Abstract
Rainfed paddy soils that are derived from lacustrine and include of E4 agroclimatic zone have many unique properties and potentially for paddy and corn plantations. This sreseach was aimed to: (1) study the soil development of rainfed paddy soils derived from lacustrine and (2) evaluate rainfed paddy soils potency for paddy and corn in Paguyaman. Soil samples were taken from three profiles according to toposequent, and they were analyzed in laboratory. Data were analyzed with descriptive-quantitative analysis. Furthermore, assessment on rainfed paddy soils potency was conducted with land suitability analysis using parametric approach. Results indicate that all pedon had evolved with B horizons structurization. However, pedon located on the summit slope was more developed and intensely weathered than those of the shoulder and foot slopes.The main pedogenesis in all pedons were through elluviation, illuviation, lessivage, pedoturbation, and gleization processes. The main factors of pedogenesis were climate, age (time) and topography factors. Therefore, P1 pedons are classified as Ustic Endoaquerts, fine, smectitic, isohypertermic; P2 as Vertic Endoaquepts, fine, smectitic, isohypertermic; and P3 as Vertic Epiaquepts, fine, smectitic, isohypertermic. Based on the potentials of the land, the highest of land suitability class (LSC) of land utilization type (LUT) local paddy was highly suitable (S1), while the lowest one was not suitable with nutrient availability as the limiting factor (Nna). The highest LCS of paddy-corn LUT was marginally suitable with water availability as the limiting factor (S3wa), while the lower LSC was not suitable with nutrient availabily as the limiting factor (Nna). Keywords: Corn, lacustrine, land suitability, paddy, rainfed paddy soil
Highlights
In terrestrial ecosystem, explanation impact of human activity on biodiversity mostly dominated by the studies from aboveground communities (Hooper et al 2005)
During one year period of the research, a total of 828 individual consisting of 39 genera of soil fauna as ecosystem engineers was collected from the different age of cocoa plantation
Ecological diversity variation within soil fauna community as ecosystem engineers in the different age of small-holder cocoa plantation showed that species diversity was related to the age of cocoa plantation
Summary
Explanation impact of human activity on biodiversity mostly dominated by the studies from aboveground communities (Hooper et al 2005). The new approach proposed by Parker (2010) that biodiversity should not considered only on the number of species and functional groups of the species in the community. Belowground ecosystem and functional group of species was neglected, because of the absence of direct economical values (Decaens 2006) and ‘charismatic’ species of soil fauna (Susilo et al 2004). The soil fauna has an indirect effect on economical values through their functional groups activity such as ecosystem engineers (Decaens et al 2006). Some experimental studies showed that soil fauna diversity strongly related to decomposition and nutrient cycling through their functional groups activities as detritivorous, omnivorous, predator, or ecosystem engineers (Swift et al 2004).
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