干旱区生态环境知识资源中心(Arid): A two-step modelling approach to map the occurrence and quantity of soil inorganic carbon

Arid

DOI	10.1016/j.geoderma.2020.114382
	A two-step modelling approach to map the occurrence and quantity of soil inorganic carbon
	Filippi, Patrick; Cattle, Stephen R.; Pringle, Matthew J.; Bishop, Thomas F. A.
通讯作者	Filippi, P
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2020
卷号	371
英文摘要	Soil inorganic carbon (SIC) accounts for approximately 30-40% of global soil carbon stocks and up to 90% of total carbon stocks in arid and semi-arid regions. The quantity of SIC can vary considerably over short distances, and SIC primarily accumulates at depth as carbonates, which makes it a challenge to model and map across space. Furthermore, carbonates are not found in all soils, meaning that many datasets of SIC are zero-inflated and highly skewed compared to the distributions of other soil properties. This study uses data from a soil survey performed in 2015 to model and map subsoil (0.3-0.5 m) inorganic carbon content in a semi-arid, irrigated cotton-growing region in the lower Lachlan River valley in south-west New South Wales, Australia. A two-step mixture model is used to overcome the zero-inflated and highly skewed nature of the SIC dataset. Such an approach involves using a random forest model to initially predict the presence or absence of SIC in the study area, then using a separate model to predict SIC content using values from the dataset that are above-zero only. The two maps produced from this process are then combined to create a SIC content map. This two-step method had more accurate predictions when compared to a simple one-step modelling approach. Overall, the two-step mixture model proved useful for mapping SIC content, and shows promise for modelling other environmental properties that have a similar zero-inflated and skewed distribution.
英文关键词	Mixture model Two-step model Presence-absence model Digital soil mapping
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000533627500009
WOS关键词	SEQUESTRATION ; IRRIGATION ; SCALE
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/2XILL650/324495
作者单位	[Filippi, Patrick; Cattle, Stephen R.; Bishop, Thomas F. A.] Univ Sydney, Sch Life & Environm Sci, Sydney Inst Agr, Sydney, NSW, Australia; [Pringle, Matthew J.] Dept Environm & Sci, Brisbane, Qld, Australia
推荐引用方式 GB/T 7714	Filippi, Patrick,Cattle, Stephen R.,Pringle, Matthew J.,et al. A two-step modelling approach to map the occurrence and quantity of soil inorganic carbon[J],2020,371.
APA	Filippi, Patrick,Cattle, Stephen R.,Pringle, Matthew J.,&Bishop, Thomas F. A..(2020).A two-step modelling approach to map the occurrence and quantity of soil inorganic carbon.GEODERMA,371.
MLA	Filippi, Patrick,et al."A two-step modelling approach to map the occurrence and quantity of soil inorganic carbon".GEODERMA 371(2020).