Aquatic Gastropods as Mercury Indicatorsin the Pantanal of Poconé Region (Mato Grosso, Brasil)

Gold mining is the principal polluting activity in themunicipality of Poconé at the northern limit ofthe Pantanal of Mato Grosso, Brasil and ischaracterized by the inadequate use of mercury in thegold extraction process. A way to contribute to theassessment of the environmental impact of mercuryrelease in the Pantanal is to make use of bioaccumulation. Thus, determinations of total mercuryin 188 Gastropods of three different species were madein seven different sampling sites during the dry andwet periods. Increase of mercury levels in the snailswas restricted to the gold mining area and adjacentsedimentation areas. The largest mercuryconcentrations were found at the Tanque dos Padressite, reaching 2.04 g g^-1 in individuals ofPomacea scalaris. In the other sampling sites,molluscs collected in the Araras/Piuval Bay complex,a mercury retention area, showed the largest mercuryconcentration, reaching up to 1.12 g g^-1.     

藤牧一号苹果在贵州的栽培适应性观测

经10年试种栽培,结果表明:在贵州阴雨多湿、寡日照气候条件下,藤牧一号苹果表现幼树生长旺盛、结果早、果实品质优良,丰产、稳定、适应性强等特点,可在生产上推广应用。栽培中应结合贵州实际,注意采用园地选择、幼树拉枝开张角度、深翻改土增施有机肥料、疏花疏果等栽培管理措施,可获得较高的产量。     

藤牧一号苹果幼树早果丰产拉枝技术

总结了藤牧一号苹果幼树早果、丰产的拉枝技术,其要点是:改冬季拉枝为夏季拉枝,以夏季采果后的8-9月份拉枝更为理想;合理确定拉枝的角度和方向,一般以主枝60°、辅养枝80°～90°为宜,拉枝的方向应根据目标树形,以枝条上下错落、互不遮挡、分布均匀为宜;合理确定拉枝的年龄和部位,以树龄3～4年生、枝龄2～3年生为佳,拉枝的位置以被拉枝条长度的1/3～1/2处为适宜;及时处理拉枝后萌发的枝条.并提出了拉枝的注意事项.     

Debating the success of carbon-offsetting projects at sports mega-events. A case from the 2014 FIFA World Cup

Forests are seen as climate mitigation mechanisms by the United Nations Framework Convention on Climate Change. In addition, their importance in the sustainable development paradigm has been confirmed through their inclusion in the Sustainable Development Goals (SDGs). The SDGs are designed to provide a global orientation toward inclusive and sustainable development, yet their implementation presents new challenges for forestry practitioners. This paper uses an ethnographic case study to examine a forestry-based carbon-offsetting project in Mato Grosso, Brazil, and uses several SDGs to analyze the level of project success. The project was created to offset the emissions from the construction of the new football stadium built for the 2014 FIFA World Cup in Mato Grosso and, therefore, attracted international attention. The project provides analytical points for a discussion on how forestry-based carbon offsetting fits within the wider discussion on sustainable development and how the success of project outcomes can be influenced in several key areas.     

Size, species, and fire behavior predict tree and liana mortality from experimental burns in the Brazilian Amazon

Anthropogenic understory fires have affected large areas of tropical forest in recent decades, particularly during severe droughts. Yet, the mechanisms that control fire-induced mortality of tropical trees and lianas remain ambiguous due to the challenges associated with documenting mortality given variation in fire behavior and forest heterogeneity. In a seasonally dry Amazon forest, we conducted a burn experiment to quantify how increasing understory fires alter patterns of stem mortality. From 2004 to 2007, tree and liana mortality was measured in adjacent 50-ha plots that were intact (B0 - control), burned once (B1), and burned annually for 3 years (B3). After 3 years, cumulative tree and liana mortality (≥1 cm dbh) in the B1 (5.8% yr⁻¹) and B3 (7.0% yr⁻¹) plots significantly exceeded mortality in the control (3.2% yr⁻¹). However, these fire-induced mortality rates are substantially lower than those reported from more humid Amazonian forests. Small stems were highly vulnerable to fire-induced death, contrasting with drought-induced mortality (measured in other studies) that increases with tree size. For example, one low-intensity burn killed >50% of stems <10 cm within a year. Independent of stem size, species-specific mortality rates varied substantially from 0% to 17% yr⁻¹ in the control, 0% to 26% yr⁻¹ in B1, and 1% to 23% yr⁻¹ in B3, with several species displaying high variation in their vulnerability to fire-induced mortality. Protium guianense (Burseraceae) exhibited the highest fire-induced mortality rates in B1 and B3, which were 10- and 9-fold greater than the baseline rate. In contrast, Aspidosperma excelsum (Apocynaceae), appeared relatively unaffected by fire (0.3% to 1.0% mortality yr⁻¹ across plots), which may be explained by fenestration that protects the inner concave trunk portions from fire. For stems ≥10 cm, both char height (approximating fire intensity) and number of successive burns were significant predictors of fire-induced mortality, whereas only the number of consecutive annual burns was a strong predictor for stems <10 cm. Three years after the initial burn, 62 ± 26 Mg ha⁻¹ (s.e.) of live biomass, predominantly stems <30 cm, was transferred to the dead biomass pool, compared with 8 ± 3 Mg ha⁻¹ in the control. This biomass loss from fire represents ∼30% of this forest's aboveground live biomass (192 (±3) Mg ha⁻¹; >1 cm DBH). Although forest transition to savanna has been predicted based on future climate scenarios, our results indicate that wildfires from agricultural expansion pose a more immediate threat to the current carbon stocks in Amazonian forests.