Environment and agriculture in semi-arid Sandia basin of northeast Mexico during the late 20th - early 21st century drought

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-03-29 DOI:10.1016/j.jsames.2025.105506

Priyadarsi D. Roy , Logesh Natarajan , Lakshumanan Chokkalingam

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Abstract

Changes in land use and land cover (Lu/Lc) and vegetation health, in the sub-decadal scale, estimated the possible impact of late 20th - early 21st century regional drought on the environment and agriculture of Sandia Basin (ca.226 km²) at the semi-arid northeast Mexico. Satellite-based Landsat Thematic Mapper (TM) and Operational Land Imager (OLI) data were assessed for the pre-drought (1985 and 1990 CE), drought (1995 and 2000 CE) and post-drought (2005, 2010 and 2015 CE) conditions. Loss of land with shrub in almost one-third of the basin (ca. 84.3 km²), ca. 87 % reduction in the very-high vegetation (NDVI>0.6) coverage and almost 3-fold expansion of areas with no vegetation (NDVI<0.1) reflected environmental changes during the drought. Deterioration in vegetation health was also reflected by 3-fold increase in the very-high drought severity (VCI: 0–10). Drought-associated reduction in agricultural activity was marked by ca.68.5 % shrinkage of cropland and ca.42 % expansion of fallow land in 2000 CE imagery compared to the pre-drought. Drought culmination led to more than 2-fold expansion of cropland in 2005 CE imagery. However, the very-high drought severity withstanding more than half of the basin (113–128 km²), even during the post-drought phases, showed lack of environmental recovery and it was consistent with a tendency of below-average precipitation as well as anthropogenic Lu/Lc modifications.

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20世纪末至21世纪初干旱期间墨西哥东北部半干旱桑迪亚盆地的环境与农业

在亚年代际尺度上，土地利用和土地覆盖（Lu/Lc）及植被健康变化估算了20世纪末至21世纪初墨西哥东北部半干旱地区桑迪亚盆地（约226 km2）的环境和农业可能受到的影响。利用基于卫星的Landsat Thematic Mapper （TM）和Operational Land Imager （OLI）数据对干旱前（1985年和1990年）、干旱前（1995年和2000年）和干旱后（2005年、2010年和2015年）的条件进行了评估。流域近三分之一（约84.3平方公里）的灌木林地减少，极高植被覆盖面积（NDVI< 0.6）减少约87%，无植被覆盖面积（NDVI<0.1）扩大近3倍，反映了干旱期间的环境变化。植被健康的恶化还反映在干旱严重程度（VCI: 0-10）增加了3倍。与干旱前相比，2000年CE图像显示，与干旱相关的农业活动减少，耕地面积减少了约68.5%，休耕面积扩大了约42%。2005年的CE图像显示，干旱导致耕地面积扩大了两倍多。然而，即使在干旱后阶段，超过一半的流域（113 ~ 128 km2）仍处于非常严重的干旱状态，表明环境恢复不足，这与降水低于平均水平的趋势以及人为的Lu/Lc变化是一致的。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.