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Karyati .
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Effect of Vegetation Diversity on Erosion Rate Sri Sarminah; Farha Shera Prititania; Karyati .
Agrifor : Jurnal Ilmu Pertanian dan Kehutanan Vol 17, No 2 (2018): Oktober
Publisher : Universitas 17 Agustus 1945 Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31293/af.v17i2.3621

Abstract

The climate in Indonesia is a tropical climate with high rainfall, making Indonesia vulnerable to erosion. In addition to high rainfall, vegetation, slope and soil types also affect erosion. This study aims to determine the Important Value of Species (NPJ), the relationship between rainfall and surface runoff and the mass of eroded soil and the level of erosion hazard at different vegetation densities. Important Value The highest types of the three dominating types in plot I were Schima wallichii 115.12%, Macaranga gigantea 69.38% and Cratoxylum sumatranum 44.69%. Whereas in plot II the highest NPJ value of three types dominates, namely Macaranga gigantea 59.13%, Litsea angulata 39.52% and Aquilaria mallacensis 35.37%. The amount of eroded soil mass that occurred in PUE I was 0.13 tons / ha / year and PUE II was 0.19 tons / ha / year. Simple linear analysis of the relationship between rainfall and eroded soil mass at PUE I has a correlation value (r) = 0.79 with the equation Y = -8.34 + 0.39X, whereas in PUE II the correlation value (r) = 0.90 with the equation Y = -12.96 + 0.56X. The danger level of erosion (TBE) in PUE I and PUE II was very mild (erosion rate <15 tons / ha / year, Bahya Erosion I class with soil solum depth> 90 cm).
PARAMETER-PARAMETER CURAH HUJAN YANG MEMPENGARUHI PENAKSIRAN INDEKS EROSIVITAS HUJAN DI SRI AMAN, SARAWAK Karyati .
Agrifor : Jurnal Ilmu Pertanian dan Kehutanan Vol 14, No 1 (2015): Maret
Publisher : Universitas 17 Agustus 1945 Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31293/af.v14i1.1103

Abstract

The soil erosion in some areas can be serious and may continue for such a period that most fertile soil may be lost. Rainfall is the main factor that may result soil erosion.  The rainfall erosivity factor used in the Universal Soil Loss Equation (USLE) is ability of rainfall to cause soil erosion.  However, there is insufficiency of information available on the estimation of rainfall erosivity index and its rainfall parameters in Sarawak.  The aims of this study were to estimate rainfall erosivity index based on Bols Formula and to examine the rainfall parameters influencing its estimation in Sri Aman, Sarawak, East Malaysia.  The climate data such as monthly rainfall, monthly raindays, and maximum rainfall for the last 27 years (1983-2009) were collected from Meteorology Department Malaysia (Sarawak Branch).  The annual rainfall erosivity index during the analysed period was the highest in 1995 (4194.10) and the lowest in 2006 (1832.37).  The highest and lowest values of annual rainfall had also recorded in these years (425.81 cm in 1995 and 236.43 cm in 2006).  The average annual rainfall, raindays, maximum rainfall, and rainfall erosivity index were 336.50 cm, 227 days, 11.23 cm, and 2929.18, respectively.  The average rainfall erosivity index on monthly basis showed that the maximum value was 348.31 in January and the minimum value was 169.00 in June.  The estimation of annual rainfall erosivity index was very influenced by rainfall parameters, namely, annual rainfall, annual raindays, and maximum rainfall.  The information on rainfall erosivity index is useful as a basis for planning and designing appropriate soil and water conservation practices in Sarawak.
Effect of Vegetation Diversity on Erosion Rate Sarminah, Sri; Prititania, Farha Shera; ., Karyati
Agrifor : Jurnal Ilmu Pertanian dan Kehutanan Vol 17, No 2 (2018): Oktober
Publisher : Universitas 17 Agustus 1945 Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31293/af.v17i2.3621

Abstract

The climate in Indonesia is a tropical climate with high rainfall, making Indonesia vulnerable to erosion. In addition to high rainfall, vegetation, slope and soil types also affect erosion. This study aims to determine the Important Value of Species (NPJ), the relationship between rainfall and surface runoff and the mass of eroded soil and the level of erosion hazard at different vegetation densities. Important Value The highest types of the three dominating types in plot I were Schima wallichii 115.12%, Macaranga gigantea 69.38% and Cratoxylum sumatranum 44.69%. Whereas in plot II the highest NPJ value of three types dominates, namely Macaranga gigantea 59.13%, Litsea angulata 39.52% and Aquilaria mallacensis 35.37%. The amount of eroded soil mass that occurred in PUE I was 0.13 tons / ha / year and PUE II was 0.19 tons / ha / year. Simple linear analysis of the relationship between rainfall and eroded soil mass at PUE I has a correlation value (r) = 0.79 with the equation Y = -8.34 + 0.39X, whereas in PUE II the correlation value (r) = 0.90 with the equation Y = -12.96 + 0.56X. The danger level of erosion (TBE) in PUE I and PUE II was very mild (erosion rate <15 tons / ha / year, Bahya Erosion I class with soil solum depth> 90 cm).
Co-Authors Farha Shera Prititania Prititania, Farha Shera Sarminah, Sri Sri Sarminah, Indirwan .