| dc.description.abstract | Soil nutrient content is dynamic, which is dependent on the amount and movement of cation-anion in the soil solution. This research was conducted to determine the amount of dissolved cations in soil solutions and to evaluate their relationship to typic hapludult soils in the tropical rainforest of Bukit Duabelas National Park (TNBD). Lisymeters are installed on each soil horizon to hold percolated water. The accumulated water sample was extracted and each cation (NH4+, Ca2+, Mg2+, K+) and anions amount and concentration (PO43-, Cl-, SO42-, NO3-) were measured. Data were analyzed using independent statistical tests, Spearman correlation, and stepwise linear regression. The results show that the total cations and anions are significantly higher in the AO horizon than the AB and B horizons. The results of the correlation analysis show that generally the cation has a strong correlation with each anion (correlation value> 0.80). The stepwise linear regression model shows that NH4+ has the strongest relationship with NO3-, PO43-, and Cl- with R2adj. = 0.75, Ca2+ to NO3-, PO43-, and SO42- (R2adj. = 0.856), Mg2+ to NO3- and PO43- (R2adj. = 0.815), and K+ to PO43- and Cl- (R2adj. = 0.845). It can be concluded that NO3-, Cl-, SO42-, and PO43- are directly involved as agents of co-pairing cations in soil nutrient movements and leaching processes. Closed nutrient cycle is the key to how forest land can maintain the fertility of the inner soil layer that receives nutrients through rainwater that enters the soil parent material through plant roots. | id |
