Carbon and Nitrogen Stocks and Microbiological Activity Under Forest-Pasture System and Traditional Pasture in Pernambuco

Abstract An adequate amount of soil organic matter is considered essential for long-term sustainable agriculture, ensuring good productivity. Therefore, the present study quantified carbon and nitrogen stocks and microbiological activity in soil of three different areas: Forest-pasture System, Pasture System and preserved Caatinga - used as a reference of the experiment - located in a semi-arid region, in Watershed of Pajeú River, state of Pernambuco, Brazil. Eight trenches were opened in each system to collect soil samples at depths of 0 - 10, 20 - 30 and 50 - 60 cm, for chemical and microbiological analysis. In general, attributes of soil showed better results of land use in the following order: preserved Caatinga - Forest-pasture System - Pasture System.

摘要 适量的土壤有机质被视为长期可持续农业的必要条件，可保障良好的生产能力。据此，本研究针对位于巴西伯南布哥州佩热乌河（Pajeú River）流域半干旱区域的三类区域，量化其土壤中的碳氮储量与微生物活性：林牧系统（Forest-pasture System）、牧场系统（Pasture System），以及作为实验参照的保护型卡廷加植被（Caatinga）。每个系统均开挖8个土坑，分别在0~10 cm、20~30 cm及50~60 cm深度采集土壤样本，用于化学与微生物学分析。总体而言，不同土地利用方式下的土壤各项属性表现优劣依次为：保护型卡廷加植被（Caatinga）＞林牧系统（Forest-pasture System）＞牧场系统（Pasture System）。