18
37.500.000,-. Pendapatan petani dari penjualan jeruk dengan rumput gajah dengan rata-rata penghasilan 3 ton
per ha per tahun dengan harga jeruk Rp 12.500,- dan hasil penjualan dari rumput gajah rata-rata sebesar Rp.
1.000.000 per tahun maka pendapat petani seluruhnya Rp 38.500.000,-. Pendapatan petani menanam secara
tumpangsari maka hasil penjualan jeruk, rumput gajah dan bunga gumitir adalah sebesar Rp. 39.880.000,-,
pendapatan meningkat sebesar Rp 2.380.000 dari pendapatan Rp 37.500.000,- menjadi Rp 39.880.000,-
6. Penggunaan lahan tumpangsari secara ekonomi dan secara lingkungan memberikan dampak positif,
karena tingkat erosi dapat diminimalisir.
4.5 Temuan Penelitian Novelty
1. Perubahan pengunaan lahan semak menjadi hutan
sekunder peningkatan luas tutupan lahan 5 dapat menurunkan koefisien regim sungai 38.
2. Penggunaan lahan tumpangsari tanaman jeruk +
bunga gumitir + rumput gajah dapat menurunkan erosi sebesar 96 dan dapat meningkatkan
pendapatan petani Rp.2.380.000,00 per ha per tahun dibandingkan dengan penggunaan lahan kebun jeruk
V. SIMPULAN DAN SARAN
5.1 Simpulan
1. Koefisien regim sungai DAS Ayung adalah 3,2
dengan debit maksimum sebesar 9,37 m
3
det
-1
dan debit minimum sebesar 2,92 m
3
det
-1
. 2.
Erosi di DAS Ayung tergolong sangat ringan terdapat di bagian hilir 0,22-12,74 t ha
-1
th
-1
, erosi sangat ringan sampai sangat berat di bagian tengah
0,50-221,97 t ha
-1
th
-1
, erosi sangat ringan sampai sangat berat di bagian hulu 1,04-724,86 t ha
-1
th
-1
, melebihi erosi yang diperbolehkan Edp 22,60-
57,00 t ha
-1
th
-1
.
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3. Pendapatan petani di DAS Ayung bagian hulu adalah
Rp 165.987.641,- tertinggi sedangkan di bagian tengah dan bagian hilir adalah Rp 50.184.416,- dan
Rp 41.361.561,-
4. Perubahan penggunaan lahan semak menjadi hutan
sekunder peningkatan luas tutupan lahan 5 dapat menurunkan koefisien regim sungai 38.
5. Penggunaan
lahan tumpangsari
jeruk+bunga gumitir+rumput gajah dapat menurunkan erosi
sebesar 96 dan meningkatkan pendapatan petani sebesar Rp. 2.380.000 per ha per tahun dibandingkan
dengan penggunaan lahan jeruk.
5.2 Saran
1. Hasil simulasi dengan model SWAT dapat
digunakan sebagai salah satu pertimbangan dalam pengelolaan DAS kedepan.
2. Perlu
dilakukan penelitian
lanjutan dengan
menggunakan model SWAT pada DAS-DAS di Bali.
20
LAND USE PLANNING IN THE AYUNG WATERSHED
BALI PROVINCE
I. INTRODUCTION
1.1 Back Ground
Watershed is an expanse of territory or area bounded by limiting topography which receives,
collects rain water, sediments and nutrients as well as running it through creeks and rivers out to sea or lake.
Asdak, 2004; PP 372012. Damage often occurs in the watershed due to human intervention and the need to
increase, and the use of land that is not in accordance with the principles of soil and water conservation
Santoso, 2012.
According to Paimin et al. 2010 characteristics of the watershed is the basic foundation of the approach
in watershed management. Characterization system at the level of the watershed and sub-watershed give
information of degradation level to support watershed management planning or Sub-watershed a more
operational.
The administration of the Ayung watershed in the north tipped in Bangli, Badung, Buleleng and Tabanan,
Gianyar and Badung flows through and empties into the South in Denpasar City. Ayung watershed has an
important role that is the source of irrigation water in agriculture, raw water by Denpasar and Badung water
company PDAM to be processed into drinking water. Other activities that were found in the flow of Ayung
river is rafting are much in demand by domestic and foreign tourists. Ayung river also used by the people
closest to domestic needs such as bathing, washing and toilet facilities, for the benefit of social-religious
21
activities, melasti ceremonies, nganyut resulting in a conflict of interest in the utilization of water Ayung
river Bappeda Bali, 2002. Land use in the upstream of Ayung watersheds
dominated mixed farms, fields, shrubs untreated soil and water conservation as well. Such conditions can
lead to erosion and land degradation, which in turn lowers the productivity of the land. Ayung river
watersehd, especially in the central part of the district of Gianyar, along the banks of the river overlooking the
gorge built tourism support facilities such as hotels and restaurants should have conservation areas, while in the
lower part of the Ayung watersehed occurred dominant land conversion to settlements and tourism services.
The rate of land conversion occurs rapidly from farm to non farm, so that land cover reduced. The
downstream area of green open space for city area of green open RTHK is reduced, because it was built for
residential areas, especially the opening of Land Consolidation LC, and even in 2013 is estimated at
about 100 ha of paddy fields in Denpasar turned into LC Dinas Tata Ruang dan Perumahan, 2013.
Overcome issue mentioned, the necessary improvement of the condition of watersheds with soil
and water conservation, so that controlled reciprocal relationship the natural resources wand watershed
environment with human activities, so preservation of to the environment and human welfare.
1.2 Problem Formulation
