干旱区生态环境知识资源中心(Arid): Soil organic carbon in peninsular Spain: Influence of environmental factors and spatial distribution

Arid

DOI	10.1016/j.geoderma.2020.114365
	Soil organic carbon in peninsular Spain: Influence of environmental factors and spatial distribution
	Calvo de Anta, R.; Luis, E.; Febrero-Bande, M.; Galinanes, J.; Macias, F.; Ortiz, R.; Casas, F.
通讯作者	de Anta, RC
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2020
卷号	370
英文摘要	Soil organic carbon (SOC) stocks and their geographical distribution in peninsular Spain were estimated from a georeferenced database consisting of 12,724 surface samples (0-30 cm) and 3607 subsurface samples (30-50 cm), covering different climate, land use, elevation, parent material, soil type and soil pH. SOC density showed a high heterogeneity, with the lowest values in arid regions, where the average in topsoil ranged between 20 and 60 t C ha(-1), under woody crops and forest respectively. Carbon stocks gradually increases as precipitation increases, and its variability is also dependent of other factors, fundamentally the presence/ab- sence of active lime or active Al. In semi-arid zones, calcaric soils (pH approximate to 8.3) have higher contents of SOC than neutral to weakly acidic soils from siliceous materials. However, in humid regions, calcareous materials have undergo total or partial decarbonatation in the upper layer (pH < 4.0-7.5) and SOC stocks are markedly lower than in other materials. In forest soils it seems that a steady state (around 100-120 t C ha(-1)) (0-30 cm) has been reached in a wide range of precipitation, between 900 and 1700 mm; most of this carbon (about 80%) is labile-C. Soils from granitic rocks are acidic (pH 4.5-5.5) (Al buffering) and the mean SOC stock in the indicated precipitation range is between 170 and 200 t ha(-1) (it is estimated that approximately 60% is stabilized as metal-C or mineral-C complexes). The highest values (190-240 t ha(-1)) are recorded in acidic soils derived from mafic rocks, which in these regions usually develop andic properties (around 73% is involved in stable metal-C or mineral C complexes). Finally, the SOC stored in neutral soils from serpentinized ultramafic rocks (without excess Ca or Al) is similar to that of the decarbonated soils derived from calcareous materials. In all regions, forest soils are a much more important SOC sink than live forest biomass (2-4 times higher in the upper 30 cm and 3-6 times greater in the upper 50 cm). Random Forest regression was used as modeling tool and digital mapping. Mean annual precipitation was estimated to be the most important predictor variable, followed by land use, lithology/soil type and soil pH. Model performance was calibrated by the internal RF validation and through cross-validation, and the results were similar. In topsoil, the mean error, root mean square error and R-2 were - 0.007% C, 1.48% C and 0.61, respectively. In the subsurface layer these indices were - 0.020, 1.07 and 0.37, respectively. SOC stock for peninsular Spain was estimated at 3.33 Pg in the upper (0-30 cm) layer, and 0.85 Pg in the subsurface (30-50 cm) layer. Total SOC stock for 0-50 cm was 4.19 Pg, with a 95% confidence interval ranging between 3.33 and 5.03 Pg.
英文关键词	Soil organic carbon Digital soil organic carbon map Random forests Peninsular Spain
类型	Article
语种	英语
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:000528270900015
WOS关键词	RANDOM FOREST ; STOCKS ; GALICIA ; EUROPE ; STORAGE ; PYROPHOSPHATE ; UNCERTAINTY ; TEMPERATE ; STABILITY ; CLIMATE
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/2XILL650/324359
作者单位	[Calvo de Anta, R.; Luis, E.; Galinanes, J.; Macias, F.; Casas, F.] Univ Santiago de Compostela, Dept Edaphol & Agr Chem, Campus Vida 15782, Santiago De Compostela, Spain; [Febrero-Bande, M.] Univ Santiago de Compostela, Fac Math, Dept Stat Math Anal & Optimizat, Campus Vida 15782, Santiago De Compostela, Spain; [Ortiz, R.] Univ Murcia, Dept Agr Chem Geol & Pedol, Campus Espinardo, E-30100 Murcia, Spain
推荐引用方式 GB/T 7714	Calvo de Anta, R.,Luis, E.,Febrero-Bande, M.,et al. Soil organic carbon in peninsular Spain: Influence of environmental factors and spatial distribution[J],2020,370.
APA	Calvo de Anta, R..,Luis, E..,Febrero-Bande, M..,Galinanes, J..,Macias, F..,...&Casas, F..(2020).Soil organic carbon in peninsular Spain: Influence of environmental factors and spatial distribution.GEODERMA,370.
MLA	Calvo de Anta, R.,et al."Soil organic carbon in peninsular Spain: Influence of environmental factors and spatial distribution".GEODERMA 370(2020).