Stock and indices of carbon management under different soil use systems

IF 0.5 Q4 ENVIRONMENTAL SCIENCES
Diego Henrique de Oliveira Morais, C. A. D. Silva, Jean Sérgio Rosset, Paulo Guilherme da Silva Farias, C. D. Souza, Jefferson Matheus Barros Ozório, S. Castilho, L. M. Marra
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Abstract

The aim of this study was to evaluate the stock of total organic carbon (TOC) and to perform the physical-granulometric fractionation of soil organic matter (SOM) in different management systems (MS). Three MS and one reference area of Native Forest (NF) were studied, and the three systems were sugarcane (SC), permanent pasture (PP) and no-tillage system (NTS). Soil samples were collected in the 0–0.05, 0.05–0.10, 0.10–0.20-m layers. Soil density (Sd), TOC, stratification index (SI), carbon stock (StockC), variation in StockC (∆StockC), carbon content of particulate organic matter (C-POM) and mineral organic matter (C-MOM), carbon stock index (CSI), lability (L), lability index (LI), and carbon management index (CMI) were determined. The MS presented higher Sd than the NF area. The NF area had higher TOC contents in the first layers, reaching 25.40 g kg-1 in the 0–0.05-m layer, with the PP area having higher values than the NF in the 0.10–0.20-m layer. The NF area showed the highest levels of C-POM (15.25 g kg-1) and C-MOM (10.15 g kg-1) in the first layer. In the 0.10–0.20-m layer, the PP and NTS systems were superior to the others. Regarding the C-MOM content, SC and PP showed higher levels in the 0.10–0.20-m layer. The highest CMI values were observed in the NTS and PP areas in the 0.10–0.20-m layer. The MS increased the Sd and reduced the TOC levels. The different MS modified the POM fraction, and the MOM fraction was most impacted by the SC area. The lability of the SOM was altered by the MS in the most superficial layers.
不同土壤利用系统下碳管理的存量和指标
本研究的目的是评估总有机碳(TOC)的存量,并对不同管理系统(MS)中的土壤有机质(SOM)进行物理粒度分级。以甘蔗(SC)、永久牧场(PP)和免耕系统(NTS)为研究对象,对三个MS和一个参考区进行了研究。在0–0.05、0.05–0.10、0.10–0.20-m的土层中采集土壤样本。测定了土壤密度(Sd)、总有机碳(TOC)、分层指数(SI)、碳储量(StockC)、储量变化(∆StockC),颗粒有机物(C-POM)和矿物有机物(C-MOM)的碳含量,碳储量指数(CSI)、不稳定度(L)、不稳定性指数(LI)和碳管理指数(CMI)。MS表现出比NF区域更高的Sd。NF区域在第一层中的TOC含量较高,在0–0.05-m层中达到25.40 g kg-1,PP区域的值高于0.10–0.20-m层中的NF。NF区第一层的C-POM(15.25 g kg-1)和C-MOM(10.15 g kg-1)水平最高。在0.10–0.20-m层中,PP和NTS体系优于其他体系。关于C-MOM含量,SC和PP在0.10–0.20-m层中显示出更高的水平。在0.10–0.20-m层的NTS和PP区域观察到最高的CMI值。MS增加了Sd并降低了TOC水平。不同的MS改变了POM分数,并且MOM分数受SC区域的影响最大。在最浅的层中,SOM的不稳定性被MS改变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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