Resumo

BIENES, R.; RUIZ, M.  e  MARQUES, M. J.. Soil, phosphorus and organic matter loss by water erosion in revege­tated plots with autoctonous shrubs under semi-arid climate. Rev. de Ciências Agrárias [online]. 2010, vol.33, n.1, pp.58-69. ISSN 0871-018X.

Two treatments with shrubs (Atriplex halimus (Ah) and Thymus Zygis (Tz)) were tested on hillsides from central Spain. It was studied the erosion and dif­fuse contamination by analyzing organic matter content (OM) and phosphorus (P2O5) in soil and sediments. Compared with the control treatment, Ah presented a significant decrease of runoff and erosion, 47% and 24% lower respectively, but Tz showed 12% more runoff and 152% more erosion than control. Enrichment ratios of OM and P2O5 are evident in eroded sedi­ment and also a strong relation between erosion and OM and P2O5 content was found, showing regression equations with high correlation coefficients, R=0.87 and 0.91 respectively.

Palavras-chave : bulk density; erosion; or­ganic matter; phosphorus; runoff.

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