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

doi:10.1016/j.catena.2022.106432

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	Land-use change reduces soil nitrogen retention of both particulate and mineral-associated organic matter in a temperate grassland
	Yang, Lu 1; Liu, Weixing 1; Jia, Zhou 1; Li, Ping 1; Wu, Yuntao 1; Chen, Yaru 1; Liu, Chao 1; Chang, Pengfei 1; Liu, Lingli 1
刊名	CATENA
	2022
卷号	216
关键词	N-15 labeling Tillage Winter snow cover N-15 recovery Particle density fractions
ISSN号	0341-8162
DOI	10.1016/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
电子版国际标准刊号	1872-6887
出版地	AMSTERDAM
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
出版者	ELSEVIER
WOS记录号	WOS:000820129900003
资助机构	National Natural Science Foundation of China [32171595, 32125025, 31988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDA26010303]
内容类型	期刊论文
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).