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首页> 外文会议>NATO Mediterranean Dialogue Workshop on Desertification in the Mediterranean Region. A Security Issue; 20031202-05; Valencia(ES) >LAND USE CHANGE DETECTION AS A BASIS FOR ANALYSING DESERTIFICATION PROCESSES: A CASE STUDY IN TABERNAS (ALMERIA, SPAIN)
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LAND USE CHANGE DETECTION AS A BASIS FOR ANALYSING DESERTIFICATION PROCESSES: A CASE STUDY IN TABERNAS (ALMERIA, SPAIN)

机译：土地利用变化检测作为沙漠化过程分析的基础：以塔贝拉纳斯为例（西班牙，阿尔梅里亚）

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摘要

This contribution proposes an integrated approach to detect and quantify land-use and land-cover changes as a basis for studying and predicting changes in environmental processes leading to desertification. The approach has been applied in Tabernas (Almeria, Southeast Spain), a representative area of the Mediterranean region where a combination of extreme environmental conditions and modifications of the land-use pattern that occurred in the last decades have led to increase the risk of desertification. The approach is based on multi temporal records of remotely sensed data and field survey. Sets of aerial photographs taken in the fifties (1956), the eighties (1981) and the nineties (1995) were used to map land use and cover in the three different periods of the last fifty years. The results indicate that from 1956 to 2000, atotal area of 5218 hectares of land was subjected to change in land use. The main land cover type that was subjected to change was dry farming. Throughout the past four and half decades 2507 hectares (32%) of dry farming has changed into different land use types, of which 1447.7 (57.7%) hectares changed to irrigated farmland, 857 (34%) became abandoned and about 202 (8.3%) were subjected to various activities (infrastructures, industries, etc.) that have left the area without a vegetation cover. The abandoned areas have evolved to areas with a weed type non-permanent bush cover, which is totally different from the natural cover in the region. The land abandonment and the change from dry fanning to irrigation seem to exert pressure on the environment, that can lead to an increase in desertification processes such as soil erosion, salinisation and pollution. Most of the recent irrigated farms are on slopes ranging in inclination from 2 to 8%. Important erosion processes can occur both on these slopes and on abandoned areas depending on other influencing factors (e.g., soil erodibility).
机译：该文稿提出了一种检测和量化土地利用和土地覆盖变化的综合方法，作为研究和预测导致荒漠化的环境过程变化的基础。该方法已在地中海地区的代表性地区塔贝纳斯（塔贝纳斯）（阿尔梅里亚，西班牙东南部）采用，近几十年来极端环境条件和土地利用方式的改变相结合，导致沙漠化的风险增加。该方法基于遥感数据的多时态记录和现场调查。在五十年代（1956年），八十年代（1981年）和九十年代（1995年）拍摄的航空照片集被用于绘制土地使用和覆盖范围，以描绘过去五十年的三个不同时期。结果表明，从1956年到2000年，共有5218公顷土地被改变了土地用途。发生变化的主要土地覆盖类型是旱作。在过去的四五年半中，2507公顷（32％）的旱作农业已改变为不同的土地利用类型，其中1447.7公顷（57.7％）的土地变为灌溉农田，857公顷（34％）的土地被废弃，约202公顷（8.3％） ）进行了各种活动（基础设施，行业等），这些活动使该区域没有植被覆盖。废弃地区已发展为杂草型非永久性灌木覆盖区，这与该地区的自然覆盖区完全不同。土地被遗弃以及从干耕到灌溉的转变似乎对环境造成了压力，这可能导致荒漠化进程的增加，例如水土流失，盐碱化和污染。最近的大多数灌溉农场的坡度为2％至8％。取决于其他影响因素（例如土壤易蚀性），重要的侵蚀过程可能会在这些坡度和废弃地区发生。

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