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All Journal Jurnal Teknik Pengairan: Journal of Water Resources Engineering Jurnal Pijar MIPA
Isoralla, Isoralla
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Biochemistry, Genetics & Molecular Biology Chemistry Engineering Mathematics Physics

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The Contribution of Tree Canopies to Microclimate in Urban and Karst Ecosystems in the Special Region of Yogyakarta Isoralla, Isoralla; Djohan, Tjut; Dzaky, Hazsriel Luthfi
Jurnal Pijar Mipa Vol. 20 No. 8 (2025): Special Issue
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v20i8.10816

Abstract

Canopy trees play an important role in regulating the microclimate in various ecosystems. This research aims to study the contribution of tree canopy to the microclimate in urban ecosystems and karst ecosystems in the Special Region of Yogyakarta. Trees can affect the microclimate around them, in this case, the ambient temperature. Currently, development in Yogyakarta continues to expand, and green open spaces are being increasingly eroded. The reduction of forest cover and green open spaces in Yogyakarta impacts both the macro and micro environments in the region. Therefore, this study examines the contribution of trees to the ecosystem in terms of air temperature at heights of 1 meter and 10 meters above ground level, soil temperature, air humidity, soil moisture, light intensity, pH, and wind speed in urban and karst ecosystems. This research was conducted at the end of the dry season, in mid-September, from 11:00 a.m. to 1:00 p.m. After the data was collected and tabulated into a collective table containing all the raw data, it was then calculated for its mean and standard deviation, and displayed in the form of a histogram. To determine the differences in parameters between each location, a Least Significant Difference (LSD) test was conducted. Based on the research conducted, both in urban and karst ecosystems, the air temperature 10 meters above the ground (the area around the tree canopy) was lower than the air temperature 1 meter above the ground. The difference in air temperature around the canopy and far from the tree canopy reached 4°C (℃ ) to 10°C (℃ ). Overall, the average air temperature in karst ecosystems was higher than in urban ecosystems. This is due to the differences in the shapes and structures of the tree canopies in the two ecosystems. Trees in urban ecosystems have more diverse shapes and are denser than trees in karst ecosystems. This study proves that trees contribute to the microclimate by lowering the temperature.
Seasonal Assessment of Musi River Water Quality in Palembang Using STORET and PI Faizaturrohmah, Nur; Sukmawardana, M. Iqbal; Noor Azizah, Rifka; Isoralla, Isoralla; Awfa, Dion; Rohman, Arif; Ulin Nuha, Muhammad; Try Atmojo, Aulia; Adli Naufal Purnomo, Daffa
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 17 No. 1 (2026)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2026.017.01.10

Abstract

This study aims to determine the water quality status of the Musi River in Palembang City in the dry season (July) and the rainy season (October) using the STORET and Pollution Index (PI) methods, as a scientific basis for evaluating seasonal pollution dynamics and supporting sustainable river management. Water samples were collected from four representative sampling sites along the Musi River in Palembang City, representing the upstream reach, industrial zone, urban reach, and downstream section. Primary data were obtained from field measurements of physical and chemical parameters, while secondary data were obtained from water quality standards and related literature. Water quality determination using the STORET method was based on deviations from regulatory standards, while the PI method estimated the average pollution load. The results show that several parameters exceed the allowed limits, with the STORET method generally classifying the river as moderately polluted, whereas the PI method classifies it as lightly polluted. This study evaluated the water quality of the Musi River in Palembang City using the STORET method and the Pollution Index at four sampling locations in the dry and rainy seasons. The STORET analysis showed that four points fell into the moderately polluted category (score: -12 to -20), while the PI method showed lightly polluted throughout the area (Pij score: 2.29 to 3.07). The results underscore the urgent need for integrated pollution management to ensure regulatory compliance and protect ecosystems.
Co-Authors Adli Naufal Purnomo, Daffa Arif Rohman Dion Awfa Djohan, Tjut Dzaky, Hazsriel Luthfi Faizaturrohmah, Nur Noor Azizah, Rifka Sukmawardana, M. Iqbal Try Atmojo, Aulia Ulin Nuha, Muhammad