柴石滩水库水质现状及趋势分析

用大量实测水质资料,全面分析了柴石滩水库坝前、中部及库尾不同水域的水质现状,分析了南盘江入库河流弹药库水质代表断面的水质现状及水质变化趋势,提出了水库水污染控制及水资源保护措施.     

阿尔山——柴河旅游区环境本底情况、主要污染物种类、排放水平及污染防治对策

文章根据柴河旅游区自然地理概况及环境质量现状调查以及一些现场调研。结合阿尔山市市区环境大气、哈拉哈河、绰尔河水质监测数据，对柴河旅游区污染物种类、排放进行全面详细分析。并提出了污染防治对策。     

Genotypic Differences in Effects of Cadmium Exposure on Plant Growth and Contents of Cadmium and Elements in 14 Cultivars of Bai Cai

Abstract

Fourteen cultivars of bai cai (Brassica campestris L. ssp. chinensis var. communis) were grown in the nutrient solutions containing 0–0.5 μg mL^?1 of cadmium (Cd) to investigate genotypic differences in the effects of Cd exposure on the plant growth and uptake and distribution of Cd in bai cai plants. The Cd exposure significantly reduced the dry and fresh weights of roots and shoots, the dry weight ratio of shoot/root (S/R), total biomass, and chlorophyll content (SPAD value). Cd concentrations in bai cai ranged from 13.3 to 74.9 μg g^?1 DW in shoots and from 163.1 to 574.7 μg g^?1 DW in roots under Cd exposure, respectively. The considerable genotypic differences of Cd concentrations and accumulations in both shoots and roots were observed among 14 bai cai cultivars. Moreover, Cd mainly accumulated in the roots. Cd also caused the changes of uptake and distribution of nutrients in bai cai and under the influence of cadmium, the concentration of potassium (K) decreased in shoot and increased in root. However, the concentrations of magnesium (Mg), phosphorus (P), manganese (Mn), boron (B), and iron (Fe) increased in shoots and decreased in roots. In addition, Cd exposure resulted in an increase in calcium (Ca), sulphur (S), and zinc (Zn) concentrations in both shoots and roots but had no significant effects on the whole uptake of the examined mineral nutrients except for S.     

Produced natures through the lens of biodiversity conservation and tourism: the Ponta Negra Caiçara in the Atlantic Forest Coast of Brazil

Understanding nature as an outcome of organising discourses generated through relative experiences of our surroundings has been the groundwork of a political ecology that deals with the distribution of environmental justice among people with different degrees of power. In this paper, we examine how the environmental legislation and the tourism industry have constructed the term Caiçara as a way to categorise the inhabitants of the Atlantic Forest Coast of Brazil, in ways that meet their goals, but in turn occludes the discourse of the Caiçara themselves. Ethnographic research conducted in Ponta Negra, a small coastal community located at the heart of the Juatinga Ecological Reserve (Paraty, Rio de Janeiro State), as well as a review of key legislation, management plans and tourism materials form the empirical basis of this research. First, we offer a critical examination of the historical origin of the term Caiçara. We then compare contradictory ideas of Caiçara produced by Brazilian environmental legislation and the tourism industry. While the environmental legislation has characterised the Caiçara as fallen angels who are no longer conservation allies, the tourism industry has profited by selling them as ecologically noble savages who still live in harmony with the environment. Our analysis shows how Ponta Negra people have become objects of powerful discourses of nature that hinder the recognition of their collective rights and weaken their position to negotiate for their own desires and aspirations related to their identity and livelihoods.