Infiltration effectiveness of Alfisols under albazia and coconut trees and in barren land in the middle part of Bogowonto Watershed, Central Java - Indonesia

摘要

Surface runoff is the source of soil erosion, leading to soil resources degradation in the hilly and the mountainous areas. Albazia is a common revegetation trees at the study area as a source of annual income. Coconut is a traditional plantation tree becoming a source of daily income from its sap and/or monthly income from its fruit. This study was based on field observations during 20 rainfall generated runoff. The collected research data were rainfall intensity, stemflow, throughfall, infiltration, and physico-chemical characteristics of the soil. The results show that the effective infiltration under Albazia trees, under coconut trees, and in barren land respectively 11%, 38% and -39% respectively. Physiological characteristics of Albazia and coconut which include canopies, stems, and roots have controled the soil capacity of infiltration. The barren land which is only covered by grass and bush vegetation is becoming the main source of runoff in the study area.