中国水土保持科学2017，Vol.15Issue(2)：9-17,9.DOI:10.16843/j.sswc.2017.02.002
改变碳输入对南亚热带海岸沙地典型天然次生林土壤呼吸的影响
Changes of carbon input influence soil respiration in a typical natural secondary forest on southern subtropical sandy coast
摘要
Abstract
[Background] Globally,the pool of carbon in soils is greater than the pool contained in vegetation or the atmosphere,and changes in soil carbon content can therefore greatly affect the global carbon budget.Soil respiration is an essential process of carbon cycling in terrestrial ecosystems,thus the knowledge about influence of environmental factors and carbon input on soil respiration is critical for ecosystem management.[Methods] Four 20 m × 20 m permanent fixed plots were established in a natural secondary forest in December 2014 in southeastern coast of Fujian Province,China,and four carbon input manipulations of root exclusion,litter exclusion,double litter and control(normal carbon inputs) were carried out in each plot.Monthly soil respiration (Rs) under different carbon input manipulations were measured by Li-8100 from March 2015 to February 2016.In addition,the dissolved organic carbon and microbial biomass carbon were determined after Rs measurement.One-way analysis of variance (ANOVA) with Duncan's multiple comparison method was used to test the differences of Rs,soil temperature and soil moisture between different carbon input manipulations,besides the linear and nonlinear regression models were used to describe the relationship between seasonal Rs,soil temperature and soil moisture.[Results] The results showed that no significant difference was found for soil temperature and soil moisture at 10 cm depth between different treatments (P ＞ 0.05).The seasonal pattern of Rs was obviously,which was higher in summer and lower in winter during the study period,and the highest fluxes observed in May 2015 or June 2015 and the lowest fluxes occurred in November 2015 or December 2015.The range of annual mean Rs for different treatments was double litter ＞ control ＞ root exclusion ＞ litter exclusion,and all Q10 values in different carbon input manipulations were lower than that in control.The contribution of mineral soil,litter layers and roots to total soil respiration was 41.24％,43.29％ and 15.45％,respectively.Rs was significantly and exponentially correlated with soil temperature and linearly and positively correlated with soil moisture at 10 cm depth (P ＜ 0.05).The bifactor models integrated W10with T10 explained 45％ ～ 69％ of the variations for Rs.The soil dissolved organic carbon and microbial biomass carbon were also influenced by carbon input changes,and the mean Rs significantly correlated with soil dissolved organic carbon and microbial biomass carbon concentration.[Conclusions] Our findings suggested that carbon input manipulations induced changes in soil labile carbon,and subsequently caused significant effects on soil respiration.关键词
南亚热带/沙质海岸/天然次生林/土壤呼吸/碳输入/Q10值Key words
southern subtropical/sandy coast/natural secondary forest/soil respiration/carbon input/Q10 values分类
农业科技引用本文复制引用
高伟,叶功富,黄志群,陈智勇,余再鹏,岳新建,陈梦瑶..改变碳输入对南亚热带海岸沙地典型天然次生林土壤呼吸的影响[J].中国水土保持科学,2017,15(2):9-17,9.基金项目
国家自然科学基金“亚热带人工林树种对土壤氮吸收和转化的影响”(41371269) （41371269）
“亚热带森林土壤氮梯度、植物养分与土壤有机质来源变化耦合关系”(31570604) （31570604）
福建省属公益类科研院所基本科研专项“滨海沙地造林树种转换对土壤碳循环的影响”(2014R1011-7) （2014R1011-7）
福建省森林培育与林产品加工利用重点实验室、福建省木麻黄工程技术研究中心资助 （）
