyme).Replacing 20%was most beneficial for improving soil sucrase andβ-Glucosidase activity,and replacing 50%was most beneficial for improving soil acid phosphatase activity.In summary,replacing chemical nitrogen fertilizer with organic fertilizer significantly increased the carbon and nitrogen content of soil aggregates of 0.25-2.00and>2.00mm based on the amount of nitrogen.There was a significant positive correlation observed between soil organic carbon content and soil total nitrogen content,as well as betweenβ-Glucosidase and soil sucrase activities.Substitution of 20%was beneficial for soil organic carbon mineralization,and substitution of 40%was beneficial for soil carbon fixation.
作者
刘平
孙天翔
沈安邦
孙进宇
毛伟
居静
赵海涛
LIU Ping;SUN Tianxiang;SHEN Anbang;SUN Jinyu;MAO Wei;JU Jing;ZHAO Haitao(Key Laboratory of Cultivated Land Quality Monitoring and Evaluation of the Ministry of Agriculture and Rural Affairs,Yangzhou University,Yangzhou 225127,China;Jiangsu Yangzhou Agricultural Environmental Safety Technical Service Center,Yangzhou 225127,China)
出处
《扬州大学学报（农业与生命科学版）》
CAS
北大核心
2024年第2期19-28,共10页
Journal of Yangzhou University：Agricultural and Life Science Edition
基金
常州市科技支撑计划项目(CE20212013)。
关键词
稻麦轮作
等氮量替代
团聚体
有机碳
碳矿化
功能酶
rice-wheat rotation
replace the same amount of nitrogen
soil aggregates
organic carbon
carbon mineral-ization
functional enzymes
