Tirtha Ayu Paramitha, Tirtha Ayu
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Growth Responses of Acacia mangium and Paraserianthes falcataria Seedlings on Different Soil Origin under Nursery Condition Paramitha, Tirtha Ayu; Mardji, Djumali
Aceh International Journal of Science and Technology Vol 4, No 3 (2015): December 2015
Publisher : Graduate School of Syiah Kuala University

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Abstract

The objective of the present study was to examine the growth responses of Acacia mangium (mangium) and Paraserianthes falcataria (sengon) seedlings growing on different soil origin under nursery condition. This study was started in September 2012 and terminated in March 2013.  The seedlings were grown from seeds sown in a plastic box filled with sterilized sands. One week after sowing, the seedlings were transplanted into polybags contained sterilized soils originated from secondary forest, Imperata cylindrica grassland and ex-coal mining. The number of all seedlings were 180 seedlings consisted of 3 different soils, 2 species of seedlings with 10 seedlings replicated 3 times. Assessment was conducted one week after transplanting, then subsequently monitored every 2 weeks, except dry weighing and counting nodules were performed at the end of the study. A completely randomized design was used in this study. The data was analyzed using Costat software. The study resulted that the different of soil origin influenced on all growth variables of mangium and sengon of 4.5 months old. The survival rate of seedlings, height and diameter increments, dry weight and root nodules were better in both species of seedlings growing on soil originated from secondary forest and Imperata grassland compared with the soil from ex-coal mining. But the survival rates of sengon seedlings were higher than that of mangium on these three soils. The highest dry weight of sengon seedlings was achieved on soil originated from secondary forest. In the present study, soil originated from secondary forest increased more in weight of shoot than root, so that the shoot-root ratio was unbalanced more than one. Based on the results of this study, it is recommended that soil from secondary forest and Imperata grassland can be used as growing media for mangium and sengon seedlings in the nursery.
NILAI KOEFISIEN LIMPASAN (C) SUB DAS TARIPA DI KECAMATAN TOAYA KABUPATEN DONGGALA PROVINSI SULAWESI TENGAH Paramitha, Tirtha Ayu; Rauf, Abdur
Jurnal Warta Rimba Vol 6, No 1 (2018)
Publisher : Universitas Tadulako

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The coefficient of surface runoff (denoted by C), in this case is strongly influenced by the watershed conditions such as gradients, soil infiltration, land use and surface water deposits. This value of C can be used as an indicator in assessing the level of damage of the watershed. Forest and land of Taripa sub-watershed in taripa village is functioned as a regulator of hydrology and also a source of water for irrigation in Sumari village, Lero and Toaya. The Taripa sub-watershed has a very important role for life. To know the tendency of hydrological characteristic of Taripa sub-watershed is better or worse, it can be investigated by observing the tendency of Taripa sub-watershed flow by calculating the runoff coefficient value (C). To calculate the runoff coefficient value, firstly the water discharge and rainfall is analyzed.This research was conducted with the aim to know the value of runoff coefficient (C) and the its function (C) of Taripa sub watershed in Taripa Village of Donggala Regency of Central Sulawesi Province. This research was planned to be implemented from September 2016 until April 2017 in Taripa Village of Toaya District of Donggala Regency, Central Sulawesi Province. The results of this study are expected to be an early information of the condition of land capability of sub-watershed Taripa in order to control the water by knowing the runoff coefficient value (C). Based on the results of the research, the daily debit value is the total of daily debit, 523,048,50 m3 reduced by the Base Flow, 78,697 m3 equals to 442,157,5 m3 with rainfall totaled 163 mm, where the highest rainfall happened on Tuesday, June 13, 65 mm, and on Wednesday, 21 June, 27 mm. The value of runoff coefficient (C) of Taripa river, based on the calculation, is 0.37. This value illustrates that the hydrologic system in the Taripa sub watershed of Taripa Village is in moderate level.