Abstract

In the last decades, the studies involving the mechanisms of the CO₂ emissions dynamics have been studied in several ecosystems with varied soil classes. The objective of this study was to evaluate the relationship between physical and chemical attributes of soils and the variation of CO₂ efflux in Indian Black Earth (IBE) and non-anthropogenic soils in the Amazon. The study areas are located in the southern region of Amazonas, specifically in the municipalities of Humaitá and Apuí. Respectively in the natural field and forest areas, grids with dimensions of 70 m x 70 m and 10 m regular spacing between sample points, in the depth of 0.0–0.20 m, totaling 64 samples were delimited. In the IBE area, a 42 x 88 m grid was established, marking points at a 6 x 8 m spacing, totalizing 88 sampling points in the depth of 0.0–0.2 m. The soil physical analyzes performed were bulk density, soil penetration resistance, macroporosity, microporosity, total porosity and texture, and the soil chemical analyzes were composed by organic carbon, organic matter and carbon stocks. The soil CO₂ emission (FCO₂) was recorded with a portable automated LI-COR soil flow system (LI-8100). The soil temperature (Tsolo) was monitored concomitantly with the soil CO₂ emission evaluations using a temperature sensor that is an integral part of the LI-8100 system. Soil moisture was recorded using a Time Domain Reflectometry (TDR) apparatus - Campbel® Hydrosense ™ Campbell Scientific. The data were submitted to descriptive statistical analyzes and multiple linear regression with the pedotransfer functions model criterion. The study demonstrates the variation of physical and chemical attributes of the soil and its influence on CO₂ efflux variation, since the different environments studied presented differentiated scales and attributes for each situation, due to the correlations presented.

摘要

在过去的几十年中，涉及CO ₂排放动力学机制的研究已经在几种具有不同土壤类别的生态系统中进行了研究。这项研究的目的是评估土壤的理化属性与CO ₂变化之间的关系。在印度黑土（IBE）和亚马逊河非人为土壤中外排。研究区域位于亚马孙州的南部地区，特别是Humaitá和Apuí的直辖市。分别在自然田地和森林地区，网格尺寸为70 mx 70 m，采样点之间的规则间距为10 m，深度为0.0–0.20 m，共划定了64个样本。在IBE地区，建立了一个42 x 88 m的网格，以6 x 8 m的间距标记点，在0.0-0.2 m的深度中总共有88个采样点。进行的土壤物理分析为容重，抗土壤渗透性，大孔隙度，微孔隙度，总孔隙度和质地，土壤化学分析由有机碳，有机质和碳储量组成。土壤CO ₂排放量（FCO₂）用便携式自动LI-COR土壤流系统（LI-8100）记录。使用温度传感器（LI-8100系统不可或缺的一部分），与土壤CO ₂排放评估同时监测土壤温度（Tsolo）。使用时域反射仪（TDR）仪器-Camps®Hydrosense™Campbell Scientific记录土壤湿度。将数据提交到描述性统计分析和符合pedotransfer函数模型标准的多元线性回归。该研究证明了土壤的物理和化学属性的变化及其对CO ₂外排变化的影响，因为所研究的不同环境由于存在相关性而呈现出不同的规模和属性。