Shrub encroachment leads to accumulation of C, N, and P in grassland soils and alters C:N:P stoichiometry : A meta-analysis
Du, Zhong (China West Normal University)
Zheng, Huan (China West Normal University)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Deng, Dongzhou (Sichuan Academy of Forestry)
Cai, Xiaohu (Sichuan Academy of Forestry)
Gao, Decai (Northeast Normal University)
Nie, Shirui (China West Normal University)
He, Yanmin (China West Normal University)
Lü, Xiao-Tao (Chinese Academy of Sciences)
Li, Mai-He (Northeast Normal University)

Fecha:	2024
Resumen:	Soil stoichiometry of carbon (C), nitrogen (N), and phosphorus (P) are indicators for nutrient balance. Shrub encroachment into grasslands could change nutrient concentrations and stoichiometry in soils, but the general patterns remain unclear. With a meta-analysis of a global dataset covering 344 observations from 68 studies, we examined the responses of grassland soil C:N:P stoichiometry to shrub encroachment under various environmental conditions. Our results show that: 1) Shrub encroachment significantly increased the concentrations of soil C (+29 %), N (+25 %), P (+20 %), C:N (+5 %), C:P (+12 %), and N:P (+6 %). The magnitude of such effects varied with climate, soil texture, and soil layer. 2) Increases in SOC and TN concentrations mainly occurred in Mediterranean and very humid climate zones. Soil C:P and N:P decreased in semi-humid climate zone after shrub encroachment. 3) The increases in SOC and TN concentrations and in the C:N, C:P, and N:P ratios after shrub encroachment were greater in the topsoil than in deeper soil layers. 4) Both finest-textured soil (clay) and coarsest-textured soil (sand) are beneficial for increase of soil nutrient concentrations following shrub encroachment. 5) The magnitude of the change in soil C:N was negatively correlated with the duration of shrub encroachment, due to greater increases in soil TN than in SOC concentrations with longer durations of encroachment. Our results indicate that soil stoichiometric shifts in shrub-encroached grasslands are relatively sensitive to environmental factors, including soil texture, soil pH, and climate. These findings help us to better understand the effects of shrub encroachment on biogeochemical cycling, functioning, and services in grasslands across a broad range of spatio-temporal scales.
Ayudas:	Agencia Estatal de Investigación TED2021-132627B-I00 Agencia Estatal de Investigación PID2022-140808NB-I00 Agencia Estatal de Investigación PID2020-115770RB-I00
Nota:	Altres ajuts: Fundación Ramón Areces grant CIVP20A6621
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Global data analysis ; Shrub encroachment ; Soil stoichiometry ; Soil organic carbon ; Soil nitrogen ; Soil phosphorus
Publicado en:	Science of the total environment, Vol. 951 (November 2024) , art. 175534, ISSN 1879-1026

DOI: 10.1016/j.scitotenv.2024.175534

10 p, 5.6 MB

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