本文關(guān)鍵詞：Chihuahuan沙漠南緣沙漠化進(jìn)展評(píng)價(jià)——以San Luis Potosi高原為例（英文）

  更多相關(guān)文章： Landsat NDVI-NDWI ST-IO desertification re-greening vegetation

【摘要】：The aim of this study is to establish if the San Luis Potosi Plateau(SLPP), which is part of the southern edge of the Chihuahuan Desert, is generating desertification processes, indicating a progression of the desert toward the central part of Mexico. Therefore, we analyzed the temporal evolution of four environmental indicators of desertification: Normalized Difference Vegetation Index(NDVI), Normalized Difference Water Index(NDWI), Iron Oxides Index(IO) and Surface Temperature(ST). Landsat TM images are used to cover a period from 1990 to 2011. A new equation of total balance is proposed to generate an image of the overall evolution of each factor which is applied to get a probability map of desertification. The evolution of NDVI, NDWI and IO shows a behavior almost stable over the time. In contrast, the ST shows a slight increase. The outcomes of this study confirm periods of vegetation re-greening and 8.80% of the SLPP has the highest probability to develop desertification. The most affected area is the portion west of the region, and the east and south are the least affected areas. The results suggest a slight advance of the desert, although most of the area doesn't have the necessary conditions to develop desertification.
【作者單位】： Facultad
【關(guān)鍵詞】： Landsat NDVI-NDWI ST-IO desertification re-greening vegetation
【基金】：Program for Professional Development of Professors(PRODEP)through the convention PROMEP/103.5/13/6575
【分類號(hào)】：X171.1
【正文快照】： 1 Introduction Argue that a region is developing desertification processes has a significant impact on the planning of land management policies.For that reason,it’s important to analyze if the region is showing signs of desertification.The clear identi

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