Distribution patterns of tree,understorey, and detritus biomass in coniferous and broad-leaved forests of Western Himalaya,India     

Javid A. Dar  Mohd Y. Rather  K. Subashree  S. Sundarapandian 《Journal of Sustainable Forestry》2017,36(8):787-805

Forest biomass pools are the major reservoirs of atmospheric carbon in both coniferous and broad-leaved forest ecosystems and thus play an important role in regulating the regional and global carbon cycle. In this study, we measured the biomass of trees, understorey, and detritus in temperate (coniferous and broad-leaved) forests of Kashmir Himalaya. Total ecosystem dry biomass averaged 234.2 t/ha (ranging from 99.5 to 305.2 t/ha) across all the forest stands, of which 223 t/ha (91.9–283.2 t/ha) were stored in above- and below-ground biomass of trees, 1.3 t/ha (0.18–3.3 t/ha) in understorey vegetation (shrubs and herbaceous), and 9.9 t/ha (4.8–20.9 t/ha) in detritus (including standing and fallen dead trees, and forest floor litter). Among all the forests, the highest tree, understorey, and detritus biomass were observed in mid-altitude Abies pindrow and Pinus wallichiana coniferous forests, whereas the lowest were observed in high-altitude Betula utilis broad-leaved forests. Basal area has showed significant positive relationship with biomass (R² = 0.84–0.97, P < 0.001) and density (R² = 0.49–0.87). The present study will improve our understanding of distribution of biomass (trees, understorey, and detritus) in coniferous and broad-leaved forests and can be used in forest management activities to enhance C sequestration.  相似文献   

Effect of species grouping and site variables on aboveground biomass models for lowland tropical forests of the Indo-Malay region     

Solichin Manuri  Cris Brack  Teddy Rusolono  Fatmi Noor’an  Louis Verchot  Sandhi I. Maulana  Wahyu C . Adinugroho  Hery Kurniawan  Dian Wulansih Sukisno  Gita Ardia Kusuma  Arif Budiman  Rahmad Supri Anggono  Chairil Anwar Siregar  Onrizal Onrizal  Dhany Yuniati  Emma Soraya 《Annals of Forest Science》2017,74(1):23

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Streptococcosis in red hybrid tilapia (Oreochromis niloticus) commercial farms in Malaysia     

Najiah Musa  Lee Seong Wei  Nadirah Musa  Ruhil H Hamdan  Lee Kok Leong  Wendy Wee  Mohd Nur Amal  Basiriah M Kutty  & Siti Zahrah Abdullah 《Aquaculture Research》2009,40(5):630-632

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Allelic segregation of sex‐linked microsatellite markers in Nile tilapia (Oreochromis niloticus) and validation of inheritance in YY population     

Nargis Sultana  Mohd Golam Quader Khan  Mostafa Ali Reza Hossain  Md Samsul Alam 《Aquaculture Research》2020,51(5):1923-1932

Stocking of all‐male fingerling produced by direct administration of male hormone 17‐α‐methyltestosterone is the most preferred method for present‐day aquaculture of the Nile tilapia Oreochromis niloticus. However, due to the growing concern of negative impact of steroid hormone in food fish, production of ‘genetically male’ tilapia, which depends on the concrete and thorough understanding of sex determination, has long been a scientific curiosity. The objective of the present study was to identify reliable sex‐linked markers and to evaluate the applicability of those markers in terms of monosex production approach. ‘XY’ neofemales were produced by using synthetic oestrogen and identified through selective breeding and progeny testing. Three females with progeny not deviating from 3:1 sex ratio (male:female) were designated as ‘XY’ neofemales and were used subsequently to produce putative YY progeny. Among the fifteen microsatellite markers tested, marker ARO172 was most informative in differentiating male and female genotypes. Twenty‐seven F₂ fish from three families were identified as putative YY males based on marker genotyping, and four of them were crossed to produce F₃ to validate marker association by progeny testing. The YY males produced 86%–100% male progeny indicating ARO172 a unique sex‐linked marker applicable in marker‐assisted selection.  相似文献   

Assessment of growth condition for a candidate probiotic, <Emphasis Type="Italic">Shewanella algae</Emphasis>, isolated from digestive system of a healthy juvenile <Emphasis Type="Italic">Penaeus monodon</Emphasis>     

Shahram Shakiba Zadeh  Che Roos Saad  Annie Christianus  Mohd Salleh Kamarudin  Kamaruzaman Sijam  Mariana Nor Shamsudin  Vasantha Kumari Neela 《Aquaculture International》2010,18(6):1017-1026

To conquer disease problem in shrimp industries, probiotic biocontrol is a well-known remedy now. The antagonistic ability of separated isolates from different parts of juvenile P. monodon was screened against shrimp Vibrio pathogens, V. parahaemolyticus and V. alginolyticus. The most antagonistic effect was observed for an isolate that primarily identified as Shewanella algae using conventional method followed by Biolog GN and GP microplates. Since adaptability to the host optimum cultural condition of the target organism is of the great importance, response surface methodology, with central composite design, was applied to assess log cell count response of S. algae in different incubation conditions. Therefore, four independent variables were assumed as: temperature (10–50°C), pH (6–10), NaCl concentration (0–50‰) and time (12–60 h). The coefficients of multiple determinations (R ²) for the responses log cell count of S. algae being 0.827. Temperature was the merely significant independent variable that affected the log cell count of the candidate probiotic. The candidate probiotic was revealed a reasonable growth response in quite wide range of temperature, pH and NaCl concentration in which the maximum levels were in same range of optimum shrimp culture.  相似文献   

乌鲁木齐达坂城山区地衣物种多样性研究     

李作森  买吾拉江·衣沙克  艾尼瓦尔·吐米尔 《西北林学院学报》2022,37(1):145-151

为查明达坂城山区地衣物种多样性及其分布特征，在研究区不同海拔设置样地，开展了野外调查和室内鉴定分析。结果表明，达坂城山区地衣共有68种，隶属11目23科38属。其中，茶渍目、微孢衣目和黄枝衣目包含45个种（66.18%），占优势地位。地衣种类组成优势科、优势属和单属科、单种属情况明显，表现出达坂城山区地衣区系的特殊性和单一性。达坂城山区地衣主要由岩面生和地面生地衣种类组成，岩面生地衣占总种数的72.06%，地面生地衣占总种数的27.94%。壳状地衣在研究区占绝对优势，其次是叶状地衣和鳞片状地衣。该地区地衣共生藻类型主要为共球藻和球形绿藻，适应该地区干旱的生境条件。该地区地衣的分布具有垂直地带性特征，山地草原带的地衣种类最多，共47种，占总种数的69.12%；亚高山草甸带27种，占总种数的39.71%；高山草甸带25种，占总种数的36.76%。  相似文献   

新疆2021年棉花生产剖析及未来种业发展方向     

麦丹别克·安尼瓦尔  热甫克提·阿布来提  马腾  买买提·莫明 《棉花科学》2022,44(1):11-14

通过对新疆棉花生产和种业状况调研表明,新疆2021年植棉面积为250.62万公顷,其中机采棉种植面积112.642万公顷(占44.95％);皮棉单产平均增加10％左右,为2100 ～2250 kg/hm2,总产预计在510余万吨,较上年增加10余万吨;白棉占比、平均长度、断裂比强度、马克隆值和轧工质量均较上年有所下滑;棉价明显上涨,较上年涨幅为16％左右.种子是农业生产的基础和命脉,因此提出了"实事求是地直面不足、补齐短板,加大投入力度,建立更加完善的科技成果转化机制,提高育种创新能力"的未来种业发展方向.旨在促进新疆棉花产业健康稳定发展.  相似文献