牧场
环境科学
灌木
横断面
垃圾箱
土壤质量
农学
有机质
土壤有机质
植物凋落物
生态系统
植被(病理学)
土壤水分
生态学
土壤科学
农林复合经营
生物
病理
医学
作者
Mariela Lis Ambrosino,Yanina Alejandra Torres,Cinthia Tamara Lucero,Graciela Susana Lorda,Leticia Soledad Ithurrart,Juan Manuel Martínez,Lorena Vanesa Armando,Antonio Garayalde,Carlos Alberto Busso
摘要
Shrub cover in semiarid rangelands may induce changes in soil resources and ecosystem functioning. However, it is unknown the real influence that shrub vegetation has on soil quality in rangelands used for livestock purposes. We evaluated shrub cover effect on twelve chemical and biochemical parameters of soil quality. In a semiarid Monte rangeland of Argentina, 6 paddocks were selected and 10 m transects were placed in a patch with (Sh) and without shrubs (WSh). Then, sites with grasses (Sh-G and WSh-G), bare ground-litter (Sh-BL and WSh-BL) and under shrub cover (Sh-S) were selected. In spring 2017 and 2018, a composite soil sample (0-10 cm in depth) was taken at each site (n= 6). Sh-G and Sh-S sites presented high values of soil organic matter (SOM), soil organic nitrogen (SON), particulate organic matter (POM) and cellulase activity (CA); WSh-BL and Sh-BL sites were associated with lowest contents of these variables. For the rest soil quality parameters, the soil sampling sites showed similar values. These results show that woody presence should not be directly linked to soil quality loss. Although we did not detect a shrub effect in all parameters studied, in the context of appropriate grazing management, presence of plant species of different functional groups has a positive effect on organic matter and N content of soil closed to them. Moreover, in these sites, high POM values represent an important reservoir of potentially available nutrients, and promote CA necessary for fresh litter decomposition improving soil quality of semiarid rangelands. This article is protected by copyright. All rights reserved.
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