Analisis Struktur Vegetasi Pohon di Daerah Tangkapan Air di Berbagai Mata Air
| Main Authors: | Sancayaningsih, Retno Peni, Saputra, Alanindra, Zahra, Fatimatuz |
|---|---|
| Format: | Proceeding PeerReviewed application/pdf |
| Bahasa: | eng |
| Terbitan: |
, 2014
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/135102/1/Fullpaper.ICGRC2014.Retno.Peni.UGM-IND-pdf.pdf https://repository.ugm.ac.id/135102/ |
Daftar Isi:
- Abstract— Indonesia has abundant water resources, but the availability of water varies based on spacial and temporal conditions. Climate change, ecosystem destruction in the catchment area, poor water use system, and the increase of water consumption demands result a water crisis. The lack of maintenance, and the change of land cover or ecosystem in spring catchment area decreased water catchment capacity. This causes water-flood in the rainy season and drought in the dry season. Therefore it is necessary to conduct a water resource conservation, through an ecological study of tree structure analysis in catchment areas of some springs. This research aims to study the tree structure analysis [important value index and density] and to study the role of land cover to hold overland-flow in some spring catchment areas. The research was conducted from June to October 2013 in four spring catchment areas, these are Cokro and Umbul Nila springs in Klaten Regency, Mudal and Wonosadi springs in Gunungkidul Regency. The research procedure includes surveys, delineation of spring catchment area, analysis of vegetation index based on NDVI (Normalized Difference Vegetation Index), selection of the sampling units, ecological analysis of vegetation, and conduct study of overland-flow model. The research showed that spring catchment area from the widest are : Wonosadi, Cokro, Umbul Nila, and Mudal springs with area size of 1039.3 ha; 828.4 ha; 547.5 ha; and 39.4 ha respectively. The number of tree species in those four spring catchment areas from the highest number are 28, 16, 11, and 7 species, that belong to 14, 11, 10, and 5 families found in Wonosadi, Cokro, Umbul Nila, and Mudal springs respectively. The dominant species found in those correspond springs are: Cyathocalyx pruniferus, both Ficus benjamina and F. retusa, Samanea saman, and Gnetum gnemon. Land cover percentage based on NDVI values of high and very high categories in each spring catchment area of Wonosadi, Mudal, Cokro, and Umbul Nila springs are: 47.3 % and 51.4 %; 12.9 % and 87.1 %; 40.9 % and 40.9 %; and 44.7 % and 44.4 % respectively. Catchment area covered by grasses, herbs, and shrubs had capacity of water retention up to 81% compared to the land without vegetation with water retention of overland flow only 33 %. Keywords—vegetation analysis, overland flow, NDVI