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Cacao leaf litter decomposition under different moisture and pH : Characteristic of soil N mineralization (NH4+, and NO3- ) and Greenhouse gas CO2, CH4, N2O flux emission
Nahdia (a*), Yo Toma PhD(b), Prof. Samuel Paembonan(c)

a)Environmental Science of Graduate School of Hasanuddin University, Indonesia. Contact email: nahdia[at]pasca.unhas.ac.id. b) Laboratory of Soil Science and Plant Nutrition of Faculty of Agriculture, Ehime University, Japan. Contact email: toma[at]agr.ehime-u.ac.jp.
c) Laboratory of Silviculture and Plant Physiology Forestry Faculty of Hasanuddin University, Indonesia. Contact email: samuelap[at]unhas.ac.id.


Abstract

Plants litter as soil organic matter turn over to soil in decomposition process. Decomposition is regulated by numerous factors, most important is environmental factor in soil include water content to define moisture and pH. In this study, we set up an experiment cacao leaf litter decomposition in soil with cacao leaf litter and soil (no cacao leaf litter) as a control. Decomposition cacao leaf litter study applied in 50mL polypropylene bottle with 100 g air-dried soil. For the litter-amended treatments, 2 g (oven dry weight) with 2 mm sized cacao leaf litter applied on the soil surface. The soil was amended with two factors, soil moisture and soil pH: Soil water content 30% pH 4.9 (SLWC30i), water content 30% pH 6.2 (SLWC306), water content 60% pH 4.9 (SLWC60i), water content 60% pH 6.2 (SLWC606), water content 90% pH 4.9(SLWC90i), water content 90% pH 6.2 (SLWC906). All treatment incubated in the dark at 25◦C for 28 days. Extractable NO3- and NH4+concentrations, and soil greenhouse gases (CO2, CH4, N2O) were measured by Gas Chromatograph (GC-14A and GC-8A) equipped with TCD for CO2, FID for CH4, and ECD for N2O. The significance level was set at P < 0.05. Significant level different analyzed using statistic R software version Ri386.3.6.0. Extractable NH4+, and NO3-concentrations performed various result between treatment. Highest NH4+ concentration was showed highest in SWC906 (30.7 mg N kg-1), and highest NO3- concentration was shown in SLWC606 (87.1 mg N kg-1). CO2 flux was significantly highest in SLWC90i (930 mg C g-1 hr-1) and cumulative CO2 emission was 107.36 kg C ha-1 period-1in SLWC90i.

Keywords: Decomposition, Cacao leaf litter, Extractable NH4+, and NO3- concentrations, CO2, CH4, N2O emissions.

Topic: Climate Change

Link: https://ifory.id/abstract/qRNKtD3zMTFA

Conference: The 2nd International Conference on Global Issue for Infrastructure, Environment, and Socio-Economic Development (GIESED 2019)

Plain Format | Corresponding Author (nahdia nahdia)

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