ABSTRACT

Intensive agricultural practices have resulted in progressive soil degradation, with consequences on soil ecosystem services. The inclusion of service crops is a promising alternative to support the sustainability of the agricultural system. The aim of this study was to analyze in a six-year field experiment the effect of Brachiaria brizantha (perennial tropical grass) and Zea mays as service crops in a degraded common bean monoculture system in northwest Argentina. After six years, service crop treatments revealed a significant increase in most physical, chemical and biological properties of the soil (enzyme activities, microbial biomass, respiration and glomalin-related soil protein), compared with common bean monoculture. Also, a lower disease incidence was observed under B. brizantha treatments, associated with increased populations of Trichoderma spp. and Gliocladium spp. The phospholipid fatty acid profiles detected higher values of total microbial biomass under service crops. Our results suggest that the inclusion of several cycles of B. brizantha constitutes a promising soil management for recovering degraded agroecosystems.

中文翻译：

---

服务作物通过改变常见的豆根际土壤微生物区系并减少土壤传播的真菌病来改善退化的单一栽培系统

摘要

集约化农业实践导致土壤逐步退化，对土壤生态系统服务产生影响。服务作物的纳入是支持农业系统可持续性的有前途的替代方法。这项研究的目的是在一项为期六年的田间试验中分析Brachiaria brizantha（多年生热带草）和Zea mays作为服务作物在阿根廷西北部退化的普通豆单一栽培系统中的作用。六年后，与普通豆类单一栽培相比，服务作物的处理显示土壤的大多数物理，化学和生物学特性（酶活性，微生物生物量，呼吸作用和与gloomalin相关的土壤蛋白质）显着增加。此外，在B. brizantha治疗，与木霉属物种的增加有关。和胶质金龟属。磷脂脂肪酸谱检测到服务性作物下总微生物生物量较高。我们的研究结果表明，包括几个周期的B. brizantha构成对恢复退化的农业生态系统有希望的土壤管理。