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Land-use change reduces soil nitrogen retention of both particulate and mineral-associated organic matter in a temperate grassland

文献类型：期刊论文

作者Yang, Lu1; Liu, Weixing1; Jia, Zhou1; Li, Ping1; Wu, Yuntao1; Chen, Yaru1; Liu, Chao1; Chang, Pengfei1; Liu, Lingli1
刊名CATENA
出版日期2022
卷号216
关键词N-15 labeling Tillage Winter snow cover N-15 recovery Particle density fractions
ISSN号0341-8162
DOI10.1016/j.catena.2022.106432
文献子类Article
英文摘要Soil organic matter (SOM) fractions vary in formation and microbial activities, thus playing different roles in exogenous nitrogen (N) retention in terrestrial ecosystems. However, it remains unclear how land-use and environmental changes affect the behavior of SOM fractions in retaining exogenous N. Here, we investigated N distribution among four SOM fractions and how soil N retention capacity responds to tillage and increased snowfall. We monitored N retention in SOM fractions by adding (NH4NO3)-N-15-N-15 isotope in the field in a temperate grassland in Inner Mongolia. Our results showed that the fine mineral-associated organic matter (MOM < 20 mu m) had the largest N pool with a lower mass. The free particulate organic matter (fPOM) accounted for only 0.8% of total SOM mass, representing the second-largest N pool. The coarse mineral-associated organic matter (MOM > 20 mu m) represented the fewer N pool with the largest mass. MOM < 20 mu m and fPOM retained > 90% of the N-15 tracer in soil. Deepened snow did not affect N-15 retention in SOM fractions, while tillage decreased N-15 retention in MOM < 20 mu m, fPOM, and occluded particulate organic matter within aggregates (oPOM). We suggested that the reduction in soil total N retention under tillage conditions was mainly due to the reduced N retention in fPOM and MOM < 20 mu m. Structural equation modeling analysis revealed that tillage-induced decrease in N-15 retention of MOM < 20 mu m was regulated by both decreased microbial N-15 retention and reduced clay and silt contents. The decrease in N-15 retention of fPOM was probably due to the decreased microbial N-15 retention along with the increased plant N-15 uptake. This research reveals divergent pathways of N-15 retention among different SOM fractions in response to land-use change and provides novel insights into the estimation of soil N retention capacity with SOM fractions taken into consideration.
学科主题Geosciences, Multidisciplinary ; Soil Science ; Water Resources
出版地AMSTERDAM
电子版国际标准刊号1872-6887
WOS关键词MICROBIAL BIOMASS ; SEQUESTRATION POTENTIALS ; TERRESTRIAL ECOSYSTEMS ; DIFFERENT TILLAGE ; CARBON STORAGE ; WIND EROSION ; SNOW DEPTH ; FRACTIONS ; WINTER ; MECHANISMS
WOS研究方向Science Citation Index Expanded (SCI-EXPANDED)
语种英语
WOS记录号WOS:000820129900003
出版者ELSEVIER
资助机构National Natural Science Foundation of China [32171595, 32125025, 31988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDA26010303]
源URL[http://ir.ibcas.ac.cn/handle/2S10CLM1/29014]  
专题植被与环境变化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Xiangshan, Beijing 100093, Peoples R China
2.Univ Chinese Acad Sci, Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Lu,Liu, Weixing,Jia, Zhou,et al. Land-use change reduces soil nitrogen retention of both particulate and mineral-associated organic matter in a temperate grassland[J]. CATENA,2022,216.
APA Yang, Lu.,Liu, Weixing.,Jia, Zhou.,Li, Ping.,Wu, Yuntao.,...&Liu, Lingli.(2022).Land-use change reduces soil nitrogen retention of both particulate and mineral-associated organic matter in a temperate grassland.CATENA,216.
MLA Yang, Lu,et al."Land-use change reduces soil nitrogen retention of both particulate and mineral-associated organic matter in a temperate grassland".CATENA 216(2022).

入库方式： OAI收割

来源：植物研究所

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