同位素2018，Vol.31Issue(2)：65-76,12.DOI:10.7538/tws.2017.youxian.066
连续施用不同量污泥堆肥对土壤氮组分及δ15N的影响
Effects of Continuous Application of Composted Sewage Sludge on Soil Organic Nitrogen Fractions and δ15N in Sandy Fluvo-aquic Soil
摘要
Abstract
In order to provide a theoretical basis for fertilizing and improving sandy fluvo-aquic soil quality,soil total nitrogen,content of different fractions of active organic nitrogen and soil δ15N values were determined after continuous application of nonhazardous composted sewage sludge (SW) in this study.Four-year field experiment was conducted in a wheat-maize rotation crop field during 2013-2016 in Henan province,China.Based on different fractions of soil active organic nitrogen and stable nitrogen isotope technology,and the response of soil physical and chemical properties,we studied the response of soil active organic nitrogen and soil δ15N values to composted sewage sludge.The results were that 1) Continuous application of SW significantly raised the content of soil carbon and nitrogen,with 265.83％ and 284.31％ increase,respectively,by the 45 t · hm-2 SW treatment in comparison with the control group (CK).The SW treatments significantly enhanced the active organic nitrogen component content and the particulate organic nitrogen (PON) by 104.57％-280.91％.The content of active nitrogen components in the treatment were presented as particulate organic nitrogen (PON)＞light fraction organic matter nitrogen (LFON)＞dissolved organic nitrogen (DON)＞soil microbial biomass nitrogen (SMBN).The allocation of PON/TN and SMBN/TN increased,and the allocation of LFON/TN and DON/TN significantly decreased withthe increasing application of SW,which resulted in decrease of the total distribution proportion of active nitrogen,indicating that the 45 t · hm-2 SW treatment contained enough stable organic nitrogen components for the accumulation of organic nitrogen.2) Soil amended with SW significantly reduced soil δ15N values.The pathway analysis and the principal components analysis revealed that the rate of SW had a significantly effect on the soil δ15N values and soil nitrogen content,while correlation analysis showed that soil δ15N values had the strong relationship with the soil TN,PON and LFON contents,which indicated that the δ15N could reflected the effect of soil improvement with the SW.3) Redundancy analysis further revealed that soil pH,soil moisture and soil fertility had significant effects on the content of soil active organic nitrogen fractions and their δ15N values.Soil pH and soil integrated fertility index (IFI) were the most significant factors influencing soil active organic nitrogen fractions and their δ15N values (P＜0.05),and they could explain 48.2％ and 17.5％ of the variation respectively,through the redundancy analysis.The results showed that four years of SW application,particularly the 45 t · hm-2 SW treatment,could significantly increase the soil nitrogen content and nitrogen quality,and thus improved the soil fertility.δ15N could be used as a good indicator for the dynamic changes of soil nitrogen and soil quality after SW application.关键词
无害化污泥堆肥/土壤培肥/沙质潮土/稳定性氮同位素/土壤活性有机氮Key words
nonhazardous composted sewage sludge/soil fertility/sandy fluvo-aquic soil/stable nitrogen isotope/soil active organic nitrogen分类
化学化工引用本文复制引用
郭康莉,张水勤,冀拯宇,刘晓,周吉祥,姜慧敏,杨俊诚,李桂花,张建峰..连续施用不同量污泥堆肥对土壤氮组分及δ15N的影响[J].同位素,2018,31(2):65-76,12.基金项目
国家自然科学基金项目(21577172,41501322) （21577172,41501322）
国家国际科技合作专项(2015DFA20790) （2015DFA20790）
国家重点研发计划项目(2016YFE0101100) （2016YFE0101100）
中央级公益性科研院所科研业务费专项(No.1610132016043) （No.1610132016043）
