1,629 research outputs found
Sensible heat flux of oil palm plantation: Comparing Aerodynamic and Penman-Monteith Methods
No full textDynamics of the Standardized Precipitation Evapotranspiration Index (SPEI) of an oil palm plantation area in Jambi province, Indonesia
No full textOil palm is susceptible to drought. Research to increase oil palm production continues to be developed, including the influence of drought to oil palm production. One of the methods used to analyze drought is using the Standardized Precipitation Evapotranspiration Index (SPEI). The purpose of this study is to analyze the dynamics of SPEI at diurnal, ten days periods, and monthly time scales, and their correlation with meteorological factors at an oil palm plantation in Jambi province, Indonesia for the year 2015. Using diurnal values, the SPEI does not indicate any drought as there are no values lower than -1. Using ten days periods, the SPEI shows a dry period starting from mid May to mid October. Using monthly values, the SPEI shows drought conditions with the driest month in October with SPEI reaching -2. Solar radiation and evapotranspiration are significantly correlated with the dynamics of diurnal index SPEI while precipitation affects significantly the dynamics of the SPEI at ten day and monthly periods
La descrizione delle risorse bibliografiche in linked data
No full textThe article is an appendix of the volume Come lavorare con Wikidata in biblioteca = How to work with Wikidata in the library, written by Alessandra Boccone and Tania Maio, published by Editrice Bibliografica in April 2021. In this article, after a brief introduction to Wikidata and to the construction of an element, the tables of the WikiProject Books and Periodicals are reported. They have been translated, revised and expanded by the author, for the benefit of librarians who wish to approach the creation of items of bibliographic interest, such as authors, monographs, journals, articles in linked open data. It ends with a brief reflection on the possibilities offered by Wikidata in the field of authority control
Dynamics Modeling of CO2 in Oil Palm
Full text linkOil palm plantation has a high potency to absorb carbon. Limited observed data and expensive instrumentations to measure the absorbed carbon have caused an inaccurate estimation of carbon storage from oil palm. The objectives of this research were to develop a CO2 absorption model, and to calculate the carbon cycle based on climate factors and plant age. CO2 absorption was derived from gross primary production (GPP) and net primary production (NPP), which were based on solar radiation. From NPP we derived net ecosystem exchange (NEE) by calculating the difference between NPP and soil respiration. Our results showed that age of oil palm has influenced the CO2 absorption from 9.8 (1 year) to 117 tons ha-1 year-1 (19 years), with average of 86.5 tons ha-1 year-1 (over 25-year life cycle). We validated our NPP model with biomass that indicated a very good performance of the model with R2 0.95 and RMSE 1.81. Meanwhile, the performance of NEE model was slightly lower (R2 0.71 and 0.72, for wet and dry conditions), but the model had a similar pattern with the measured NEE. Based on the model performance, the findings imply that the model is useful to estimate CO2 absorption, where there is no eddy covariance measurement. This research suggests that carbon modeling will contribute to global terrestrial carbon modeling.Oil palm plantation has a high potency to absorb carbon. Limited observed data and expensive instrumentations to measure the absorbed carbon have caused an inaccurate estimation of carbon storage from oil palm. The objectives of this research were to develop a CO2 absorption model, and to calculate the carbon cycle based on climate factors and plant age. CO2 absorption was derived from gross primary production (GPP) and net primary production (NPP), which were based on solar radiation. From NPP we derived net ecosystem exchange (NEE) by calculating the difference between NPP and soil respiration. Our results showed that age of oil palm has influenced the CO2 absorption from 9.8 (1 year) to 117 tons ha-1 year-1 (19 years), with average of 86.5 tons ha-1 year-1 (over 25-year life cycle). We validated our NPP model with biomass that indicated a very good performance of the model with R2 0.95 and RMSE 1.81. Meanwhile, the performance of NEE model was slightly lower (R2 0.71 and 0.72, for wet and dry conditions), but the model had a similar pattern with the measured NEE. Based on the model performance, the findings imply that the model is useful to estimate CO2 absorption, where there is no eddy covariance measurement. This research suggests that carbon modeling will contribute to global terrestrial carbon modeling
Comparison of Aerodynamic, Bowen-Ratio, and Penman-Monteith Methods in Estimating Evapotranspiration of Oil Palm Plantation
Full text linkOil palm is one important agricultural commodity that has high economic value. Oil palm productivity is significantly influenced by its water use (needs). Measurement and estimation of oil palm evapotranspiration is needed for determination of its water needs. Various methods are available and this study compare three methods, consisting of aerodynamic, Bowen-Ratio and Penman-Monteith methods in analyzing water needs/use of oil palms plantation located in PTPN VI Jambi. Peak of evapotranspiration rate occured in the afternoon around 13.00 and 14.00 local time. Bowen-Ratio method has higher estimation value of evapotranspiration than the other two methods. Ratio between evapotranspiration and global radiation of two and ten-years old oil palm plantations remain similar, around 47%. Penman Monteith method has the nearest estimation value to reference method (aerodynamic method) showed by the smallest RMSE value, 0.087 for two years oil palm and 0.157 for ten-years old oil palm
Evaluation of Different Runoff Curve Number (CN) Approaches on Water Regulation Services Assessment in Intermittent Micro Catchment Dominated by Oil Palm Plantation
Full text linkSurface runoff is a primary driving factor for water regulation services on oil palm plantations as it determines the hydrological components and other biogeochemical process. Therefore, understanding on their interaction and contribution within the watershed system is important to support decision-making system. Here, we applied Soil and Water Assessment Tools (SWAT) model to simulate water regulation services for an intermittent micro-catchment dominated by oil palm plantation in Harapan Landscapes, Batanghari Regency, Jambi Province. In this study, we used two different runoff curve number (CN) approaches in the SWAT model, namely the soil moisture curve number (CN-SM) and the plant evaporation curve number (CN-ET), to evaluate their applicability and uncertainty for assessing water regulation services. SWAT was automatically calibrated and validated against daily observed streamflow data. The results showed that the model performed well as indicated by hydrograph visual interpretation and statistical indicators. The performance was good for calibration and validation for both approaches with high R2 and Nash-Sutcliffe Efficiency (NSE). Also, the uncertainty was acceptable with P-factor >70% and R-factor <1. Differences in CN-SM and CN-ET\u27s conceptual structure have caused variations in the calibrated parameters\u27 best-fit value and their sensitivity to streamflow simulations, which implicated for other components\u27 output water regulation services. However, CN-ET approach was less responsive to area\u27s biophysical conditions for runoff generation than CN-SM one. This implicated that CN-ET generated low soil water storage and an overestimated actual evapotranspiration. This modeling exercise showed selection of a runoff CN approach by considering biophysical characteristics is important for calculating and simulating water balance component in such watershed. The accuracy of the simulation will significantly influence watershed management recommendations to improve water regulation\u27s sustainability
. 1096 Año 22 (2023) septiembre. El Tlacuache
No full textLas festividades dan cuenta de una diversidad de formas de relaciones sociales y de vinculación social con el territorio. Se ha destacado el papel que han tenido para generar momentos de convivencia y cooperación colectiva. Las personas brindan a la comunidad trabajo, dinero, productos y/o aportan capital social (es decir, facilitar algún trámite o el uso de algún espacio en la localidad).- Territorialidad y festividad. Celebración a Santo Domingo de Guzmán en Oaxtepec por Tania Alejandra Ramírez Rocha y Patricia Ramírez Ramírez.Jaripeo. Fotografía: Patricia Ramírez Ramírez, Oaxtepec, Morelos, 2023
El Tlacuache Núm. 921 (2020). 921 Año 19 (2020) febrero. El Tlacuache
No full textEl devenir de la infancia en México por Tania Alejandra Ramírez Rocha
El Tlacuache Núm. 926 (2020). 926 Año 19 (2020) marzo. El Tlacuache
No full text- La participación de la niñez en los huehuenches de Tlayacapan por Tania Ramírez Rocha y Patricia Ramírez Ramírez
Wind regimes above and below a dense oil palm canopy: Detection of decoupling and its implications on CO2 flux estimates
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