干旱区生态环境知识资源中心(Arid): Additive effects of organic and inorganic amendments can significantly improve structural stability of a sodic dispersive subsoil

Arid

DOI	10.1016/j.geoderma.2021.115281
	Additive effects of organic and inorganic amendments can significantly improve structural stability of a sodic dispersive subsoil
	Fang, Yunying; Singh, Bhupinder Pal; Van Zwieten, Lukas; Collins, Damian; Pitt, Wayne; Armstrong, Roger; Tavakkoli, Ehsan
通讯作者	Fang, YY (corresponding author), NSW Dept Primary Ind, Elizabeth Macarthur Agr Inst, Menangle, NSW 2568, Australia. ; Tavakkoli, E (corresponding author), NSW Dept Primary Ind, Wagga Wagga Agr Inst, Wagga Wagga, NSW 2650, Australia.
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2021
卷号	404
英文摘要	Sodic dispersive subsoils pose significant constraints to agricultural productivity and sustainability in arid and semiarid regions. Gypsum and organic amendments (OAs) have shown the potential to improve soil structure and fertility and may address constraints associated with these dispersive soils. However, the mechanistic linkages between the quality of OAs, and the dynamics of soil structural stability (i.e., soil aggregates), particularly under the interactive impacts of gypsum and exogenous nutrients, remain elusive. We quantified aggregate stability (i.e., wet mean weight diameter, WMWD) and the accumulation of OA-carbon (C) in different aggregate-classes in a dispersive clay subsoil (delta C-13 -24.5 parts per thousand) with or without the application of OAs (delta C-13 -12.8 to -14.3 parts per thousand), gypsum and/or exogenous nutrients (nitrogen (N) and phosphorus (P)) over the 270 days incubation period. The OAs include sorghum stubble and sugarcane bagasse that were low C quality (e.g., C:N:P ratio of 328:6.2:1 and 850:17.3:1, respectively) and less decomposed (e.g., low alkyl-C/o-alkyl-C ratio), and sugarcane mill mud that was high C quality (C:N:P ratio of 17:1.4:1) and more decomposed status. The results suggest that the quality of OAs is likely to control the dominant mechanisms of soil aggregation: (i) a quick top-down formation of aggregate hierarchy (similar to 31 days) in the low C quality and less decomposed OAs; and (ii) a slow bottom-up formation of aggregate hierarchy (>= 90 days) in the high C-quality and more decomposed OA. Over time, lowering the C-nutrient stoichiometric ratio of OAs (via exogenous nutrients) decreased aggregate stability by 30%, owing to accelerated breakdown/loss of OAs (i.e., by 16%). The exchangeable Ca2+ (from gypsum) was positively correlated to WMWD and water stable aggregates (>0.05 mm), which were not influenced by OAs or nutrients. In this dispersive clay subsoil, a long-term positive effect on soil aggregation occurred when improving either biochemical properties (e.g., microbial biomass and soil organic C) or chemical properties (e.g., soil dispersion, exchangeable sodium percentage, and pH), and an additive effect appeared when both properties were changed. This study provides critical information on the effects of OAs with variable C qualities, gypsum, and nutrients on structural stability with insights into strategies of sodic subsoil amelioration and soil C storage.
英文关键词	Gypsum Isotope Amelioration Soil constraints Alkaline soil Solonetz
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000700886000011
WOS关键词	SOIL AGGREGATE STABILITY ; NUTRIENT STOICHIOMETRY ; EXCHANGEABLE CATIONS ; MATTER ACCUMULATION ; PHYSICAL-PROPERTIES ; RESIDUE QUALITY ; USE EFFICIENCY ; CARBON ; CLAY ; STABILIZATION
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363389
作者单位	[Fang, Yunying; Singh, Bhupinder Pal; Collins, Damian] NSW Dept Primary Ind, Elizabeth Macarthur Agr Inst, Menangle, NSW 2568, Australia; [Van Zwieten, Lukas] NSW Dept Primary Ind, Wollongbar Primary Ind Inst, Wollongbar, NSW 2477, Australia; [Pitt, Wayne; Tavakkoli, Ehsan] NSW Dept Primary Ind, Wagga Wagga Agr Inst, Wagga Wagga, NSW 2650, Australia; [Armstrong, Roger] Dept Econ Dev Jobs Transport & Resources, Horsham, Vic 3400, Australia; [Tavakkoli, Ehsan] Charles Sturt Univ, Graham Ctr Agr Innovat, Wagga Wagga, NSW 2650, Australia; [Tavakkoli, Ehsan] Univ Adelaide, Sch Agr Food & Wine, Glen Osmond, SA 5064, Australia
推荐引用方式 GB/T 7714	Fang, Yunying,Singh, Bhupinder Pal,Van Zwieten, Lukas,et al. Additive effects of organic and inorganic amendments can significantly improve structural stability of a sodic dispersive subsoil[J],2021,404.
APA	Fang, Yunying.,Singh, Bhupinder Pal.,Van Zwieten, Lukas.,Collins, Damian.,Pitt, Wayne.,...&Tavakkoli, Ehsan.(2021).Additive effects of organic and inorganic amendments can significantly improve structural stability of a sodic dispersive subsoil.GEODERMA,404.
MLA	Fang, Yunying,et al."Additive effects of organic and inorganic amendments can significantly improve structural stability of a sodic dispersive subsoil".GEODERMA 404(2021).