水土保持通报2025，Vol.45Issue(2)：38-44,7.DOI:10.13961/j.cnki.stbctb.2025.02.005
黑土区不同种类凋落物输入对土壤氮素的影响
Effects of different litter inputs on soil nitrogen fractions in black soil regions
摘要
Abstract
[Objective]The impact of different litter inputs on soil nitrogen fractions during the process of returning farmlands to forests in typical black soil regions was explored,in order to provide a theoretical basis for soil nutrient regulation,tree species selection for afforestation,and vegetation restoration.[Methods]The experiment included three treatments(Populus alba litter,Larix gmelinii litter,and maize straw)and a blank control.The litter from each treatment was mixed with air-dried soil and incubated at 25 ℃ for 28 days.The content of soil nitrogen components and the activities of the two enzymes[β-glucosidase(βG)and urease(URE)]were then measured.Variance analysis and Pearson's correlation were used to investigate how different litter inputs affect soil nitrogen and enzyme activities in black soil regions.[Results]Variance analysis showed that at 3,7,14,and 28 days,the total nitrogen(TN)values in the P.alba litter treatment were significantly higher than those in the control,L.gmelinii litter,and maize straw treatments(p＜0.05).The input of the three kinds of litter did not significantly impact the soil available nitrogen(AN)content.For microbial biomass nitrogen,inorganic nitrogen,and enzyme activities(MBN),the P.alba litter treatment displayed a significantly greater increase at 7 and 14 days compared to the control and the other two treatments(p＜0.05).At 28 days,the MBN values in both the P.alba and L.gmelinii litter treatments were significantly higher than those in the control and maize straw treatments(p＜0.05).All litter treatments significantly reduced the soil's inorganic nitrogen content.βG was highly or significantly negatively correlated with NH4+-N and NO3--N;it was highly positively correlated with URE,TN,and AN.URE was significantly or highly significantly correlated with TOC,MBN,and TN and negatively correlated with NH4+-N.[Conclusion]The decomposition of the three types of exogenous inputs was closely linked to the soil's TN,the AN,MBN,inorganic nitrogen,and enzyme activities.Litter input promoted soil nutrient cycling and accumulation,with litter input from the broadleaf tree species P.alba having the most significant impact on improving soil nitrogen and enzyme activities.关键词
黑土/土壤无机氮/凋落物添加/酶活性Key words
black soil/soil inorganic nitrogen/litter input/enzyme activity分类
农业科技引用本文复制引用
张玉坤,李温静,肖璐璐,王南超,崔湘驰,夏祥友..黑土区不同种类凋落物输入对土壤氮素的影响[J].水土保持通报,2025,45(2):38-44,7.基金项目
国家重点研发计划课题"黑土农田侵蚀阻控原理及水土保持措施效应"(2021YFD1500705) （2021YFD1500705）
