手工艺品
发表于 2025-3-28 16:16:04
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粘
发表于 2025-3-28 20:42:53
Columbus’s Reference Line on Earthhe archeological and agricultural significance of ancient Maya raised-field systems in the tropical lowlands of southeastern Mexico (Matheny, 1976; Turner and Harrison, 1981) and the chinampa system in the Valley of Mexico (Coe, 1964; Armillas, 1971). Most of these formerly intensively cultivated ag
物种起源
发表于 2025-3-29 02:34:56
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土坯
发表于 2025-3-29 05:27:59
https://doi.org/10.1007/978-3-031-36255-2 ever growing-population. Earlier studies have reported that as much as a 15 to 20 year fallow period was required to return a two-year agricultural site to its original fertility. Data on biomass changes show rapid increases in early stages of succession (Ewel, 1971; Buschbacher and Uhl, 1987), dur
enumaerate
发表于 2025-3-29 11:01:09
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不能平静
发表于 2025-3-29 11:45:01
https://doi.org/10.1057/9780312299521l and subtropical regions of the world where farmers have long planted trees with other agricultural crops and incorporated animals to help provide for the basic needs of food, wood products, and fodder, and to help conserve and protect their often limited resources (Nair, 1983). In the past decade,
Confirm
发表于 2025-3-29 16:43:00
https://doi.org/10.1007/978-3-030-13807-3osystems. This is generally attributed to the role these trees play in controlling erosion, maintaining soil organic matter, improving nutrient cycling efficiency, and ameliorating microclimates (Steppler and Nair, 1987).
Exclaim
发表于 2025-3-29 21:28:14
Fatalism vs Free Will: Nihilism and Noir,ns of enhancing the productivity of commercial forest lands. Programs typically involve the selection and selective breeding of superior or “elite” trees, with the goal of amplifying desirable traits, such as rapid growth, good form, high wood density, and disease resistance, in the progeny. At pres
GEAR
发表于 2025-3-30 00:37:45
Fear and Fantasy: Women in Noir,4, 1975; Papendick, et al., 1976; Sanchez, 1976; Kass, 1978; Willey, 1979, 1979a, 1981; Lamberts, 1980; Beets, 1982; Steiner, 1984; Govinden et al., 1984; Francis, 1986; Vandermeer, 1988), and chronicle an immense quantity of research in all corners of the globe on an incredible diversity of crop co
erythema
发表于 2025-3-30 07:19:47
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