Pencucian Bahan Organik Tanah Pada Tiga Penggunaan Lahan Di Daerah Hutan Hujan Tropis Super Basah Pinang-Pinang Gunung Gadut Padang

Abstract

Study about soil organic matter (SOM) leaching in soil profiles of tropical rain forest was conducted in Bukit Pinang-Pinang, the upper footslope of Mt. Gadut in West Sumatra, and in Soil Physical laboratory Andalas University Padang. Bukit Pinang-Pinang is located on 480-640 m asl and geographically is between 100°29'40" and 100°30'20 E" as well as between 0°54'55" and 0°55'45"S. This rain forest area is known as a super wet area because it receives high annual rainfall (>3500 mm). The objective of this research was to measure the amount of SOM leached from top soil into the deeper soil. Undisturbed soil samples were taken from three different land uses, forest, bush, and mixed garden, on the top, middle, and foot slopes. Undisturbed soil samples were leached with distilled water as the amount of rainfall accepted in natural condition. The results showed that, land use change from forest into ecosystems of mixed garden (for over 50 years with 100% soil surface coverage and without any cultivation) and bush land (for over 20 years left) did not cause the SOM content in the profiles decreased. Amount of SOM leached from the top 0-10 cm was found greater from mixed garden, then followed by forest on the upper slope, forest on the middle slope, and bush area.

C-organik Tanah di Perkebunan Kelapa Sawit Sumatera Utara: Status dan Hubungan dengan Beberapa Sifat Kimia Tanah

“…C-organik tanah terbentuk melalui beberapa tahapan dekomposisi bahan organik. Status Corganik tanah dipengaruhi oleh berbagai faktor eksternal seperti jenis tanah, curah hujan, suhu, masukan bahan organik dari biomasa di atas tanah, proses antropogenik, kegiatan pengelolaan tanah, dan kandungan CO2 di atmosfer (Hairiah et al 2001;Hairiah et al 2011;Yulnafatmawita et al 2011). Perubahan status C-organik tanah melalui proses dekomposisi dan mineralisasi bahan organik tanah dilaporkan memiliki keterkaitan dengan sifat-sifat tanah seperti tekstur (Augustin dan Cihacek 2016), pH, kation logam dalam tanah, KTK (kapasitas tukar kation) (Solly et al 2019), dan kandungan nitrogen (Gärdenäs et al 2011).…”

Study of Soil Biological Properties in Producing Plants and Immature Plants of Oil Palm in Aek Nabara Utara Plantation PTPN III

“…Soil organic C is formed through several stages of organic material decomposition. Soil C-Organic status is influenced by various external factors such as rainfall, soil type, temperature, above-ground biomass input, anthropogenic processes, soil processing activities, and CO2 content in the atmosphere (Hairiah et al, 2001;Hairiah et al, 2011;Yulnafatmawita et al al 2011). C-Organic plays an important role in supporting sustainable agriculture, especially as an indicator of soil fertility, maintaining the availability of soil nutrients, improving soil physical properties, and maintaining the survival of soil microorganisms (Smith et al 2013).…”

DINAMIKA KARBON DAN AKTIVITAS Β-Glukosidase DI TOPSOIL DAN SUBSOIL LAHAN PERTANIAN MONOKULTUR NAGARI ALAHAN PANJANG SUMATERA BARAT

“…Secara umum kandungan nutrisi pada lapisan subsoil lebih rendah dibandingkan topsoil disebabkan pada lapisan topsoil mendapatkan asupan bahan organik seperti penambahan pupuk dan serasah daun disekitar areal tanam sehingga kesuburannya lebih baik. Menurut Yulnafatmawita et al (2011) kandungan bahan organik tanah akan menurun seiring dengan bertambahnya kedalaman tanah.…”