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Length-Weight Relationship and Condition Factor of Porogobius schlegelii and Bathygobius soporator from Buguma Creek, Rivers State, Nigeria 尼日利亚河州布古马河施莱格氏虾和深虾的长权关系及条件因子
Pub Date : 2023-08-28 DOI: 10.56557/joban/2023/v15i28358
Abu, O. M. G., Lazarus, O. T., Nwalewe, R. T.
The present study investigated the length-weight relationship and condition factor of two fish species Bathygobius soporator and Porogobius schlegelii, in Buguma Creek. Over a three-month period (March – May 2018), 2000 different size fish samples each of B. soporator (1000) and P. schlegelii (1000) were collected by artisanal fishermen in Buguma Creek. The study collected total length and total weight data using a meter ruler and a digitally sensitive scale (Sartorius Model H987) for each species allowing determination of the growth exponent(b), coefficient of determination (r2) and mean condition factor values for the fish species. The study found that B. soporator ranged in total length from 7.00 to 18.80cm and from 2.00 to 14.70g, while P. shlegelli measured 4.50 to 11.50cm and weighed 1.30 to 7.10g. The growth exponent (b) ranged from 1.77 to 2.64 for B. soporator and 1.26 to 2.41 for P. schlegelli, indicating a negative allometric growth pattern for the two species, while the r2 values for B. soporator ranged between 0.61 and 0.89 and for P. schlegelli between 0.52 and 0.81 in Buguma Creek. The mean condition factor values for B. soporator ranged from 0.88 to 1.51, while for P. schlegelli it ranged from 0.38 to 0.39, suggesting that B. soporator had a higher condition factor than P. schlegelli, indicating better health and body condition for B. soporator and raising concern for the health of the P. schlegelli population in Buguma Creek. There is therefore an urgent need to establish conservation areas or fishing restrictions to allow the P. schlegelli fish population to recover and maintain a healthy population of the creek.
本文研究了布古马河两种鱼类的长重关系和条件因子。在三个月的时间里(2018年3月至5月),手工渔民在Buguma Creek收集了2000种不同大小的鱼样本,分别为soporator(1000)和schlegelii(1000)。研究使用米尺和数字敏感秤(Sartorius Model H987)收集了每个鱼种的总长度和总重量数据,从而确定了鱼种的生长指数(b)、决定系数(r2)和平均条件因子值。研究发现,soporator的体长在7.00 ~ 18.80cm之间,体重在2.00 ~ 14.70g之间,而shlegelli的体长在4.50 ~ 11.50cm之间,体重在1.30 ~ 7.10g之间。在布古马河,两种昆虫的生长指数(b)分别为1.77 ~ 2.64和1.26 ~ 2.41,均为负异速生长模式;而在布古马河,两种昆虫的生长指数r2分别为0.61 ~ 0.89和0.52 ~ 0.81。平均条件因子值为0.88 ~ 1.51,施莱格氏小蠊为0.38 ~ 0.39,说明施莱格氏小蠊的条件因子高于施莱格氏小蠊,说明施莱格氏小蠊的健康和身体状况较好,值得关注布古马河施莱格氏小蠊种群的健康状况。因此,迫切需要建立保护区或限制捕捞,以使施莱格里鱼种群恢复并保持健康的种群数量。
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引用次数: 0
Determination of Bacterial Quality of Indoor Air of Health Centers around Georgetown 乔治城周边卫生中心室内空气细菌质量测定
Pub Date : 2023-07-26 DOI: 10.56557/joban/2023/v15i28323
Shamar Glasgow, R. Daniel, L. Kalicharan
Health centers around Georgetown, Guyana, are bisected with myriads of problems such as inadequate sanitation protocols and physical and environmental factors that contribute to the rise of nosocomial infections. The aim of this study was to conduct a bacteriological assessment of indoor air in three health centers around Georgetown, Guyana. This research was conducted under a cross-sectional study design for a period of one month. Nutrient agar plates were exposed for 30 minutes twice a day over three days. Subsequently, plates were incubated at 37℃ for 24-48 hours, and the number and types of bacteria were determined. The average bacterial load during the morning was 2226.33 cfu/ m3 and 2032.33 cfu/m3 in the afternoon at health center 1. At health center 2, the average bacterial load was 859 cfu/ m3 in the morning and 755.75 cfu/ m3 in the afternoon. At Health Center 3, the bacterial averages were 807.67 cfu/ m3 and 1317.59 cfu/ m3 for morning and afternoon sampling times, respectively. Isolated bacteria were identified by morphological characteristics, gram staining and biochemical tests were also carried out. The bacterial isolates included Escherichia coli, Serratia marcescens, Micrococcus spp., Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, Streptococcus spp., Proteus spp., Pseudomonas aeruginosa, and Enterobacter aerogenes. Favorable conditions and environmental factors for the growth and multiplication of bacterial microbes in the air, like ventilation, lower temperature, poor sanitation, sanitation, attached toilets, and frequency of persons present, were observed during the survey. The findings contribute to an array of nosocomial infections that can be detrimental in severe cases.
圭亚那乔治敦周围的卫生中心被无数的问题一分为二,如卫生规程不足以及导致医院感染增加的物理和环境因素。这项研究的目的是对圭亚那乔治敦周围三个卫生中心的室内空气进行细菌评估。本研究采用横断面研究设计,为期一个月。营养琼脂平板暴露30分钟,每天两次,为期三天。随后,将平板在37℃下孵育24-48小时,并测定细菌的数量和类型。1号卫生中心上午的平均细菌载量为2226.33 cfu/m3,下午为2032.33 cfu/m3。在2号卫生中心,上午的平均细菌载量为859 cfu/m3,下午为755.75 cfu/m3。在3号卫生中心,上午和下午采样时间的细菌平均数分别为807.67 cfu/m3和1317.59 cfu/m3。通过形态学特征、革兰氏染色和生化测试对分离的细菌进行鉴定。分离的细菌包括大肠杆菌、粘质沙雷氏菌、微球菌、枯草芽孢杆菌、蜡样芽孢杆菌、金黄色葡萄球菌、链球菌、变形杆菌、铜绿假单胞菌和产气肠杆菌。在调查期间,观察到空气中细菌微生物生长和繁殖的有利条件和环境因素,如通风、低温、卫生条件差、卫生设施、附厕所和在场人员的频率。这些发现导致了一系列医院感染,在严重病例中可能是有害的。
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引用次数: 0
The Acute Toxicity of Fenvalerate on the Larval Stage of the Mediterranean Flour Moth, Ephestia kuehniella (Lepidoptera: Pyralidae) 氰戊菊酯对地中海粉蛾幼虫期的急性毒性研究
Pub Date : 2023-07-20 DOI: 10.56557/joban/2023/v15i28317
Mohammad Asadi
The Mediterranean flour moth or mill moth (Ephestia kuehniella Zeller) from the family Pyralidae is a common pest of cereal grains, especially flour. This moth is found throughout the world, especially in countries with temperate climates. Fenvalerate is a synthetic pyrethroid insecticide which is a mixture of four optical isomers with different insecticidal activities. In this research, the acute toxicity of this insecticide was investigated on the larval stage of E. kuehniella during 24h and 48h, in two replications. Accordingly, the LC30 in 24h and 48h were determined as 389.67 and 271.30 mg.a.i/ L. During these times, LC50 values being 690.71 and 502.91 mg.a.i/ L, respectively. Finally, LC90 was determined as 2797.94 and 2272.71 mg.a.i/ L for 24h and 48h. The results showed that this insecticide has suitable toxicity on this pest and can be recommended against it.
地中海粉蛾或磨蛾(eephestia kuehniella Zeller)是一种常见的谷物害虫,特别是面粉。这种蛾在世界各地都有发现,特别是在温带气候的国家。氰戊菊酯是一种合成的拟除虫菊酯类杀虫剂,由四种不同杀虫活性的光学异构体混合而成。本研究分2个重复,对该杀虫剂在库氏杆菌幼虫期24h和48h的急性毒性进行了研究。据此测定24h和48h LC30分别为389.67和271.30 mg.a。在此期间,LC50分别为690.71和502.91 mg.a。分别为i/ L。最后测定LC90分别为2797.94和2272.71 mg.a。i/ L为24h和48h。结果表明,该杀虫剂对该害虫具有适宜的毒力,可推荐使用。
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引用次数: 0
Floral Nectar Production of Jaltomata grandiflora, a Rare Mexican Nightshade 一种稀有的墨西哥龙葵——桔梗花的花蜜生产
Pub Date : 2023-06-08 DOI: 10.56557/joban/2023/v15i28263
T. Mione, Jillian P. Dow
Understanding morphological, phenological, or chemical characters that promote reproduction, or limit it, is particularly important for rare plants. Jaltomata grandiflora is a rare member of the nightshade family (Solanaceae) from Mexico. In floral nectar, the mean cumulative sugar content per flower was 0.9 mg during the pistillate phase (day 1) and was significantly higher (1.25 mg) during the hermaphroditic phase (day 2). The mean cumulative nectar volume per flower was 0.99 µL during the pistillate phase and was higher (1.36 µL) but not significantly higher during the hermaphroditic phase. The mean sugar concentration (oBrix) was 67.8 during the pistillate phase and slightly higher (70.3) but not significantly higher during the hermaphroditic phase.
了解促进或限制繁殖的形态、物候或化学特征,对稀有植物尤为重要。大花椒是墨西哥茄科(茄科)的一种稀有植物。在花蜜中,雌蕊期(第1天)平均每朵花的累积含糖量为0.9 mg,雌雄同体期(第2天)平均每朵花的累积含糖量显著增加(1.25 mg)。雌蕊期平均每朵花的累积含糖量为0.99µL,雌雄同体期平均每朵花的累积含糖量较高(1.36µL),但不显著高于雌蕊期(1.36µL)。雌蕊期平均糖浓度(oBrix)为67.8,雌雄同体期略高(70.3),雌雄同体期无显著升高。
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引用次数: 0
Effect of Flour Addition Carrot, Spirulina, and Pumpkin Infeed on Color Brightness and Performance Growth of Koi Fish Seeds (Cyprinus carpio) 面粉添加、胡萝卜、螺旋藻和南瓜饲料对锦鲤种子色泽和生产性能生长的影响
Pub Date : 2023-06-08 DOI: 10.56557/joban/2023/v15i28267
Muchammad Islachuddin, D. Chilmawati, I. Samidjan
Koi Fish (Cyprinus carpio) is an attractive and relatively expensive ornamental fish because of its color, but fish cannot synthesize their own pigment colors except for black and white, so they need feed ingredients containing β-carotene (such as carrots, spirulina, and pumpkin). This study aims to determine the effect of adding carrot, spirulina, and pumpkin flour types to feed on the color brightness and growth performance of koi fish seeds. The study used an experimental method with a completely randomized design (CRD) consisting of 4 treatments and 3 replications: treatment A (without adding flour), treatment B (5% carrot flour), treatment C (1% spirulina flour), and treatment D (pumpkin flour). yellow 15%). Kohaku type koi seeds measure 7.18 ± 0.58 cm. Variables considered included total feed consumption, color values, number of chromatophore cells, relative growth rate (RGR), absolute length growth, survival recovery, and air quality. The results showed that the bes treatment was 5% carrot flour with a TKP value of (38.44 ± 1.02) grams, the difference in hue values (2.5 ± 0.05), the number of chromatophores (776), the difference in colour values (2.5 ± 0.05), the number of chromatophores (776±38.08) cells, relative growth (RGR) of (1.02±0.76)%/day, and absolute length of growth (0.99 ± 0.07) cm. The water quality results obtained were temperatures ranging from 25.9-27.9oC, pH 8.0-8.5 and DO 5.4-8.0 mg/L. Concluded that the addition of carrot, spirulina and pumpkin flour to the feed had a significant effect on the brightness of the color of koi fish, but had no significant effect on growth performance.
锦鲤(Cyprinus carpio)因其颜色而成为一种有吸引力且价格相对昂贵的观赏鱼,但鱼类自身除了黑色和白色外不能合成色素颜色,因此需要含有β-胡萝卜素的饲料原料(如胡萝卜、螺旋藻、南瓜)。本试验旨在研究饲料中添加胡萝卜粉、螺旋藻粉和南瓜粉对锦鲤鱼籽色泽和生长性能的影响。本研究采用完全随机设计(CRD)的试验方法,共设4个处理,3个重复:处理a(不添加面粉)、处理B(5%胡萝卜粉)、处理C(1%螺旋藻粉)、处理D(南瓜粉)。黄色的15%)。Kohaku型锦鲤种子的尺寸为7.18±0.58厘米。考虑的变量包括饲料总消耗量、颜色值、染色质细胞数量、相对生长率(RGR)、绝对长度生长、存活率恢复和空气质量。结果表明,最佳处理为5%胡萝卜粉,TKP值为(38.44±1.02)g,色相差值为(2.5±0.05),色相数为(776),色相差值为(2.5±0.05),色相数为(776±38.08)个细胞,相对生长率(RGR)为(1.02±0.76)%/d,绝对生长长度为(0.99±0.07)cm。水质结果为温度25.9 ~ 27.9℃,pH 8.0 ~ 8.5, DO 5.4 ~ 8.0 mg/L。由此可见,饲料中添加胡萝卜、螺旋藻和南瓜粉对锦鲤鱼的颜色亮度有显著影响,但对生长性能无显著影响。
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引用次数: 0
Diversity and Density of Small Mammal Species with Different Seasons and Habitats in Federal University Gashua, Yobe State, North-east Zone of Nigeria 尼日利亚东北部约贝州加舒亚联邦大学不同季节和栖息地小型哺乳动物的多样性和密度
Pub Date : 2023-04-27 DOI: 10.56557/joban/2023/v15i28219
L. I. Adam, J. Eveso, A. Mohammed
The study examined diversity and density of small mammal species with different seasons and habitats in Federal University Gashua, Yobe State, North-East, Nigeria. The university environment was divided in to four (4) habitat types, namely; University residential area (URA), Acacia woodlot (AWL), Lake Area (LA) and Farm Land (LF) were used for the study. Small Mammal species survey was carried out for the period of six (6) months from August to October, 2022 (wet season) and January, to March, 2023 (dry season). Capture Mark–Recapture (CMR) and indirect observations methods were adopted; Survey was conducted using spring door traps of different sizes set at the habitat types during late evening hours 6:00 pm and checked in the morning hours from 6:00-8:30am for four (4) days per week with each habitat types being visited one day per week, making total of (96) man-days. Each habitat type was visited twice a day (morning and evening) which gave a total of (65;60) trapping night in both wet and dry seasons, the number decreased to 60 trapping night in the dry season was due to the wearing a way of vegetation cover. (32) Visits per habitat types and one (1) night survey per month. A total of ten (10) species of small mammals belonging to ten (10) families and seven (7) orders were recorded in the study. African Hedgehog Atelerix albiventris and White toothed shrew Crocidura flavescens  were the most occurring species across The findings of the study shows that the overall diversity index was (1.692), where Four-toed hedgehog Atelerix albiventris had the highest species diversity90.363) and estimated population density of (64.44) followed by Giant pouched rat Cricetomys gambianus with (0.277; 0.018) respectively, Cape hare Lepus capensis and Mongoose Herpestes ichneumon who’s having the lowest diversity of (0.017) with (0. 564) density each in the study area. The month of February has higher number of captured percentage with (24%) in dry season, followed by October with (19%) in the wet season, the lowest capture percentage occurred with August (14%) in the wet season. University Residential Area had more number of individual species having (37.82 %), while Farm land had the least captured percentage of(16.85%).The trap success in both wet season and dry season’s period were (33.04%; 21.67%)respectively. Habitat alteration and destruction due to ongoing constructions project, mainly for university deployment might have accounted for small mammal species low diversity and density in Federal University Gashua.
这项研究调查了尼日利亚东北部约贝州加舒亚联邦大学不同季节和栖息地的小型哺乳动物物种的多样性和密度。大学环境分为四(4)种生境类型,即:;研究使用了大学住宅区(URA)、Acacia林地(AWL)、湖区(LA)和农田(LF)。2022年8月至10月(雨季)和2023年1月至3月(旱季)进行了为期六(6)个月的小型哺乳动物物种调查。采用捕获标记-再捕获(CMR)和间接观测方法;调查使用不同大小的弹簧门诱捕器在晚上6点设置在栖息地类型,并在早上6点至8点30分检查,每周四(4)天,每种栖息地类型每周访问一天,总计(96)人日。每种栖息地类型每天访问两次(上午和晚上),在雨季和旱季总共有(65;60)个诱捕夜,在旱季,由于植被覆盖的磨损,诱捕夜的数量减少到60个。(32)每个栖息地类型的访问和每月一(1)次夜间调查。本研究共记录了十(10)种小型哺乳动物,隶属于七(7)目十(10个)科。非洲刺猬Atelerix albiventris和白齿鼩Crocidura flavescens是整个物种中出现最多的物种。研究结果表明,总体多样性指数为(1.692),其中四趾刺猬的物种多样性最高(90.363),估计种群密度为(64.44),其次是巨袋鼠Cricetomys gambianus,分别为(0.277;0.018),Cape hare Lepus capensis和Mongoose Herpestes ichneumon,其多样性最低(0.017),为(0。564)密度。二月的捕获率较高,旱季为24%,其次是十月,雨季为19%,八月的捕获率最低,雨季为14%。大学居住区的个体物种数量较多(37.82%),而农田的捕获率最低(16.85%)。雨季和旱季的诱捕成功率分别为(33.04%;21.67%),主要用于大学部署可能是联邦大学加斯华分校小型哺乳动物物种多样性和密度低的原因。
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引用次数: 0
Study of the Tiphiidae Family (Insecta Hymenoptera) as Natural Enemies of Cicadas and Beetles 蝉科(膜翅目昆虫)作为蝉和甲虫天敌的研究
Pub Date : 2023-03-16 DOI: 10.56557/joban/2023/v15i28161
C. Marchiori
The females are Tiphiidae notable because they parasitize the tiger beetle lar and are powerful predators living predators that live in touch. The males are winged them spend most of their time flying or resting on the vegetation, being that the females are apterous, and invested much of their time below the surface. The larvae are parasitoids of beetle larvae (mostly scarab beetles). The objective of this paper is to determine the biology, ecology, life cycle taxonomy of the Tiphiidae Family. The methodological basis of the present work consists of bibliographical research that used the following databases SciELO, Central Library of the University of Brasília and scientific research, scientific book chapters, theses databases, university dissertations, national and international scientific articles classified by the Coordination for the Improvement of Higher Education Personnel (CAPES). The main terms used were: Hymenoptera Parasitic, parasitoid, hosts, Typhiidae and microhymenoptera.
雌性是虎科动物,因为它们寄生在虎甲虫身上,是强大的捕食者,是生活在接触中的捕食者。雄性长着翅膀,它们大部分时间都在植被上飞行或休息,因为雌性很敏捷,大部分时间都花在地表下。幼虫是甲虫幼虫的寄生蜂(主要是金龟子)。本论文的目的是确定斑蝶科的生物学、生态学和生命周期分类。本工作的方法论基础包括书目研究,使用以下数据库SciELO、巴西利亚大学中央图书馆和科学研究、科学书籍章节、论文数据库、大学学位论文、,由高等教育人员改进协调会(CAPES)分类的国家和国际科学文章。使用的主要术语有:膜翅目寄生蜂、寄生蜂、寄主、鼠科和微小膜翅目。
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引用次数: 0
Study of the Megalyridae and Monomachidae Families (Insecta: Hymenoptera) 巨蝶科和单蝶科的研究(昆虫纲:膜翅目)
Pub Date : 2023-03-09 DOI: 10.56557/joban/2023/v15i18140
C. Marchiori
Megalyridae wasps are thought to be idiobiont endoparasitoids of concealed insect larvae. Parasitoids of larvae of broaching beetles, families Bostrichidae, Buprestidae, Cerambycidae (Coleoptera), and Pemphredonidae (Hymenoptera). Little is known about the hosts of Monomachidae: The Australian species Monomachus antipodalis Westwood, 1874 acts as an egg-larval or egg-pupal parasitoid of Boreoides spp. (Diptera: Stratiomyidae, Chiromyzinae). The aim of this article is to study the characteristics of bioecology and taxonomy of the Megalyridae and Monomachidae Families (Insecta: Hymenoptera). The review was carried out in Goiânia, Goiás, Brazil from November 2022 to December 2022. Study or work uses the reference of bibliographic research, understood as the act of asking and seeking information on certain subjects such as Hymenoptera Parasitica through a survey carried out in national and foreign magazines classified by the Coordination for the Improvement of Higher Education Personnel (CAPES), with the aim of detecting what there is consensus or controversy in the state of the art of literature in the libraries of the University of Brasília and the University of São Paulo on websites at (LILACS) and (SciELO) and in book scientific chapters, national and international scientific articles. It is an important work, both for hymenopterologists dedicated to studying parasitoids and for other entomologists interested in the biological control of insect pests.
巨唇蜂科的黄蜂被认为是隐蔽昆虫幼虫的内寄生虫。胸甲幼虫的寄生虫,Bostrichidae科,Buprestidae科、Cerambycdae科(鞘翅目)和Pemphredonidae科(膜翅目)。关于Monomachidae的宿主知之甚少:澳大利亚物种Monomachus antipodalis Westwood,1874年,是Boreoides spp.的卵幼虫或卵蛹寄生蜂。本文旨在研究巨蝶科和单蝶科(昆虫纲:膜翅目)的生物生态学和分类学特征。审查于2022年11月至2022年12月在巴西戈亚斯的戈尼亚进行。研究或工作使用书目研究的参考,被理解为通过在高等教育人员改进协调会(CAPES)分类的国内外杂志上进行的调查,询问和寻求某些主题的信息,如膜翅目寄生虫,目的是了解巴西利亚大学和圣保罗大学图书馆在(LILACS)和(SciELO)网站以及书籍科学章节、国家和国际科学文章中的文学艺术现状中存在的共识或争议。这是一项重要的工作,无论是对致力于研究寄生蜂的膜翅目昆虫学家还是对害虫生物控制感兴趣的其他昆虫学家来说。
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引用次数: 0
Technology Package for Induced Mutagenesis 诱变技术包
Pub Date : 2023-02-17 DOI: 10.56557/joban/2023/v15i18077
S. Datta
It is more than 80 years since mutagens were identified as a source of inducing genetic variability in a living system. Since then scientific community is deeply engaged to apply mutation techniques in the crop improvement program. Worldwide activities have generated a massive amount of literature and have led to the release of over 3,000 mutant plant varieties. Many research papers are published each year which are just a stereotype model year after year and we are still repeating some of our experiments as routine activities. Time has come to highlight the history of the past work, rise and fall, reality and limitations of achievements, and prospects of mutation technology.  It is now necessary to assess the present status of mutation after extensive research activities and must implement whatever correction is needed to develop a complete package of mutation technology for maximum commercial utilization of the mutation technique. The knowledge generated so far on vegetatively propagated crops, especially on ornamental crops will work as a model system to prepare a complete technology package for future need-based planning of successful and accurate application of mutation techniques in the crop improvement program.  The article will provide an authoritative review account of many important basic aspects and technical advancements in mutation technology.
诱变剂被确定为在生命系统中诱导遗传变异的来源已有80多年的历史。从那时起,科学界就致力于将突变技术应用于作物改良项目。世界范围内的活动已经产生了大量的文献,并导致了3000多个突变植物品种的发布。每年发表的许多研究论文都只是年复一年的刻板印象模型,我们仍然把一些实验作为日常活动来重复。现在是时候强调过去工作的历史,兴衰,成就的现实和局限性,以及突变技术的前景。现在有必要在广泛的研究活动后评估突变的现状,必须实施任何需要的纠正,以开发一套完整的突变技术,以最大限度地利用突变技术的商业利用。到目前为止,关于无性繁殖作物,特别是观赏作物的知识将作为一个模型系统,为未来在作物改良计划中成功和准确地应用突变技术的需求规划准备一个完整的技术包。本文将对突变技术的许多重要基础方面和技术进展进行权威的评述。
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引用次数: 1
Effect of Land Use Change on Soil Physico-Chemical Properties under Different Land Use System in Arsi Zone, Oromia Region, Ethiopia 埃塞俄比亚奥罗米亚地区Arsi区不同土地利用制度下土地利用变化对土壤理化性质的影响
Pub Date : 2023-02-17 DOI: 10.56557/joban/2023/v15i18076
Kabtamu Girma, F. Yimer, T. Tamirat, A. Abdelkadir
The establishment of artificial plantation using Eucalyptus globules in Ethiopia is becoming economically important for improving the livelihoods of small holder farmers. The species are adapted to different soil depths with varied responses to soil physical and chemical properties that have an implication on the proper management of environmentally sensitive areas. However, the sources of variations of soil physical and chemical properties have not been well investigated and documented for most vertisol in Ethiopia. This study was designed to investigate soil physical and chemical properties variations under different land use systems of cropland, grazing land and trees covered area with Eucalyptus globulus plantation at Gusha Temela Kebele, Arsi Zone and Oromia, Ethiopia. A total of 48 composite soil samples with 4 replicates * 3 treatments * 2 sampling plots * 2 at soil depths of 0–10 and 10–20cm were used for laboratory analysis. Some of the soil physical and chemical properties were analyzed and interpreted including soil texture, bulk density), soil moisture content, pH, available phosphorus (available P), soil organic carbon, total nitrogen and carbon to nitrogen ratio (C/N ratio). The results showed that, except in a few cases, all considered soil properties showed significant differences with land use types and soil depths. Soil Bulk density (r=0.0002), soil moisture content (r<0.0001), soil pH (r<0.0001), available phosphorus (0.0002) and soil organic carbon (r<0.0001) were significantly varied with land use types. Textural fractions of sand, silt and clay showed no significant difference with land use types and soil depths. Although not significant, the clay content was slightly higher under grazing land. On the other hand, soil parameters including bulk density, soil moisture content, pH, soil organic carbon and total nitrogen were higher under grazing land than in the rest land use types and significantly varied with respect to soil depths; greater in the lower soil depth except for soil organic carbon and total nitrogen which were higher in the upper soil depth. The textural fraction of clay across all land use types was higher in the lower depth than in the upper surface layer which could be due to the translocation of this fine particle from the upper soil layer to the lower one. Findings of the present study indicated that land use change has more effect on soil chemical than physical parameters that grazing land is more fertile than other land use types. It implies that management practices significantly influence soil chemical properties variations especially the soil organic carbon concentrations for better employment of land management practices through implementation of climate smart agriculture.
在埃塞俄比亚,利用桉树球建立人工人工林对改善小农户的生计具有重要的经济意义。这些物种适应不同的土壤深度,对土壤的物理和化学性质有不同的反应,这对环境敏感地区的适当管理具有重要意义。然而,埃塞俄比亚大多数垂直土壤的土壤物理和化学性质变化的来源尚未得到很好的调查和记录。研究了埃塞俄比亚奥罗米亚地区古沙Temela Kebele、Arsi地区和奥罗米亚地区不同土地利用方式下的农田、牧场和蓝桉人工林土壤理化性质的变化。采用4个重复* 3个处理* 2个样地* 2个复合土壤样品,土壤深度分别为0 ~ 10和10 ~ 20cm,共48个样品进行室内分析。分析和解释了土壤的一些理化性质,包括土壤质地、容重、土壤含水量、pH、速效磷(速效P)、土壤有机碳、全氮和碳氮比(C/N)。结果表明,除少数情况外,所有考虑的土壤性质在土地利用类型和土壤深度上都存在显著差异。土壤容重(r=0.0002)、土壤含水量(r<0.0001)、土壤pH (r<0.0001)、速效磷(0.0002)和土壤有机碳(r<0.0001)随土地利用类型的不同而显著变化。不同土地利用类型和土壤深度对砂、粉、粘质组分的影响不显著。虽然不显著,但放牧条件下粘土含量略高。另一方面,放牧土壤容重、土壤含水量、pH、土壤有机碳和全氮等土壤参数均高于其他土地利用类型,且随土壤深度变化显著;除土壤有机碳和全氮在土壤表层较高外,其余土壤深层均较高。在所有土地利用类型中,粘土的质地分数在下层土壤中高于上层土壤,这可能是由于这种细颗粒从上层土壤转移到下层土壤。研究结果表明,土地利用变化对土壤化学参数的影响大于对土壤物理参数的影响,放牧土地比其他土地利用类型更肥沃。这意味着管理实践显著影响土壤化学性质变化,特别是土壤有机碳浓度,通过实施气候智能型农业,可以更好地利用土地管理实践。
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