This research is conducted to determine and analyze carrying capacity of agricultural land of Sumatra Selatan in 2015 as well as to project it in 2030. The analysis is also carried out to describe the Optimum Population Number and Land Requirement per Hectare of each regency and municipality in 2030. The research method applied using quantitatively descriptive method in which the data is collected from secondary source such as Agricultural Ministry and Central Statistics Agency publication and supported by literature study. The result shows that Sumatra Selatan has high carrying capacity (τ > 1) in 2015 and 2030. It means that the province is capable of food self-sufficiency since the province is underpopulated. The projection indicates that there is decline of carrying capacity in 2030 occurring across the province. For example, Ogan Komering Ulu (OKU) Regency which previously has high carrying capacity, is predicted to have experience low carrying capacity.
Tambakbayan is one of the watersheds in Yogyakarta, Indonesia that is experiencing changes in land use. The research aims to analyze the distribution of intrinsic and specific groundwater vulnerability in the watershed that was influenced by land-use changes from 2006 to 2017. The data used are the RBI maps (containing topographic and land-use information, 2006 and 2017), SRTM imagery, rainfall recorded at the Kambil, Prumpung, Bronggang, Santan, Gemawang, and Karang Ploso stations (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017), soil map, and aquifer map. Land-use change was analyzed by comparing the RBI maps of 2006 and 2017; while the groundwater vulnerability was assessed with the Susceptibility Index a development of the DRASTIC method. The intrinsic groundwater vulnerability was generated based on physical conditions, including depth to the water table, aquifer media, groundwater recharge, and topography, while the specific groundwater vulnerability was a function of these attributes added with one anthropogenic parameter: land use. Then, all of these parameters were analyzed with a map overlay. The results showed two levels of intrinsic vulnerability: low (2.18% of the watershed area) and medium (97.8%); and three classes of specific vulnerability: low (0.02%), medium (5.06%), and high (94.92%) in 2006. From 2006 through 2017, the areal percentage of the medium vulnerability increased, while that of the high vulnerability decreased due to the conversion of agricultural land to a reservoir in 2009.
Water is a fundamental human need, and one of the sources constantly available in rainy and dry seasons is spring. The residents of Wanadadi Sub-district (Banjarnegara, Indonesia) rely on spring water as an alternative source, specifically to deal with water scarcity in dry seasons. This research was intended to investigate the potential of the springs based on their availability and quality to meet domestic water requirements. There has never been a study focusing on the springs in the sub-district; therefore, the results can give an overview of their potential and suitable conservation strategies. This research also enriches scientific knowledge of spring characteristics in structural depressions and hill slopes. Spring availability was determined by measuring the discharge of 34 springs and comparing the results with the total water needs. Spring water quality was identified by testing the water samples of eleven springs, each representing a village in the sub-district, and comparing the parameter values with the standards for sanitation and hygiene purposes issued in the Decree of the Minister of Health No. 32/2017. The results showed that based on water availability the springs in five villages have good potential. Meanwhile, in terms of quality the springs in all villages have very low potential.
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