Fate of Organic and Inorganic Nitrogen in Crusted and Non-Crusted Kobresia Grasslands
Zhang, L; Unteregelsbacher, S; Hafner, S; Xu, XL; Schleuss, PM; Miehe, G; Kuzyakov, Y
2017
Source PublicationLAND DEGRADATION & DEVELOPMENT
ISSN1085-3278
Volume28Issue:1Pages:166-174
AbstractA widespread pattern of the Tibetan plateau is mosaics of grasslands of Cyperaceae and grasses with forbs, interspersed with patches covered by lichen crusts induced by overgrazing. However, the fate of inorganic and organic N in non-crusted and crusted patches in Kobresia grasslands remains unknown. We reported on a field N-15-labeling experiment in two contrasting patches to compare retention of organic and inorganic N over a period of 29days. N-15 as KNO3, (NH4)(2)SO4 or glycine was sprayed onto soil surface. Crusted patches decreased plant and soil N stocks. More N-15 from three N forms was recovered in soil than plants in both patches 29days after the labeling. In non-crusted patches, N-15 recovery by the living roots was about two times higher than in crusted ones, mainly because of higher root biomass. Microorganisms in non-crusted patches were N-limited because of more living roots and competed strongly for N with roots. Inorganic N input to non-crusted patches could alleviate N limitation to plants and microorganisms, and leads to higher total N-15 recovery (plant+soil) for inorganic N forms. Compared to non-crusted patches, microorganisms in crusted patches were more C-limited because of depletion of available C caused by less root exudation. Added glycine could activate microorganisms, together with the hydrophobicity of glycine and crusts, leading to higher N-15-glycine than inorganic N. We conclude that overgrazing-induced crusts in Kobresia grasslands changed the fate of inorganic and organic N, and lead to lower total recovery from inorganic N but higher from organic N. Copyright (c) 2016 John Wiley & Sons, Ltd.
SubtypeJournal
KeywordTibetan grasslands Kobresia grasslands pasture degradation crusted patches N-15 pulse labeling
Subject AreaEnvironmental Sciences & Ecology ; Agriculture
WOS Subject ExtendedEnvironmental Sciences ; Soil Science
WOS KeywordBIOLOGICAL SOIL CRUSTS ; QINGHAI-TIBETAN PLATEAU ; ALPINE MEADOW ; MICROBIAL BIOMASS ; NORTHEAST CHINA ; CARBON BUDGET ; DEGRADATION ; LAND ; ECOSYSTEM ; MINERALIZATION
Indexed BySCI
Language英语
WOS IDWOS:000393800400015
PublisherWILEY-BLACKWELL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44134
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Zhang, L,Unteregelsbacher, S,Hafner, S,et al. Fate of Organic and Inorganic Nitrogen in Crusted and Non-Crusted Kobresia Grasslands[J]. LAND DEGRADATION & DEVELOPMENT,2017,28(1):166-174.
APA Zhang, L.,Unteregelsbacher, S.,Hafner, S.,Xu, XL.,Schleuss, PM.,...&Kuzyakov, Y.(2017).Fate of Organic and Inorganic Nitrogen in Crusted and Non-Crusted Kobresia Grasslands.LAND DEGRADATION & DEVELOPMENT,28(1),166-174.
MLA Zhang, L,et al."Fate of Organic and Inorganic Nitrogen in Crusted and Non-Crusted Kobresia Grasslands".LAND DEGRADATION & DEVELOPMENT 28.1(2017):166-174.
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