Rubina Karki, Sweta Dixit, S. K. Chaudhari, M. Dhamala, Sijar Bhatta, D. Khadka
The effect of invasive species on biodiversity is a major issue of world. This study was conducted at the Shivapuri Nagarjun National Park. This study assessed the invasive species status factor associated with it and their impact on seedling and sapling of trees. Modified Whittaker Nested sampling stratifies was adopted for vegetation sampling. A total of 15 plots were taken with 195 subplots between 1409 m to 2140 m. altitudinal ranges. A total of 32 tree species and nine invasive species were recorded from the studied sites. The pine forest was having significantly (W = 3, p = 0.03) more coverage of invasive species than mixed forest, the coverage of invasive species was also significantly (W = 50, p = 0.009) more with more invasive species than plot with single invasive types. Beside this coverage was also affected by canopy cover, trampling and altitude but not significantly different. The invasive species have impact on numbers of seedling, sapling and their diversity species coverage. We recommend removing these invasive species.
入侵物种对生物多样性的影响是一个世界性的重大问题。这项研究是在Shivapuri龙次郡国立公园进行的。本研究评估了与之相关的入侵物种状况因子及其对树木幼苗和幼树的影响。植被采样采用改进的Whittaker嵌套采样分层。在海拔1409 ~ 2140 m范围内共采集15个样地，195个子样地。研究地点共记录到32种乔木和9种入侵物种。松林的入侵物种盖度显著高于混交林(W = 3, p = 0.03)，入侵物种较多的样地的入侵物种盖度显著高于单一入侵类型样地(W = 50, p = 0.009)。此外，盖度也受冠层盖度、践踏度和海拔高度的影响，但差异不显著。入侵物种对苗木、树苗数量及其多样性、物种盖度均有影响。我们建议清除这些入侵物种。
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Eutrophication of wetlands has been considered as a global level environmental problem due to wide range of environmental impacts caused by it. All the lake bodies are subjected to natural eutrophication process but anthropogenic activities like excessive utilization of inorganic fertilizers containing phosphorus and nitrogen in the farmlands which ultimately reach to water bodies through runoff during rainfall further maximizes the eutrophication. The research was conducted to find the trophic state of Lake Phewa, Lake Begnas and Lake Rupa which are three major lakes of Lake Clusters of Pokhara Valley, a Ramsar listed wetland from mid-hills of Nepal. Trophic state of lakes were classified on the basis of Carlson’s Trophic State Index. This index was calculated with the measurement of Secchi depth, Chlorophyll-a, and Total Phosphorus using standard methods. Study revealed that all three lakes were mesotrophic in both pre-monsoon and monsoon season. Lake Rupa had the highest Carlson Trophic State Index (CTSI) and Lake Begnas had lowest CTSI in both the season. Development of lake from oligotrophic to eutrophic state is a natural and gradual process and hence these lakes have increased chances of being eutrophic naturally along with natural process being crucially altered by cultural eutrophication which shortens the life expectancy of the affected aquatic body. Suitable conservation measures are needed to reduce organic load from lake to prevent from being further degraded.
{"title":"Carlson's Trophic State Index for the Assessment of Trophic state of Phewa, Begnas and Rupa Lakes in Kaski district, Nepal","authors":"S. Shrestha, R. Malla","doi":"10.3126/jes.v8i1.53651","DOIUrl":"https://doi.org/10.3126/jes.v8i1.53651","url":null,"abstract":"Eutrophication of wetlands has been considered as a global level environmental problem due to wide range of environmental impacts caused by it. All the lake bodies are subjected to natural eutrophication process but anthropogenic activities like excessive utilization of inorganic fertilizers containing phosphorus and nitrogen in the farmlands which ultimately reach to water bodies through runoff during rainfall further maximizes the eutrophication. The research was conducted to find the trophic state of Lake Phewa, Lake Begnas and Lake Rupa which are three major lakes of Lake Clusters of Pokhara Valley, a Ramsar listed wetland from mid-hills of Nepal. Trophic state of lakes were classified on the basis of Carlson’s Trophic State Index. This index was calculated with the measurement of Secchi depth, Chlorophyll-a, and Total Phosphorus using standard methods. Study revealed that all three lakes were mesotrophic in both pre-monsoon and monsoon season. Lake Rupa had the highest Carlson Trophic State Index (CTSI) and Lake Begnas had lowest CTSI in both the season. Development of lake from oligotrophic to eutrophic state is a natural and gradual process and hence these lakes have increased chances of being eutrophic naturally along with natural process being crucially altered by cultural eutrophication which shortens the life expectancy of the affected aquatic body. Suitable conservation measures are needed to reduce organic load from lake to prevent from being further degraded.","PeriodicalId":87298,"journal":{"name":"Journal of environment and health sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87612799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Epidemiology------Comparison between indoor and outdoor air quality at three representative sites in Auckland Center Author: Liu Huan (1983-), Master of Science (First Class Honours), The University of Auckland. Advisor: Jennifer Salmond, School of Environment, Faculty of Science, The University of Auckland.
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Pub Date : 2021-08-14DOI: 10.15436/2378-6841.21.3805
S. Coughlin
Recent research supports the premise of studying social determinants of health in conjunction with cancer survivorship (Hastert TA, 2021). It is widely appreciated that the social context in which people live and work influences their health (Coughlin SS, 2019).The World Health Organization defined the social determinants of health as the “conditions in which people are born, grow, work, live and age, and the wider set of forces and systems shaping the conditions of daily life” (WHO, 2014).
最近的研究支持将健康的社会决定因素与癌症存活率结合起来进行研究的前提(Hastert TA, 2021年)。人们普遍认为，人们生活和工作的社会背景会影响他们的健康(Coughlin SS, 2019)。世界卫生组织将健康的社会决定因素定义为“人们出生、成长、工作、生活和衰老的条件，以及形成日常生活条件的一系列更广泛的力量和制度”(世卫组织，2014年)。
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Article 4: A Methodology of Assessing Spatial and Functional Heterogeneity in A Ecosystem / 生态系统的空间和功能异质性评价方法研究 Author: Liu Huan, Master of Science (First Class Honours), The University of Auckland
第4篇:生态系统空间和功能异质性评估方法作者:刘欢，奥克兰大学理学硕士(一等荣誉)
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Article 5. Daily Notes on Natural Conservation Author: Liu Huan (1983-), Master of Science (First Class Honours), The University of Auckland.
第5条。《自然保护日报》作者：刘欢（1983-），奥克兰大学理学硕士（一级荣誉）。
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Article 6. Modeling of annual net primary production of a forest in the Taramakau Valley, Westland, New Zealand Author: Liu Huan (1983-), Master of Science (First Class Honours), The University of Auckland Advisor: George Perry, School of Environment, The University of Auckland
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Article 3: 3S Technology Application on Biodiversity Monitoring and Assessment/3S 技术在生物多样性监测与评价领域的应用研究（英文） Author: Liu Huan, Master of Science (First Class Honours), The University of Auckland
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Article 7: Biodiversity Conservation & Management Studies in New Zealand Author: Liu Huan(1983-), Master of Science (First Class Honours), The University of Auckland.
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Article 2. Epidemiology: Environmental & Health Standards of Electromagnetic Wave/电磁波污染的环境与卫生标准 Author: Liu Huan(1983- ), Master of Science (First Class Honours), The University of Auckland.
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