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Soil Physical Properties and Moisture Content Affected by Site Preparation in the Afforestation of a Semiarid Rangeland

Centro de Edafología y Biología Aplicada del Segura-CSIC, Apdo. 4195, 30080 Murcia, Spain

View larger version (21K): [in a new window]   Fig. 1 Water release characteristics of the surface soil horizon (0–5 cm) in the different land treatments. Soils were sampled in January 1997. Each volumetric water content value is the mean of at least 10 replicates. The term pF means the logarithm to the base 10 of the matric suction expressed in cm. (A) Manual terraces. (B) Mechanical terraces. USR is urban solid refuse

View larger version (35K): [in a new window]   Fig. 2 Percentages of plant cover (including spontaneous recolonizing vegetation) in the different treatment combinations during April. Each value is the mean of eight replicates. Bars represent the standard error of the mean. (A) Spring 1995. (B) Spring 1996. USR is urban solid refuse

View larger version (35K): [in a new window]   Fig. 3 Two-year evolution of gravimetric soil water content in the surface soil layer of the different treatment combinations. Each value is the mean of 10 replicates (two per replication block). (A) 0–10 cm depth. (B) 10–20 cm depth. USR is urban solid refuse

View larger version (22K): [in a new window]   Fig. 4 Water depletion curves at two soil depths in the different land treatments after a rainfall event of 56 mm in November 1996. Measurements were made by time domain reflectometry. Each value is the mean of 10 replicates. Values of k (water depletion rate constants) followed by the same letter are not significantly different according to homogeneity of slopes test. (A) 0–15 cm depth. (B) 0–30 cm depth. USR is urban solid refuse

View larger version (28K): [in a new window]   Fig. 5 Evolution of water storage into the 0- to 70-cm soil layer in the different treatment combinations. Each value is the mean of at least 6 replicates. Measurements were made by the neutron probe method during a 28-mo period. Values corresponding with the manual terraces with and without USR were grouped together due to the small number of replicates in these treatment combinations. USR is urban solid refuse

View larger version (34K): [in a new window]   Fig. 6 Survival and growth of the Pinus halepensis seedlings during a 4-yr period in the different treatment combinations. Each height value is the mean of at least 75 seedlings. Bars represent the standard error of the mean. USR is urban solid refuse