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Abstrak :
The main effect of logging is to create an artificial disturbance regime resulting in canopy gaps and disturbance to soil, seedlings and the forest understory. The effects of logging on the physical environment of a lowland dipterocarp forest in Central Kalimantan are being investigated. A range of approaches are being applied to characterize these impacts. The effect of logging on cnopy cover, seedling density and soil disturbance are recorded to produce low resolution maps of the plots before and after logging. More detailed information about changes in canopy structure is determined using image analysis of hemispherical canopy photographs.

Abstrak :
Hutan kota di Jakarta memiliki peran penting dalam mengurangi dampak negatif pemanasan global dengan menyerap emisi gas karbon dioksida (CO2) atmosfer yang dihasilkan dari aktivitas antropogenik manusia dan menyimpannya di dalam tanah. Penelitian ini bertujuan untuk menganalisis dinamika fluks emisi CO2 tanah pada perbedaan persentase tutupan kanopi vegetasi di Ekosistem Hutan Kota Cijantung, Jakarta Timur dan menganalisis hubungan antara suhu udara, suhu tanah, kelembapan tanah, dan derajat keasaman (pH) tanah dengan fluks emisi CO2 tanah. Metode penelitian melibatkan penggunaan Chamber-Based untuk mengambil CO2 tanah, yang kemudian diukur menggunakan Gas Chromatograph Shimadzu 2014. Chamber ditempatkan pada tiga kondisi stasiun: tutupan kanopi vegetasi terbuka (0%–30%), setengah terbuka (31%–60%) dan tertutup (61%–100%). Pengukuran parameter lingkungan dilakukan untuk setiap lokasi pengambilan emisi CO2 tanah dan dianalisis korelasinya menggunakan Spearman-rho. Hasil penelitian menunjukkan rata-rata fluks emisi CO2 tanah di stasiun setengah terbuka (1,443–5,050 g CO2 m-2hari-1) lebih besar daripada stasiun terbuka (0,747–3,376 g CO2 m-2hari-1) dan tertutup (1,243–2,518 g CO2 m-2hari-1). Namun, ketika dianalisis menggunakan uji Kruskal-Wallis tidak terdapat perbedaan signifikan antara fluks emisi CO2 tanah terhadap persentase tutupan kanopi vegetasi (0%–30%), (31%–60%) dan (61%–100%). Terdapat hubungan antara suhu tanah (r = -0,263) dan pH tanah (r = 0,233) dengan fluks emisi CO2 tanah, sedangkan suhu udara (r = -0,082) dan kelembapan tanah (r = -0,195) tidak memiliki hubungan dengan fluks emisi CO2 tanah. Hasil ini menyoroti kompleksitas interaksi antara faktor-faktor lingkungan dan aliran emisi gas CO2 tanah di Hutan Kota. ......Urban forests in Jakarta play a crucial role in mitigating the negative impacts of global warming by absorbing atmospheric CO2 emissions from anthropogenic activities and storing them in the soil. This study aims to analyze the dynamics of soil CO2 emission fluxes based on varying percentages of canopy cover in the Cijantung Urban Forest Ecosystem, East Jakarta, and to examine the relationships between air temperature, soil temperature, soil moisture, and soil pH with soil CO2 emission fluxes. The research methodology involved using a Chamber-Based method to collect soil CO2, which was then measured using a Shimadzu 2014 Gas Chromatograph. Chambers were placed in three station conditions: open canopy cover (0%–30%), semi-open (31%–60%), and closed (61%–100%). Environmental parameters were measured at each CO2 emission sampling location, and their correlations were analyzed using Spearman-rho correlation analysis. The results showed that the average soil CO2 emission flux at the semi-open (1.443–5.050 g CO2 m-2day-1) was higher than at the open (0.747–3.376 g CO2 m-2day-1) and closed (1.243–2.518 g CO2 m-2day-1). However, the Kruskal-Wallis test revealed no significant differences between soil CO2 emission flux and vegetation canopy cover percentage (0%–30%), (31%–60%) and (61%–100%). Soil temperature (r = -0.263) and soil pH (r = 0.233) were related to soil CO2 emission flux, while air temperature (r = -0.082) and soil moisture (r = -0.195) were not. These results highlight the complexity of interactions between environmental factors and soil CO2 gas emission flows in Urban Forests

Abstrak :
Hutan Kota Ciganjur, Jakarta Selatan merupakan hutan kota yang dikelola oleh pemerintah daerah sebagai ruang terbuka hijau yang bermanfaat untuk lingkungan dan masyarakat. Penelitian ini bertujuan untuk menganalisis dinamika fluks emisi gas karbon dioksida tanah pada perbedaan persentase tutupan kanopi vegetasi di Ekosistem Hutan Kota Ciganjur dan menganalisis hubungan antara suhu tanah, suhu udara, kelembaban tanah, dan pH tanah dengan fluks emisi gas karbon dioksida tanah. Pengambilan sampel dilakukan pada bulan September-November 2023. Sampel gas karbon dioksida diambil menggunakan metode Chamber-based pada tiga stasiun dengan persentase tutupan kanopi vegetasi yang berbeda, yaitu stasiun tutupan terbuka T1 (0%-30%), stasiun tutupan sedang T2 (31%-60%), dan stasiun tutupan tertutup T3 (61%-100%). Sampel gas yang diperoleh dikirim ke Laboratorium GRK BSIP, Pati untuk diukur. Pengukuran parameter lingkungan dilakukan langsung dilapangan. Hasil emisi gas yang diperoleh pada masing-masing tutupan terbuka, sedang, dan tertutup adalah 6,87 g CO2/m-2 hari-1, 2,57 g CO2/m-2 hari-1, dan 3,21 g CO2/m-2 hari-1. Hasil dari analisis Kruskal-Wallis menunjukkan tidak terdapat perbedaan signifikan antara tutupan kanopi vegetasi berbeda dengan fluks emisi gas karbondioksida (H hitung = 1,921; x2 tabel = 5,991). Hal ini dikarenakan terdapat faktor lain seperti suhu dan tanah, kelembapan, dan pH tanah yang mempengaruhi. Hasil analisis korelasi Spearman-rho menunjukkan terdapat korelasi dengan arah positif pada suhu udara (r = 0,28) dan pH (r = 0,34) terhadap fluks emisi gas karbon dioksida. Sebaliknya, tidak terdapat korelasi antara suhu tanah (r = 0,16) dan kelembapan (r = -0,10) terhadap fluks emisi gas karbon dioksida (rho tabel = 0,226; signifikansi = 0,05). ......Ciganjur Urban Forest, South Jakarta is a urban forest managed by the local government as a green open space that is beneficial for the environment and society. The aims of this research were to to analyze the dynamics of soil carbon dioxide gas emission flux at different percentages of vegetation canopy cover in Ciganjur Urban Forest Ecosystem and analyze the relationship between soil temperature, air temperature, soil moisture and soil pH with soil carbon dioxide gas emission flux. Sampling was carried out in September-November 2023. Carbon dioxide gas samples were taken using the Chamber-Based method at three stations, namely open cover station T1 (0%-30%), medium cover T2 (31%-60%), and closed cover T3 (61%-100%). Environmental parameter measurements are carried out directly in the field. The gas emission results obtained for each open, medium and closed cover were 6,87 g CO2/m-2 day-1, 2,57 g CO2/m-2 day-1, and 3,21 g CO2/m-2 day-1. Results of Kruskal-Wallis analysis showed that there was no significant difference between different vegetation canopy cover and carbon dioxide gas emission flux (H calculated = 1,921; x2 table = 5.991). The differences are not significant because of the factors of air and soil temperature, moisture, and pH. Spearman-rho correlation analysis show a positive correlation between air temperature (r = 0,28) and pH (r = 0,34) on the carbon dioxide gas emission flux, but there is no correlation between soil temperature (r = 0,16) and moisture (r = -0,10) on carbon dioxide gas emission flux (rho table = 0,226; sig = 0,05).