Recent deforestation causes rapid increase in river sediment load in the Colombian Andes

Restrepo, Juan D.; Kettner, Albert J.; Syvitski, James P. M.

doi:10.1016/j.ancene.2015.09.001

Cited by 124 publications

(124 citation statements)

References 77 publications

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“…Menurut Turner et al (2007) deforestasi merupakan kegiatan perubahan tutupan hutan menjadi bukan hutan yang berdampak pada penurunan fungsi ekosistem hutan. Restrepo et al (2015) menyatakan bahwa deforestasi meningkatkan sedimentasi dan erosi pada daerah aliran sungai Magdalena, Kolumbia. Deforestasi di Indonesia telah menjadi masalah nasional karena berdampak terhadap kondisi perekonomian nasional, kesejahteraan masyarakat dan ancaman keanekaragaman hayati yang terdapat dalam hutan (Nawir dan Rumboko, 2008).…”

Section: Pendahuluanunclassified

Spatial Modeling of Deforestation in Fmu of Poigar, North Sulawesi

Ahmad

Saleh

Rusolono

2016

JPKW

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ABSTRAKHutan merupakan bagian dari ekosistem yang menyediakan jasa lingkungan bagi satu kesatuan ekosistem. Penurunan fungsi hutan dalam suatu ekosistem terjadi salah satunya karena deforestasi. Penelitian ini bertujuan membangun model spasial deforetasi di KPHP Poigar. Metode analisis deforestasi yaitu dengan analisis perubahan tutupan hutan menjadi tutupan bukan hutan dengan teknik post classification comparison. Analisis faktor penyebab deforestasi dilakukan dengan pembangunan model spasial deforestasi menggunakan model regresi logistik biner. Hasil penelitian menunjukkan bahwa luas penurunan tutupan hutan akibat deforestasi pada periode 2000 sampai 2013 yakni 12.668,2 hektare. Penyebab deforestasi di KPHP Poigar dipengaruhi oleh enam faktor yaitu jarak dari jalan, jarak dari pemukiman, jarak dari sungai, kepadatan penduduk, ketinggian tempat dan kemiringan lereng. Model regresi logistik dibangun menggunakan lima peubah penjelas yaitu jarak dari jalan, jarak dari sungai, kepadatan penduduk, ketinggian tempat dan kemiringan lereng. Kemampuan model dalam memprediksi deforestasi sebesar 58 % dari kejadian deforestasi aktual, sehingga model spasial deforestasi dapat menjadi salah satu sumber informasi untuk penyusunan arah pengelolaan KPHP Poigar kedepan.Kata kunci: Deforestasi, model regresi logistik, pemodelan spasial, KPHP Poigar ABSTRACT Forest is a part of the ecosystem that provides environmental services. Deforestation may decrease forest function in an ecosystem. This study aims to build a spatial model of deforestation in a forest management unit (FMU) of Poigar. Deforestation analysis carried out by analyze the change of forest cover into non-forest cover with post classification comparison technique. Driving forces of deforestation carried out by spatial modeling using binary logistic regression models (LRM). Result of logistic regression model was used to predict the deforestation in 2013 and

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Section: Pendahuluanunclassified

Spatial Modeling of Deforestation in Fmu of Poigar, North Sulawesi

Ahmad

Saleh

Rusolono

2016

JPKW

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“…The hydrological response is diverse, as changes in vegetation affect various components of the hydrological cycle including evapotranspiration (Nosetto et al, 2005), infiltration (Molina et al, 2007), and surface runoff (Bathurst et al, 2011;Restrepo et al, 2015). The clearance of native forest for arable and grazing land induces rapid changes in soil physical properties reducing soil infiltration capacity (Bosch and Hewlett, 1982;Molina et al, 2007) and increasing surface runoff as a result of soil compaction and reduced evapotranspiration (Ruprecht and Schofield, 1989).…”

Section: A Molina Et Al: Multidecadal Change In Streamflow Associatmentioning

confidence: 99%

“…Andean headwater catchments are an important source of freshwater for downstream water users (Urrutia and Vuille, 2009;Roa-García et al, 2011). Although the ecosystems in the tropical Andes have been modified by anthropogenic disturbances for at least 7000 years (Bruhns, 1994), it is only since the early 20th century that natural habitats have undergone extensive transformation (White and Maldonado, 1991).…”

Section: Introductionmentioning

confidence: 99%

Multidecadal change in streamflow associated with anthropogenic disturbances in the tropical Andes

Molina

Vanacker

Brisson

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. Andean headwater catchments are an important source of freshwater for downstream water users. However, few long-term studies exist on the relative importance of climate change and direct anthropogenic perturbations on flow regimes in these catchments. In this paper, we assess change in streamflow based on long time series of hydrometeorological data and land cover reconstructions in the Pangor catchment (282 km 2 ) located in the tropical Andes. Three main land cover change trajectories can be distinguished during the period 1963-2009: (1) expansion of agricultural land by an area equal to 14% of the catchment area (or 39 km 2 ) in 46 years' time, (2) deforestation of native forests by 11 % (or −31 km 2 ) corresponding to a mean rate of 67 ha yr −1 , and (3) afforestation with exotic species in recent years by about 5 % (or 15 km 2 ). Over the time period 1963-2009, about 50 % of the 64 km 2 of native forests was cleared and converted to agricultural land. Given the strong temporal variability of precipitation and streamflow data related to El Niño-Southern Oscillation, we use empirical mode decomposition techniques to detrend the time series. The long-term increasing trend in rainfall is remarkably different from the observed changes in streamflow, which exhibit a decreasing trend. Hence, observed changes in streamflow are not the result of long-term change in precipitation but very likely result from anthropogenic disturbances associated with land cover change.

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“…; Butman et al ). Agricultural activity and/or removal of riparian vegetation may lead to higher inputs of moderately aged soil C to streams and rivers by destabilizing soils and accelerating erosion (Longworth et al ; Restrepo et al ). While global increases in watershed disturbance have been concentrated in developed countries, the intensity and timing of land use change has been highly variable across terrestrial regions (Goldewijk ; Vörösmarty et al ; Lambin and Meyfroidt ).…”

Section: Sources and Routes Of Input Of Aged C And Om To Inland Watermentioning

confidence: 99%

Nutritional support of inland aquatic food webs by aged carbon and organic matter

Bellamy

Bauer

2017

Limnol Oceanogr Letters

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Aged (typically tens to thousands of years old) forms of non-living carbon (C) and organic matter (OM) predominate in many inland water ecosystems. Advances in the methodologies used to measure natural abundance radiocarbon ( 14 C) have led to increased use of natural 14 C as both a source and age tracer in aquatic ecosystem and food web studies. Here, we review (1) D 14C values and ages of C and OM typically found in different inland water systems, (2) the mechanisms through which these materials enter inland water ecosystems, and (3) all available 14 C data on aquatic consumers across a range of inland water ecosystem types.

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Recent deforestation causes rapid increase in river sediment load in the Colombian Andes

Cited by 124 publications

References 77 publications

Spatial Modeling of Deforestation in Fmu of Poigar, North Sulawesi

Spatial Modeling of Deforestation in Fmu of Poigar, North Sulawesi

Multidecadal change in streamflow associated with anthropogenic disturbances in the tropical Andes

Nutritional support of inland aquatic food webs by aged carbon and organic matter

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