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标题：Soil Fertility in Two Shifting Cultivation Mayan Systems of Yucatan, Mexico
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作者：Jorge H. Ramírez-Silva ; Genovevo Ramírez-Jaramillo ; Mónica Guadalupe Lozano-Contreras 等
期刊名称：Open Access Library Journal
印刷版ISSN：2333-9705
电子版ISSN：2333-9721
出版年度：2021
卷号：8
期号：10
页码：1-18
DOI：10.4236/oalib.1107858
语种：English
出版社：Scientific Research Pub
摘要：The Slash and Burn (SB) System, practiced by the Mayan farmers of Yucatan, is one of the oldest forms of land use. After SB the soil is cultivated with corn by two or three consecutive years and then abandoned for a fallow period of 15 to 40 years to restore soil fertility when new vegetation is cut and burned again. There are contrasting points of view related to the advantages of SB on soil fertility. So, this work aimed to evaluate changes in the soil fertility of two Mayan farmers (Leoncio and Epitacio), practicing SB in five different agroecosystems of Yucatan, Mexico. Three soil subsamples, at 0 - 20 cm deep, were taken per each agroecosystem and mixed to form a composite sample to analyse: pH, Organic Matter (OM), Nitrogen (N) as Nitrates (N-NO3), Available Phosphorus (P), Potassium (K+), Calcium (Ca2+), Magnesium (Mg2+) and Zinc (Zn2+). There was a general trend to increase OM, N-NO3, P, K and Mg in SB of Leoncio but Zn decreased. In Epitacio’s OM, P and K increased with SB. Long fallow periods showed the lowest pH values while the highest ones in the SB showed the influence of ashes. All agroecosystems showed High and Very High contents of OM although the contents of N-NO3 and P were Low, except the Very High content of N-NO3 in the Agroecosystem 3 of Epitacio in the rendzic Leptosol (rz LP). In all agroecosystems K and Ca were High whilst Mg was Medium. The overall average Zn content in Leoncio’s was Lower (0.38 ppm) than Epitacio’s ecosystem (2.76 ppm). A rendzic Leptosol showed extreme higher contents of all nutrients than the red Cambisol.
关键词：NutrientsHeterogeneityCritical LevelsChac Lu’umPus Lu’um