de Oliveira Camila Paula, Francelino Márcio Rocha, Daher Mayara, de Araújo Emanuel José Gomes, de Souza Sanches Leonardo, de Andrade Kauanna Domingues Cabral, de Campos Júlia Santos Nunes
Departamento de Silvicultura, Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, BR 465 km 7, Seropédica, 23890-000, Brazil.
Pós-Graduação em Ciências Ambientais e Florestais, Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, BR 465 km 7, Seropédica, 23890-000, Brazil.
Carbon Balance Manag. 2019 May 4;14(1):5. doi: 10.1186/s13021-019-0121-0.
The Cerrado is the second largest biome in Brazil and the most biodiverse tropical savannah in the world and acts as a great sequester of atmospheric carbon. The lack of studies related to the quantification of its total biomass compromises the understanding of the dynamics of CO in this biome. Thus, it is relevant to develop studies aiming at obtaining accurate estimates of the carbon stock in the different phytophysiognomies that make the Cerrado, to include them in appropriate forest management models. Based on the hypothesis that the amount of carbon stored can vary according to the vegetation typology and vegetation compartments, the aerial stock of dry biomass and carbon were estimated in different compartments (arboreal, herbaceous-shrub and litter). The study was developed in open Brazilian savannah and soils on the sandstone and discussed the effect of fire on this phytophysiognomy. For the arboreal compartment were adjusted mathematical models to fit the biomass equations to estimate the individual stock of the trees in this compartment. The results of the stocks were discussed considering the effect of fire on the phytophysiognomy.
Based on the precision and extra distribution measures, the Schumacher-Hall (non-logarithmic) equation presented better results to estimate the individual biomass and carbon stocks of the open Brazilian savannah trees. The aboveground biomass was 12.88 Mg ha, corresponding to a total carbon stock of 5.91 Mg ha, where most of the stocks are in the herbaceous-shrub compartment (44%). The arboreal compartment accounts for the smallest part of the stocks, followed by the litter.
The observed values are in the interval verified for other areas of savannah studied in Brazil. The values verified for the open Brazilian savannah in sandy soils are at the lower limit of this range, due to the nutrient-poor nature of this type of soil. The distribution of stocks in the different compartments above the ground points to the fragility of this environment to the random fire effect, common in the region. That shows the need for conservation measures for vegetation maintenance and soil protection to preserve adequate nutrient cycling in the ecosystem.
塞拉多是巴西第二大生物群落区，也是世界上生物多样性最丰富的热带稀树草原，是大气碳的重要汇。缺乏关于其总生物量量化的研究，影响了对该生物群落区碳动态的理解。因此，开展相关研究以准确估算构成塞拉多的不同植物群落的碳储量，并将其纳入适当的森林管理模型，具有重要意义。基于碳储存量可能因植被类型和植被组成部分而异的假设，对不同组成部分（乔木、草本 - 灌木和凋落物）的地上干生物量和碳储量进行了估算。该研究在巴西开阔稀树草原的砂岩土壤上开展，并探讨了火灾对这种植物群落的影响。针对乔木组成部分，调整了数学模型以拟合生物量方程，从而估算该组成部分树木的个体储量。考虑到火灾对植物群落的影响，对储量结果进行了讨论。
基于精度和额外分布测量，舒马赫 - 霍尔（非对数）方程在估算巴西开阔稀树草原树木的个体生物量和碳储量方面表现出更好的结果。地上生物量为12.88 Mg/ha，对应总碳储量为5.91 Mg/ha，其中大部分储量存在于草本 - 灌木组成部分（44%）。乔木组成部分的储量占比最小，其次是凋落物。
观测值处于巴西其他研究稀树草原地区验证的区间内。在砂土上的巴西开阔稀树草原验证的值处于该范围的下限，这是由于这类土壤养分贫瘠的性质所致。地上不同组成部分的储量分布表明该环境对该地区常见的随机火灾影响较为脆弱。这表明需要采取保护措施来维护植被和保护土壤，以确保生态系统中充足的养分循环。
