Effects of Litter Removal and Addition on Soil Nitrogen Mineralization of Eucalyptus Plantation  

作　　者：Wanpeng LU Hongying LIU Chunning LI Bin HE 

机构地区：[1]Yulin Forestry Survey and Design Institute Co.Ltd.,Yulin 537000,China [2]Guangxi State-owned Paiyangshan Forest Farm,Ningming 532500,China [3]Forestry College,Guangxi University,Nanning 530004,China

出　　处：《Agricultural Biotechnology》2022年第3期109-113,共5页农业生物技术（英文版）

基　　金：Supported by National Natural Science Foundation of China(31760201,31560206,31160152);Guangxi Innovation-driven Development Project(GK AA17204087-11)。

摘　　要：[Objectives]This study was conducted to understand the process of soil nitrogen mineralization in Eucalyptus plantations,and to identify the characteristics of soil nitrogen mineralization with different litter inputs.[Methods]With the soil of the Eucalyptus plantation in Fusui County,Guangxi as the research object,the soil nitrogen mineralization of the Eucalyptus plantation under different litter treatments(removing litter,adding litter and retaining litter)was studied by PVC tube closed-top in-situ incubation.[Results]①After 1 year of litter treatment,the inorganic nitrogen(NH_(4)^(+)-N+NO_(3)^(-)-N)in the soil of different treatments ranked as adding litter(20.15 mg/kg)>retaining litter(16.02 mg/kg)>removing litter(11.60) mg/kg),and the differences reached a significant level(P<0.05).②After 30 d of in-situ incubation,there were significant differences in soil nitrate nitrogen content before and after incubation in the three treatments(removing litter,adding litter,and retaining litter)before and after incubation(P<0.05),but no significant differences were observed in soil ammonium nitrogen content(P>0.05).Soil nitrate nitrogen contents increased from 1.47,2.01 and 1.72 mg/kg before incubation to 3.66,6.73 and 5.02 mg/kg,respectively,and soil ammonium nitrogen content increased from 11.60,20.15 and 16.02 mg/kg before incubation to 13.65,21.54 and 17.18 mg/kg,respectively.The net nitrogen mineralization quantities of the three treatments were 4.24,6.11 and 4.46 mg/kg,respectively,and the net nitrogen mineralization rates from large to small were adding litter[0.180 mg/(kg·d)]>retaining litter[0.141 mg/(kg·d)]>removing litter[0.125 mg/(kg·d)].Therefore,both removal and addition of litter affected the soil nitrogen input and nitrogen mineralization rate of the Eucalyptus plantation,thereby affecting soil nitrogen availability and the ability of soil to maintain plant-available nitrogen.[Conclusions]This study provides a theoretical basis for nutrient management in Eucalyptus plantations,especially nitrogen

关 键 词：Eucalyptus plantation LITTER PVC tube closed-top in-situ incubation Soil nitrogen mineralization 

分 类 号：S792.39[农业科学—林木遗传育种]