Nitrogen addition reduced carbon mineralization of aggregates in forest soils but enhanced in paddy soils in South China
作者机构：College of Landscape Architecture and ForestryQingdao Agricultural UniversityQingdao 266109China. Huitong Experimental Station of Forest EcologyCAS Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyChinese Academy of SciencesShenyang 110016China. Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical ForestHuitong National Research Station of Forest EcosystemHuitong 418307China. Research and Development Center for Grasses and EnvironmentBeijing Academy of Agriculture and Forestry SciencesBeijing 100097China.
出 版 物：《Ecological Processes》 (生态过程（英文）)
年 卷 期：2021年第10卷第1期
页 面：597-607页
核心收录：
学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 09[农学] 0815[工学-水利工程] 0903[农学-农业资源与环境] 0713[理学-生态学] 090301[农学-土壤学]
基 金：The National Natural Science Foundation of China(41630755 and 31971718)
主 题：Ultisol Land use type Microaggregates Soil organic carbon
摘 要：Background:Despite the crucial role of nitrogen(N)availability in carbon(C)cycling in terrestrial ecosystems,soil organic C(SOC)mineralization in different sizes of soil aggregates under various land use types and their responses to N addition is not well *** investigate the responses of soil C mineralization in different sized aggregates and land use types to N addition,an incubation experiment was conducted with three aggregate-size classes(2000,250,and 53μm)and two land use types(a Chinese fir plantation and a paddy land).Results:Cumulative C mineralization of the53-μm fractions was the highest and that of microaggregates was the lowest in both forest and paddy soils,indicating that soil aggregates enhanced soil C stability and reduced the loss of soil *** C mineralization in all sizes of aggregates treated with N addition decreased in forest soils,but that in microaggregates and the53-μm fraction increased in paddy soils treated with 100μgNg−***,the effect sizes of N addition on C mineralization of forest soils were below zero,but those of paddy soils were above *** data indicated that N addition decreased SOC mineralization of forest soils but increased that of paddy ***:Soil aggregates play an important role in soil C sequestration,and decrease soil C loss through the increase of soil C stability,regardless of land use types.N addition has different effects on soil C mineralization in different land use *** results highlight the importance of soil aggregates and land use types in the effects of N deposition on the global terrestrial ecosystem C cycle.
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