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Changes in ecosystem service values strongly influenced by human activities in contrasting agro-ecological environments

引用

Ecological Processes 2021年第1期10卷 691-708页

作者： Mulatu Liyew Berihun Atsushi Tsunekawa Nigussie Haregeweyn Mitsuru Tsubo Ayele Almaw Fenta Faculty of Civil and Water Resources Engineering Bahir Dar Institute of TechnologyBahir Dar UniversityP.O.Box 26Bahir DarEthiopia. Arid Land Research Center Tottori University1390 HamasakaTottori 680-0001Japan. International Platform for Dryland Research and Education Tottori University1390 HamasakaTottori 680-0001Japan.

Background:Evaluating the impacts of land-use/land-cover(LULC)changes on ecosystem service values(ESVs)is essential for sustainable use and management of *** this study,we evaluated the impact of human activity driven LULC changes on ESVs over the period 1982–2016/17 in contrasting agro-ecological environments:Guder(highland),Aba Gerima(midland),and Debatie(lowland)watersheds of the Upper Blue Nile basin,***:During the study period,the continuous expansion of cultivated land at the expense of natural vegetation(bushland,forest,and grazing land)severely reduced the total ESV by about US$58 thousand(35%)in Aba Gerima and US$31 thousand(29%)in Debatie *** contrast,the unprecedented expansion of plantations,mainly through the planting of Acacia decurrens,led,from 2006,to a ESV rebound by about US$71 thousand(54%)in Guder watershed,after it had decreased by about US$61 thousand(32%)between 1982 and *** reduction in natural forest area was the major contributor to the loss of total ESV in the study watersheds,ranging from US$31 thousand(63%)in Debatie to US$96.9 thousand(70%)in Guder between 1982 and 2016/*** an areaspecific basis,LULC changes reduced the average ESV from US$560 ha^(−1) year^(−1)(1982)in Guder to US$306 ha^(−1) year^(−1)(2017)in Debatie *** ESVs such as provisioning(mainly as food production)and regulating services(mainly as erosion control and climate regulation)accounted for most of the total ESVs estimated for the study ***:In most cases,the total and specific ESVs of the watersheds were negatively associated with the population growth,which in turn was positively associated with the expansion of cultivated land over the study *** Guder,however,ESVs were positively associated with population growth,especially after *** is mainly due to the expansion of Acacia decurrens *** results suggest,therefore,that future policy measures and directions should focus o

关键词： drought prone Agro-ecologies Land use/land cover Acacia decurrens Plantations Ecosystem services Farming practices Upper Blue Nile basin

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