Herbicide residues in sediments from Lake St Lucia (iSimangaliso World Heritage Site, South Africa) and its catchment areas: Occurrence and ecological risk assessment

2020 ◽  
Vol 267 ◽  
pp. 115566
Author(s):  
Raymond Lubem Tyohemba ◽  
Letitia Pillay ◽  
Marc S. Humphries
2019 ◽  
Vol 11 (1) ◽  
pp. 327-340 ◽  
Author(s):  
Qin Liu ◽  
Zhaoping Yang ◽  
Hui Shi ◽  
Zhi Wang

Abstract Ecological risk assessment plays an important role in avoiding disasters and reducing losses. Natural world heritage site is the most precious natural assets on earth, yet few studies have assessed ecological risks from the perspective of world heritage conservation and management. A methodology for considering ecological threats and vulnerabilities and focusing on heritage value was introduced and discussed for the Bogda component of the Xinjiang Tianshan Natural World Heritage Site. Three important results are presented. (1) Criteria layers and ecological risk showed obvious spatial heterogeneity. Extremely high-risk and high-risk areas, accounting for 13.60% and 32.56%, respectively, were mainly gathered at Tianchi Lake and Bogda Glacier, whereas the extremely low-risk and low-risk areas, covering 1.33% and 17.51% of the site,were mainly distributed to the north and scattered around in the southwest montane region. (2) The level of risk was positively correlated with the type of risk, and as the level of risk increases, the types of risk increase. Only two risk types were observed in the extremely low-risk areas, whereas six risk types were observed in the high-risk areas and eight risk types were observed in the extremely high-risk areas. (3) From the perspective of risk probability and ecological damage, four risk management categories were proposed, and correlative strategies were proposed to reduce the possibility of ecological risk and to sustain or enhance heritage value.


2015 ◽  
Vol 49 (1) ◽  
Author(s):  
Barend J. De Klerk

Farm workers living in and around the Vredefort Dome World Heritage Site are some of the most vulnerable people in South Africa. Research by means of a case study with four participants from this group examined the following question: How do vulnerable people continue preaching the Word in this environment by ministering to other vulnerable people with the sermons that they have heard? The case study considered both the environment and the circumstances in which these participants live. This research aimed to establish what it means to preach to those who are vulnerable and how such preaching can be continued by the hearers. A case study by means of a qualitative empirical investigation called upon a few of the vulnerable hearers to speak.Thefindings included that the participants to this case study do not spread the sermons further on a regular basis, but they would be able to edify and encourage other vulnerable persons with it if needed. If they do talk to each other about the sermon directly after the worship service (like it was done during the interviews), their confidence to proclaim the message to other vulnerable people who do not participate in the worship services will increase. Plaaswerkers wat in die omgewing van die wêrelderfenisgebied, die Vredefortkoepel, woon, is van die mees weerlose wesens in Suid-Afrika. ’n Gevallestudie, waaraan vier van hierdie persone deelgeneem het, is gedoen. Dit het oor die volgende vraag gehandel: Hoe word preke wat aan weerloses bedien word deur hulle aan ander in hulle omgewing wat in dieselfde omstandighede verkeer, voortgedra? Die omgewing waarin die deelnemers woon en hulle lewensomstandighede is nagegaan. Daar is gepoog om vas te stel wat onder prediking aan weerloses verstaan word en hoe sodanige prediking deur die hoorders verder versprei kan word. Die gevallestudie, wat deur middel van ’n kwalitatiewe empiriese ondersoek plaasgevind het, het enkele van die weerlose hoorders self aan die woord laat kom. Die bevinding was dat die deelnemers hieraan nie die preke op ʼngereelde basis verder laat weerklink nie, maar dat hulle wel in staat sou wees om ander weerlose persone daarmee te versterk en te bemoedig. Indien hulle wel onmiddellik na die diens met mekaar oor die preek van die dag sou gesels (soos dit in die onderhoude gedoen is), kan die vrymoedigheid groei om die boodskap ook aan ander weerlose mense wat nie aan die erediens deelgeneem het nie, oor te dra.


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