摘要
为了提高设施农田氮素利用,减轻土壤氮素积累,本研究利用饲用甜高粱为供试作物,将腐植酸和生物炭作为供试材料进行盆栽试验,研究腐植酸和生物炭按照不同比例配合施用对饲用甜高粱氮素吸收与土壤氮变化的影响。试验设对照、生物炭、腐植酸、腐植酸+生物炭、腐植酸+1/2生物炭、1/2腐植酸+生物炭等6个处理。结果表明:腐植酸和生物炭不同配比各处理中,1/2腐植酸+生物炭处理地上部吸氮量占植株总吸氮量最大,说明此处理可以使氮素向地上部比例增加,对于饲用甜高粱氮素吸收效果较好;腐植酸+生物炭处理可以降低土壤氮素含量,有利于土壤氮素转化。因此,腐植酸和生物炭按照适宜比例进行配合施用对提高氮素利用率、促进土壤氮素转化、降低土壤氮素积累有积极作用。
The paper aims to improve soil nitrogen utilization and reduce nitrogen accumulation in greenhouse soil.Taking feeding sweet sorghum as a test crop and the humic acid and biochar as the test materials for pot experiment,the effects of humic acid and biochar application with different proportions on nitrogen absorption and soil nitrogen change of feeding sweet sorghum were studied.The experiment set 6 treatments,i.e.,CK,biochar,humic acid,humic acid+biochar,humic acid+1/2 biochar,1/2 humic acid+biochar.The results showed that:feeding sweet sorghum under the treatment of the 1/2 humic acid+biochar treatment had the largest nitrogen absorption in shoots,indicating the treatment could increase the proportion of nitrogen to the shoots,and improved the nitrogen absorption of feeding sweet sorghum;humic acid+biochar treatment could reduce soil nitrogen content and was good for soil nitrogen transformation.Therefore,the combination of humic acid and biochar with a suitable ratio has a positive effect on increasing nitrogen utilization rate,promoting soil nitrogen transformation and reducing soil nitrogen accumulation.
作者
赵思文
王茜
卢树昌
张宇
Zhao Siwen;Wang Xi;Lu Shuchang;Zhang Yu(College of Aronomy&Resources and Enviromont,Tianjin Agricultural University,Tianjin 300384)
出处
《中国农学通报》
2020年第18期93-96,共4页
Chinese Agricultural Science Bulletin
基金
国家重点研发计划项目“高氮磷残留土壤修复与污染控制技术集成示范”(2016YFD0801006)
天津市重点研发计划科技支撑重点项目“设施农田氮磷累积环境风险综合控制与土壤质量提升技术集成与应用”(19YFZCSN00290)
关键词
腐植酸
生物炭
高氮土壤
氮素吸收
饲用甜高粱
盆栽
humic acid
biochar
high-nitrogen soils
nitrogen absorption
feeding sweet sorghum
potted culture
