Conservation agriculture practice influences soil organic carbon pools in intensive rice-based systems of the Eastern Indo-Gangetic Plain     

Md. Ariful Islam  Richard W. Bell  Chris Johansen  M. Jahiruddin  Md. Enamul Haque  Wendy Vance 《Soil Use and Management》2022,38(2):1217-1236

Studies of rice-based systems in the Indo-Gangetic Plain (IGP) have demonstrated the beneficial effects of Conservation Agriculture on soil organic carbon (SOC) status, along with increased soil health and crop productivity. However, it remains unclear as to the time for such treatments to have a positive effect. In this study of lentil-mung bean-rice and wheat-mung-rice rotations in Bangladesh positive effects of strip planting or bed planting, along with residue return, on SOC pools were apparent after 1.5 years, compared with intensive conventional tillage and limited residue return. Conventional tillage resulted in higher CO₂ emission compared with strip planting or bed planting as did high residue return. In the cereal-dominated rotation, the strip planting system sequestered carbon at a rate of 0.24–0.53 Mg C ha⁻¹ year⁻¹ (at 0–0.15 m depth) while conventional tillage was associated with a carbon loss of 0.52–0.82 Mg C ha⁻¹ year⁻¹. In the legume-dominated rotation, neither practice sequestered SOC. Under strip planting, a minimum annual crop residue input of 1.7 Mg C ha⁻¹ for the cereal-dominated system and 5.2 Mg C ha⁻¹ for the legume-dominated system was required to maintain SOC at equilibrium. We conclude that strip planting with high levels of crop residue return can be an effective and quick strategy in either slowing the loss of SOC or improving C sequestration in the intensive rice-based systems of the Eastern IGP.  相似文献   

Effect of dilute alkali pretreatment on structural features and enhanced enzymatic hydrolysis of Miscanthus sinensis at boiling temperature with low residence time     

Md. Azizul Haque  Dhirendra Nath Barman  Tae Ho Kang  Min Keun Kim  Jungho Kim  Hoon Kim  Han Dae Yun 《Biosystems Engineering》2013,114(3):294-305

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Allozyme variation of hatchery and river populations of rohu (Labeo rohita, Hamilton) in Bangladesh     

Md. Mukhlesur Rahman Khan  Mohammad Shafiqul Alam  & Mohammad Maqueshudul Haque Bhuiyan 《Aquaculture Research》2006,37(3):233-240

The genetic variations of rohu (Labeo rohita, Hamilton) sampled from five hatchery populations (Arabpur, Brahmaputra, Comilla, Kishorganj and Natore) and three major river populations (the Halda, the Jamuna and the Padma) were analysed by allozyme electrophoresis. Ten enzymes encoded by 11 loci were screened, and six were polymorphic. Alleles at three loci (Est‐1^*, Gpi‐1^* and Gpi‐2^*) proved variable for hatchery and river populations, and the Mdh‐2^* locus exhibited heterozygous genotypes for river populations only. Polymorphic loci per population (27.3±5.3%), heterozygous loci per individual (15.5±1.2%) and relative gene diversity (0.27±0.08) in river populations were higher than those for hatchery populations (25.5±1.8%, 10.7±1.6% and 0.25±0.01 respectively). Also, the observed heterozygosity (Ho) and expected heterozygosity (He) (0.09±0.03 and 0.14±0.04 respectively) in river populations were higher than those in hatchery populations (0.08±0.01 and 0.11±0.01 respectively). The lower levels of genetic variability in hatchery populations suggested the occurrence of inbreeding and/or genetic drift. The pairwise population differentiation (F_ST) values showed a lower level of genetic differentiation between hatchery and river population pairs. The unweighted pair‐group method with arithmetic mean dendrogram of Nei's genetic distances showed a relationship between the genetic distance and geographic distance. The populations were clustered into three groups: the Padma in one group, the Halda in second group and the Jamuna, including five hatcheries, in the third group. Highly diversified rohu individuals were observed in the Padma and Halda Rivers, whereas less genetically variable individuals were found in the Jamuna River and five hatcheries. These findings can be useful for rohu hatchery propagation to enhance the sustainable aquaculture production.  相似文献   

Fishing and trade of devil rays (Mobula spp.) in the Bay of Bengal,Bangladesh: Insights from fishers’ knowledge     

Alifa Bintha Haque  Nidhi Gloria D'Costa  Mahi Washim  Amit Robert Baroi  Nazia Hossain  Mashrur Hafiz  Sumaiya Rahman  Karabi Farhana Biswas 《水产资源保护:海洋与淡水生态系统》2021,31(6):1392-1409

1. Devil rays (Mobula spp.) are globally threatened cartilaginous fishes that have attracted global conservation concern owing to their high extinction risk and lack of protection in many countries. Limited resources and data on threatened marine species, including devil rays, impede conservation actions, particularly in developing countries, many of which have high biodiversity.
2. Devil ray catch is a component of artisanal fisheries in Bangladesh, but data on their fisheries and trade are limited. To characterize devil ray fishing practices, fishers’ perception and trade, 230 fishers and traders were interviewed between 4 June 2018 and 22 June 2019, in four areas of south-east Bangladesh. Catch data were also opportunistically collected at landing sites.
3. Six devil ray species were documented, caught in an array of gill nets, set-bag nets and longlines. All interviewed fishers reported life-long devil ray bycatch in some numbers, and also noted a decline in catch over the last decade. Bottom trawling, increased bycatch levels, increased demand for devil ray products and, in some cases, ecosystem changes were identified by fishers as threats to devil ray populations.
4. Unregulated and undocumented trade and retained bycatch, especially by gill nets and set-bag nets, are fuelled by local consumption of devil ray meat and international trade in meat and gill rakers. Compliance with international trade control treaties for all Mobula spp. or the Bangladeshi law protecting Mobula mobular was low, with the majority of fishers (87%, n = 174) unaware of their existence.
5. To manage devil ray fisheries, and prevent possible population declines, we propose a combination of legally enforced gear modifications, and catch and trade control through community-owned implementation strategies. Additionally, we propose the simultaneous implementation of inclusive, community-based awareness and stewardship projects in conjunction with a coast-wide ray monitoring programme. Finally, we emphasize that more research and action rooted in a sustainable fishery model is urgently needed to protect Bangladeshi devil ray populations.

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COVID-19 impacts on the Bangladesh shrimp industry: A sequential survey-based case study from southwestern Bangladesh     

Bashar  Abul  Heal  Richard D.  Hasan  Neaz A.  Salam  Md. Abdus  Haque  Mohammad Mahfujul 《Fisheries Science》2022,88(6):767-786

Shrimp farming is fundamental to the national economy of Bangladesh, particularly through earning foreign currency. The nationwide lockdown and international cargo restriction jeopardized the sector and breaking its marketing chain. Assessing the degree of farming socio-economic peril from COVID-19 and suggesting early coping strategies and long-term mitigation measures are pressing to build resilience for this food production sector. To collect survey data, two key-informant face-to-face surveys with 51 shrimp farmers and 62 consumers in southwest Bangladesh were accomplished. As national lockdowns restricted access to export markets and movements within the country, farm incomes decreased against rising production costs. To compensate, farmers reduced their workforce (29.4%), but even with the sale of co-cultured finfish still suffered from large drops in revenue (42.8% average profit reduction). Furthermore, we present evidence that shrimp farmers should consider diversification of aquaculture product type as co-culture of additional shrimp species was a poor mitigation strategy against large market price fluctuations. Product price reductions were passed on to the consumer, who enjoyed falling product prices including more expensive shrimp products, but the markup for nearly all aquaculture products increased. The current jeopardy and consequences of shrimp farming future are discussed, including coping strategies to help policymakers in building resilience against future uncertainties.

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Status of the golden jackal as an agricultural pest in Bangladesh : Joe E. Brooks, with M. Emdadul Haque and colleagues, discusses the jackal''s role in the agroecosystem     

Joe E. Brooks  M. Emdadul Haque  Shahabuddin Ahmad 《Crop Protection》1993,12(8):563-564

The golden jackal is perceived by farmers in Bangladesh as a primary pest of agricultural crops and domestic livestock. Very few farmers take any actions to reduce jackal attack on crops or livestock other than guarding their fields at night during the ripening crop stages. Rarely have the role and importance of the jackal as a small mammal predator in the agroecosystem in Bangladesh been studied. Until studies are completed to clarify these issues, lethal methods of jackal management should not be attempted.  相似文献   

孟加拉杂交水稻研究概况   总被引：2，自引：0，他引：2  

廖伏明 《杂交水稻》1997,12(6):26-27

孟加拉杂交水稻研究概况＊ＨｙｂｒｉｄｒｉｃｅｒｅｓｅａｒｃｈｉｎＢａｎｇｌａｄｅｓｈＡ．Ｗ．Ｊｕｌｆｉｑｕａｒ，Ｍ．ＭｏｈｉｕｌＨａｑｕｅ，Ａ．Ｋ．Ｇ．Ｍ．ＥｎａｍｕｌＨａｑｕｅ，Ｍ．ＡｌａｍｇｉｒＨｏｓａｉｎ（孟加拉水稻研究所Ｇａｚｉｐｕｒ１７０１...  相似文献   

Feeding Effect of Triticale Fodder as Replacement of Straw on Production Performance of Dairy Cows     

Nathu Ram Sarker  Mohammad Asaduzzaman  Khan Shahidul Huque  Mohammad Toyebur Rahman  NazrulIslam  Mohammad Enamul Haque  Stephen R. Waadington 《农业科学与技术》2013,(1):72-82

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Effect of shifting cultivation on soil physical and chemical properties in Bandarban hill district, Bangladesh     

Khandakar Showkat Osman  M. Jashimuddin  S. M. Sirajul Haque  Sohag Miah 《林业研究》2013,24(4):791-795

This study reports the effects of shifting cultivation at slashing stage on soil physicochemical properties at Bandarban Sadar Upazila in Chittagong Hill Tracts of Bangladesh. At this initial stage of ...  相似文献   

轮换种植对孟加拉国吉大港山区土壤中真菌和细菌群落的影响     

Sohag Miah  Soma Dey  S. M. Sirajul Haque 《林业研究》2010,21(3):311-318

在孟加拉国吉大港山区选择两块研究地,研究轮换种植对土壤中真菌和细菌群落的影响。两块研究地均包含轮换种植和本地社区管理的乡村森林,第一块研究地点选择在兰加马蒂地区,第二块研究地点选择在吉大港的班多尔班地区。在两个地点和不同用途的地块中,其表面土（0-10cm）和地表下土（10-20cm）的土壤质地不同,分别为砂壤和粘土。轮作地的土壤pH和含水量比乡村森林的低。研究结果表明：在兰加马蒂和班多尔班地区,大多数情况下,轮作地的表面土和地表下土壤中的真菌和细菌群落数量比乡村森林的低。在兰加马蒂和班多尔班地区的轮作地中,炭疽菌属（CoHetrotrichum）和镰孢菌属（Fusarium）真菌稀少,而两个地方的不同用途地块中均有细菌球菌属（Coccus）,芽孢杆菌属（Bacillus）和链球菌属（Streptococcus）。在两个地方的不同用途地块中常见的真菌有曲霉属（Aspergillus）、根霉属（Rhizopus）、木霉属（Trichoderma）和青霉菌属（Penicillium）。在其它的土壤区系中,由于轮换种植导致土壤环境退化的程度还需要进一步的研究。  相似文献