These transition zones have very fragile, delicately balanced ecosystems. Desert fringes are often a mosaic of microclimates. Small hollows support vegetation that picks up heat from the hot winds and protects the land from the prevailing winds. After rainfall the vegetated areas are distinctly cooler than the surroundings. In these marginal areas, human activity may stress the ecosystem beyond its tolerance limit, resulting in degradation of the land. By pounding the soil with their hooves, livestock compact the layer of earth beneath the soil, increase the proportion of fine material, and reduce the rate at which the soil filters downwards, thus encouraging erosion by wind and water. Grazing and the collection of firewood reduces or eliminates plants that help to bind the soil.
📝 题目要求
找出文本中的逻辑关系词,并写出对应的逻辑类型
找出文本中的逻辑关系词；并写出所对应的逻辑类型：
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✅ 参考答案与解析
and：并列 result in：因果 and：并列 thus：因果 and：并列 or：并列 and：并列（说明植物的其他功能） result in：因果（人类活动导致土地退化） and：并列（说明牲畜的其他功能） thus：因果（说明最终导致侵蚀现象） and：并列（和牲畜食草并列） or：并列（有时减少植物，有时会完全消除植物）