Land use change (LUC) has important effects on the aboveground biota, mainly by altering richness and diversity, as well as ecosystem functioning. However, the effects of LUC on abiotic and biotic soil properties need to be assessed to determine recovery potential when the original vegetation is restored. The Los Tuxtlas tropical rain forest landscape in Veracruz, Mexico, offers a suitable framework for testing this. To assess the effect of LUC on the microbial community of this tropical rain forest landscape, we analyzed the whole-cell fatty acid profile of the microbial community and physicochemical properties of soils from four types of land use: crops, pastures, secondary forest, and primary tropical rain forest for the dry and rainy seasons. Regardless of season, the microbial data grouped according to land use. The composition of the microbial community was correlated with soil pH in the dry season, and with nitrate, soil organic matter, and available phosphorus concentration in the rainy season. Land use affects the abundance of the microbial community as a function of seasonal variation. In comparison with the microbial community in primary and secondary forest, that of crops and pastures was more greatly affected by seasonal variation. In fact, there were no significant differences between the primary forests or among secondary forests of different ages. These results may indicate a capacity for fast recovery (5 years or less) by the microbial community upon forest regeneration.

中文翻译：

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与墨西哥热带雨林土地利用变化相关的微生物群落丰度和组成的变化

土地利用变化 (LUC) 对地上生物群有重要影响，主要是通过改变丰富度和多样性以及生态系统功能。然而，需要评估 LUC 对非生物和生物土壤特性的影响，以确定恢复原始植被时的恢复潜力。墨西哥韦拉克鲁斯的 Los Tuxtlas 热带雨林景观提供了一个合适的框架来测试这一点。为了评估 LUC 对这一热带雨林景观微生物群落的影响，我们分析了微生物群落的全细胞脂肪酸谱和来自四种土地利用类型的土壤的理化特性：作物、牧场、次生林和旱季和雨季的主要热带雨林。无论季节如何，微生物数据都根据土地用途分组。微生物群落的组成在旱季与土壤pH值相关，在雨季与硝酸盐、土壤有机质和有效磷浓度相关。作为季节性变化的函数，土地利用影响微生物群落的丰度。与原生林和次生林微生物群落相比，农作物和牧草的微生物群落受季节变化的影响更大。事实上，原始林之间或不同年龄的次生林之间没有显着差异。这些结果可能表明森林再生后微生物群落具有快速恢复的能力（5 年或更短）。作为季节性变化的函数，土地利用影响微生物群落的丰度。与原生林和次生林微生物群落相比，农作物和牧草的微生物群落受季节变化的影响更大。事实上，原始林之间或不同年龄的次生林之间没有显着差异。这些结果可能表明森林再生后微生物群落具有快速恢复的能力（5 年或更短）。作为季节性变化的函数，土地利用影响微生物群落的丰度。与原生林和次生林微生物群落相比，农作物和牧草的微生物群落受季节变化的影响更大。事实上，原始林之间或不同年龄的次生林之间没有显着差异。这些结果可能表明森林再生后微生物群落具有快速恢复的能力（5 年或更短）。