Data/hora: 10/06/2024 08:14:40

Provedor de dados: 	90	
País: 	Brazil	
Título: 	Quantitative Assessment of Soil Physical Quality in Northern China Based on S-theory	
Autores: 	Yang,Dejun; Bian,Zhengfu; Zhang,Kefeng; Xiong,Jibing; Lei,Shaogang.	
Data: 	2015-10-01	
Ano: 	2015	
Palavras-chave: 	Friability; Hard-setting; S index; Soil water retention curve.	
Resumo: 	ABSTRACT Quantitative assessment of soil physical quality is of great importance for eco-environmental pollution and soil quality studies. In this paper, based on the S-theory, data from 16 collection sites in the Haihe River Basin in northern China were used, and the effects of soil particle size distribution and bulk density on three important indices of theS-theory were investigated on a regional scale. The relationships between unsaturated hydraulic conductivityKi at the inflection point and S values (S/hi) were also studied using two different types of fitting equations. The results showed that the polynomial equation was better than the linear equation for describing the relationships between -log Ki and -logS, and -log Kiand -log (S/hi)2; and clay content was the most important factor affecting the soil physical quality index (S). The variation in the S index according to soil clay content was able to be fitted using a double-linear-line approach, with decrease in the S index being much faster for clay content less than 20 %. In contrast, the bulk density index was found to be less important than clay content. The average S index was 0.077, indicating that soil physical quality in the Haihe River Basin was good.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501311	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/01000683rbcs20150030	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.39 n.5 2015	
Fonte: 	info:eu-repo/semantics/openAccess