南京林业大学学报（自然科学版）2025，Vol.49Issue(3)：14-24,11.DOI:10.12302/j.issn.1000-2006.202308030
氮沉降对滇中高原地带性森林土壤呼吸的影响
Effects of nitrogen deposition on soil respiration in zonal forests in the central Yunnan Plateau
摘要
Abstract
[Objective]The study explored effects of changes in soil characteristics in zonal forests on soil respiration under nitrogen deposition in the central Yunnan Plateau.The study aimed to elucidate the mechanism underlying the response of soil respiration to nitrogen deposition in zonal forests,and provide a theoretical basis for the accurate assessment of the carbon budget and material cycle of subtropical forest ecosystems.[Method]This study focused on two types of zonal forest soils,namely,evergreen broad-leaved forests and Quercus aquifolioides forests,in the central Yunnan Plateau.The soils were treated with different gradients of nitrogen,control[0 g/(m2·a)nitrogen,CK],low nitrogen[10g/(m2·a)nitrogen,LN],medium nitrogen[20 g/(m2·a)nitrogen,MN],and high nitrogen[25 g/(m2·a)nitrogen,HN].The variations in the characteristics of soil respiration(RS),temperature(T),humidity(W),organic carbon(TOC),total nitrogen(TN),total phosphorus(TP),nitrate nitrogen(NO3--N),ammonium nitrogen(NH4+-N)content,microbial biomass carbon(MBC),and microbial biomass nitrogen(MBN)were determined under nitrogen deposition.Additionally,the correlation between soil respiration and soil characteristics were determined to elucidate the mechanism underlying the effect of nitrogen deposition on soil respiration.[Result]Compared to the CK group,soil respiration increased in the LN treatment group and decreased in the MN and HN treatment groups in the evergreen broad-leaf forests.Compared with the CK group,soil respiration increased with an increase in nitrogen application for all the treatment groups in the Q. aquifolioides forests.Soil respiration was lower in the dry season than that in the rainy season in both stands,and increased by 155.15％and 181.78％in the Q. aquifolioides and evergreen broad-leaf forests,respectively,in the rainy season compared to those in the dry season.The TOC,TN,NO3--N,and NH4+-N contents in the soil increased with the gradient of applied nitrogen in different seasons in both stands.Additionally,the contents of soil MBC in both stands were lower than that of the CK group in the rainy season at the different concentrations of nitrogen.The soil respiration of the evergreen broad-leaved forests exhibited a non-significant positive correlation with the pH,TP content and MBN(P＞0.05)in the dry and rainy seasons.Soil respiration in the Q.aquifolioides forests exhibited a non-significant positive correlation with the TOC,TN,NO3--N,and NH4+-N content,non-significant negative correlation with the TP content,MBC and MBN,and a significant negative correlation with the pH(P＜0.05)during the dry and rainy seasons.[Conclusion]Nitrogen deposition can alter soil respiration by affecting the soil chemical indicators,including the TOC,TN,TP,NO3--N,NH4+-N content,MBC,and MBN.The findings revealed that moderate nitrogen deposition can promote soil respiration,while excessive nitrogen addition can inhibit soil respiration.关键词
氮沉降/土壤呼吸/土壤特性/滇中高原Key words
nitrogen deposition/soil respiration/soil charcteristics/the central Yunnan Plateau分类
林学引用本文复制引用
宋成功,王克勤,宋娅丽,张乃木..氮沉降对滇中高原地带性森林土壤呼吸的影响[J].南京林业大学学报（自然科学版）,2025,49(3):14-24,11.基金项目
云南省教育厅科学研究基金项目(2023Y0717) （2023Y0717）
云南省农业基础研究联合专项(202301BD070001-059) （202301BD070001-059）
云南省一流学科建设项目(云教发[2022]73号) （云教发[2022]73号）
云南省自然生态监测网络项目云南玉溪森林生态站运行项目(2022-YN-13) （2022-YN-13）
云南玉溪森林生态系统国家长期科研基地项目(2020132550). （2020132550）
