Data/hora: 16/06/2024 17:26:07

Provedor de dados: 	117	
País: 	Chile	
Título: 	Land use impacts on physical-based soil organic matter fractions on three hillside Ferrasols in Mexico	
Autores: 	Matus,Francisco; Hidalgo,Claudia; Monreal,Carlos; Estrada,Isabel; Fuentes,Mariela; Etchevers,Jorge.	
Data: 	2011-06-01	
Ano: 	2011	
Palavras-chave: 	Soil C and N; Sand-size; SOM saturation; Ultrasonic dispersion.	
Resumo: 	The effects of cultivation in hillside (&gt; 30% slope) on soil C and N stocks after forest clearance and subsequent cultivation in new re-growth forest sites not always induce rapid soil organic matter (SOM) loss in subtropical areas. In the present study we evaluated the sensitivity to SOM changes of material floatable in water (Fw), coarse sand (&gt; 250 mm), fine sand (50-250 mm), silt (2-50 mm) and clay (0-2 mm) fractions by the impact of cultivation of Mexican Ferrasols. This research also determined the relative degree of C and N saturation in the silt and clay size particles. The soil physical fractions were obtained after ultrasonic vibration and sedimentation. Soil organic matter stock (0-20 cm depth) in cultivated sites ranged from 54 to 146 Mg C ha-1 and from 3.9 to 7.1 Mg N ha-1 and in the forest soil 46-94 Mg C ha-1 and 3.7-5.1 Mg N ha-1. The relative distribution of C and N was lower in the coarse sand and highest in the silt fraction; the latter paralleled the changes of whole soil C and N. Coarse sand was the most sensitive fraction responding to cultivation, thus representing a diagnostic pool to assess the SOM shifts under cultivation. Half of our studied soil showed a low degree of C and N saturation in the silt and clay fraction indicating potential for accumulation of C and N, while the other half were well above the saturation limit.	
Tipo: 	Journal article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200014	
Editor: 	Instituto de Investigaciones Agropecuarias, INIA	
Formato: 	text/html	
Fonte: 	Chilean journal of agricultural research  v.71 n.2 2011