干旱区生态环境知识资源中心(Arid): Organic amendments and gypsum reduce dispersion and increase aggregation of two sodic Vertisols

Arid

DOI	10.1016/j.geoderma.2022.116047
	Organic amendments and gypsum reduce dispersion and increase aggregation of two sodic Vertisols
	Niaz, Sara; Wehr, J. Bernhard; Dalal, Ram C.; Kopittke, Peter M.; Menzies, Neal W.
通讯作者	Wehr, JB
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2022
卷号	425
英文摘要	Sodic soils are widespread in semi-arid and arid regions of the world, with agricultural production on these soils constrained due to structural instability resulting from high concentration of exchangeable sodium (Na). The structural instability results in clay dispersion, reduced infiltration, crust formation and poor seed germination. One way to decrease undesirable effects of Na on soil structure is to apply gypsum (G) and organic amendments. We evaluated the effect of G and four organic amendments [polyacrylamide (PAM), feedlot manure (FLM), chicken manure (CM), and lucerne pellets (LP)] on two sodic soils. These amendments differed in their chemical nature as assessed by C-13 cross-polarisation magic angle spinning nuclear magnetic resonance (C-13 CPMAS NMR) spectroscopy after amended soils were incubated for 60 d at field water capacity. Gypsum reduced dispersion but had no effect on macroaggregates or aggregate mean weight diameter (MWD). Using principal component analysis, we found that aryl C and O-aryl C functional groups were positively correlated with microaggregates and the silt + clay fraction, and O-alkyl C and di-O alkyl C were positively correlated with soil dispersion after 1 d of soil incubation. The CM reduced dispersion more than FLM, LP, or PAM, although LP increased the proportion of large macroaggregates and MWD. We also found that large macroaggregates and MWD were positively correlated with microbial respiration and dissolved organic carbon. Except for the G + LP amendment, G had no synergistic effect with other organic amendments on macroaggregates and MWD of the two sodic soils. This study demonstrates that the functional groups of organic amendments and microbial activity play important roles in aggregation and dispersion of sodic soils. This study also demonstrates that a combination of gypsum and organic amendments will be a better option to ameliorate sodic soils by decreasing dispersion and increasing aggregate formation.
英文关键词	Sodic soil Aggregate stability in water Sodium adsorption ratio Mean weight diameter Carbon functional groups
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000847217000009
WOS关键词	BIOLOGICAL BINDING-AGENTS ; SOIL AGGREGATION ; MICROBIAL COMMUNITY ; STABILITY ; MATTER ; CARBON ; QUALITY ; DECOMPOSITION ; AUSTRALIA ; RESIDUES
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/2XILL650/392918
推荐引用方式 GB/T 7714	Niaz, Sara,Wehr, J. Bernhard,Dalal, Ram C.,et al. Organic amendments and gypsum reduce dispersion and increase aggregation of two sodic Vertisols[J],2022,425.
APA	Niaz, Sara,Wehr, J. Bernhard,Dalal, Ram C.,Kopittke, Peter M.,&Menzies, Neal W..(2022).Organic amendments and gypsum reduce dispersion and increase aggregation of two sodic Vertisols.GEODERMA,425.
MLA	Niaz, Sara,et al."Organic amendments and gypsum reduce dispersion and increase aggregation of two sodic Vertisols".GEODERMA 425(2022).