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首页> 外文期刊>Regional Environmental Change >Grazing, forest density, and carbon storage: towards a more sustainable land use in Caatinga dry forests of Brazil
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Grazing, forest density, and carbon storage: towards a more sustainable land use in Caatinga dry forests of Brazil

机译：放牧，森林密度和碳储量：在巴西Caatinga干旱森林中实现更可持续的土地利用

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Grazing is the main land use in semi-arid regions of the world, and sustainable management practices are urgently needed to prevent their degradation. However, how different grazing intensities affect forest density and ecosystem functions is often not sufficiently understood to allow for management adaptations that safeguard the ecosystems and their functions in the long run. We assessed the aboveground carbon stocks and plant densities along a grazing gradient in the semi-arid seasonally dry tropical forest of north-eastern Brazil (Caatinga). On 45 study plots, we analysed the aboveground carbon stocks of the vegetation and determined forest density and recruitment as well as the population structure of the most abundant tree species. Grazing intensity was accounted for based on the weight of livestock droppings and classified as low, intermediate, or high. Mean aboveground carbon stock was 15.74 ± 1.92 Mg ha_(−1)with trees and shrubs accounting for 89% of the total amount. Grazing at high intensities significantly reduced aboveground carbon stocks of herbs but not of other plant functional types. Instead, aboveground carbon stocks of trees and shrubs were negatively related to altitude above sea level, which is a proxy for reduced water availability along with lower anthropogenic impact. The population structure of the most common tree species was characterised by abundant recruitment, irrespective of grazing, whereas the recruitment of less frequent woody species was negatively affected by grazing. Overall, our data imply that grazing and forage management need to be adapted, including the reduction of free-roaming livestock and storage of fodder, to maintain carbon storage and forest density.
机译：放牧是世界半干旱地区的主要土地利用，迫切需要采取可持续管理措施以防止其退化。但是，人们常常不足以了解不同的放牧强度如何影响森林密度和生态系统功能，因此无法进行适应性管理，以长期维护生态系统及其功能。我们评估了巴西东北部（Caatinga）的半干旱季节性干燥热带森林中沿放牧梯度的地上碳储量和植物密度。在45个研究样地上，我们分析了植被的地上碳储量，并确定了森林密度和招聘以及最丰富的树种的种群结构。放牧强度是根据牲畜粪便的重量计算的，分为低，中或高。地上平均碳储量为15.74±1.92 Mg ha _（-1），其中乔木和灌木占总量的89％。高强度放牧可显着减少草药的地上碳储量，但不会减少其他植物功能类型的碳储量。取而代之的是，树木和灌木丛的地上碳储量与海拔高度呈负相关，这是水供应量减少以及人为影响降低的代表。最常见的树种的种群结构的特征是无论放牧如何，都有大量的征募，而放牧频率较低的木本物种的征募却受到负面影响。总体而言，我们的数据表明，需要对放牧和牧草管理进行调整，包括减少自由漫游的牲畜和饲料的储藏，以保持碳储量和森林密度。

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