SIMULASI MODEL DINAMIK PENGARUH LEGUME COVER CROPS (LCC) TERHADAP LIMPASAN DAN SEDIMEN DI LAHAN HUTAN TANAMAN (Dynamic model simulation of the effects of Legume Cover Crops (LCC) on runoff and sediment in plantation forest land)

Agung Budi Supangat, Putu Sudira, Haryono Supriyo, Erny Poedjirahajoe

Abstract


Declining productivity of plantation forest due to low soil fertility. This condition has forced  managers to make efforts in manipulating the tree growing environment. One such effort is by introducing cover crops species from legumes (LCC), to control surface runoff, soil erosion and input nutrient into the soil. The research aims to determine the effectiveness of LCC in controlling total runoff and sedimentation in Eucalyptus pellita plantations, through dynamic model simulation. The dynamic model of STELLA version 9.0.2 was used to study water and nutrient cycles, focused on the application of LCC to reduce total runoff and sedimentation. The results showed that LCC could drop the total runoff of average 35% in the 1 - 2 years old. In the 1styear it decreased from 1,530 mm to 994 mm, while in the 2ndyear it decreased from 1,240 mm to 806 mm. The declining also occurred in the sediment content, in the 1st year it decreased from 12.20 tonnes/ha to 7.93 tonnes/ha, and the 2nd year it decreased from 6.63 tonnes/ha to 4.36 tonnes/ha. These research findings can be used by the environmental manager  to minimize potential land degradation, especially during the post-harvest until the young plantations (0-2 years old) phases.

Keywords


plantation forest; E. pellita; dinamic model; legume cover crops; erosion; runoff

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DOI: https://doi.org/10.20886/jppdas.2018.2.1.17-34

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