Geographia Technica, Vol 22, Issue 1, 2027, pp. 120-134
SPATIAL ASSESSMENT OF VEHICULAR CO₂ EMISSIONS, VEGETATION CARBON STOCK AND GREEN-CAMPUS POLICY PRIORITIES AT UNIVERSITAS NEGERI PADANG, INDONESIA
Eri BARLIAN 
, Dasman LANIN, Iswandi UMAR, Pudia M. INDIKA , Indra YUZANDI, Fadhilla OKTARI, Alya FARIANI , Serly Mutia SARI, Dewi Rahmadani SIREGAR , Agung Anugrah BARLIAN
ABSTRACT: Campus carbon management requires integrated assessment of mobility, Green Open Space (GOS), vegetation carbon assets, and institutional strategies within a defined spatial boundary. This study was conducted at the main campus of Universitas Negeri Padang (UNP), Indonesia. The objectives were to quantifies vehicle activity and associated CO₂ emission loads, inventories vegetation and estimates standing above-ground carbon stock, maps existing and potential GOS, and prioritises campus carbon-management strategies using Interpretive Structural Modelling (ISM) and Cross-Impact Matrix Multiplication Applied to Classification (MICMAC). Vehicle activity was recorded manually at four gates for five working days, while vegetation was assessed through a campus-wide tree census and non-destructive allometric estimation. Spatial mapping delineated existing and potential GOS. The survey recorded 19,921 vehicle entries, with motorcycles accounting for 86.9%. Annualised vehicular emissions were estimated at 1,993.8 tonnes CO₂ year⁻¹, with motorcycles contributing 68.5%. Existing GOS covered 10.58 ha, or 29.8% of the 35.51-ha campus, and 1,335 trees representing 31 species were recorded. Allometric estimation across 20 zones yielded 1,620.7 tonnes CO₂-eq of standing vegetation carbon stock, which was not subtracted from annual vehicular emissions because it represents an inventory-date stock rather than annual sequestration. ISM/MICMAC identified institutional commitment as the fundamental driver, followed by transport and land-based measures. The study provides an integrated spatial-environmental framework for campus carbon management while preserving the temporal distinction between annual emission flow and standing carbon stock.
Keywords: urban green space; university mobility; allometric biomass; spatial assessment; policy prioritisation; campus carbon management.
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