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Using remote sensing to assess impacts of land management policies in the Ordos rangelands in China

International Journal of Digital Earth 2013年第S2期6卷 81-102页

作者： Weicheng Wu Eddy De Pauw claudio zucca International Center for Agricultural Research in Dry Areas(ICARDA)/CGIAR AmmanJordan Pedology and Land Degradation Department of Agriculture and Desertification Research Group(NRD)University of Sassari07100 SassariItaly

Implementation of land management policies influences land use and hence causes environmental *** the Ordos rangelands in China as a case study,this paper explores the potential of remote sensing to assess in dryland areas the impacts of policies on the *** Landsat images of the period 19782010 were acquired and those corresponding to the starting dates of implementation of different policies were selected for land-cover change analysis;others were used to check the detected change and track the normalized difference vegetation index(NDVI)trajectory matched with time series of meteorological data for calibration of natural response of rangelands to *** results indicate that policy impacts are complex and include both positive and negative aspects depending on the locality in *** one hand,policies have aroused the enthusiasm of people in agricultural production and sandcontrol leading to the recovery of about 2618 km2 of desertified rangeland and sandy land,and economic growth,on the other hand,provoked vegetation degradation with an accumulated area of 2439 km2 when policies cannot reconcile the conflict between environmental protection and the interest of rural ***,degradation is not absolute and can be mitigated by the implementation of rational policies.

关键词： land use/cover change multi-temporal remote sensing human intervention spatial variability NDVI trajectory

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SPATIAL DISTRIBUTION AND MORPHOLOGICAL FEATURES OF GULLIES IN AN AGROPASTORAL AREA IN SARDINIA,ITALY

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International Journal of Sediment Research 2006年第2期21卷 132-144页

作者： claudio zucca Annalisa CANU Raniero DELLA PERUTA Nucleo Ricerca Desertificazione Università di Sassari Italy Dr. Post-Doc Researcher CNR-IBIMET Via Funtana di lu colbu 4/A 07100 Sassari Italy Dr. Senior Researcher Nucleo Ricerca Desertificazione Università di Sassari Italy Dr. Young Researcher

According to the United Nations Convention to Combat Desertification soil erosion is one of the main causes of desertification in the northern Mediterranean. Recently the role of channel erosion in sediment delivery has become better understood by experimental research. The aim of the present work is to set up a simplified experimental methodology to study the relations between gully erosion, land types, and land use. The experimental area (about 720 ha) is located in a hilly region threatened by desertification in central eastern Sardinia, Italy, and is characterised by uneven morphology with steep slopes, where agropastoral activities, particularly tillage with heavy machinery and overgrazing, are causing severe soil erosion and compromising agricultural productivity. Previous studies carried out in the same area highlighted the need to quantify and monitor soil erosion to be able to give management guidelines to decision makers and to farmers. In this study, carried out in May 2003, an inventory of gullies of the area was made through an integrated use of aerial photographs and field surveys. The degree of activity and morphological features of gullies were assessed in the field using simple criteria. The approach applied included the measurement of the position and shape of gully heads and their width and depth at specific points. Relations were studied among distribution, frequency, and morphological characteristics of gullies and geomorphological features and land use.

关键词： Gully erosion Land use Overgrazing Desertification

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