mature 发表于 2025-3-21 17:31:15

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VAN 发表于 2025-3-21 20:26:13

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周兴旺 发表于 2025-3-22 04:00:22

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hidebound 发表于 2025-3-22 04:53:46

Accelerated Water Erosion in ORV-Use Areasena that man may regard as either benevolent or pernicious depending on the place and time. Erosion of upstream fertile lands, for example, leads to enrichment of the prolific Nile and Mesopotamian floodplains, nuturing the first agriculturalists (Moss and Walker, 1978). From another point of view,

我怕被刺穿 发表于 2025-3-22 08:58:13

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Malfunction 发表于 2025-3-22 14:35:09

Plant Ecology in Deserts: An Overviewhed for the southwestern deserts of North America. Because of the many similarities of the world’s deserts to those of the United States, consideration of the vegetation of the world’s deserts is also important to management of ORVs. The objective of this chapter is to give the reader an overview of

Malfunction 发表于 2025-3-22 20:59:35

The Effect of Vehicle Use on Desert Vegetationuggies, motorcycles, and four-wheel-drive vehicles into the desert by the thousands on weekends (Luckenbach, 1975) and this motorized use of the desert has greatly affected the vegetation (Vollmer et al., 1976; Wilshire et al., 1978a, b). The main recreational uses include: (1) motorcycle races, (2)

Urea508 发表于 2025-3-22 23:36:08

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变化 发表于 2025-3-23 03:19:31

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Atheroma 发表于 2025-3-23 05:52:47

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查看完整版本: Titlebook: Environmental Effects of Off-Road Vehicles; Impacts and Manageme Robert H. Webb,Howard G. Wilshire Book 1983 Springer-Verlag New York Inc.