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首页> 外文学位 >EFFECTS OF FLOODING DATES AND DISPOSALS OF RICE STRAW ON CRAYFISH, PROCAMBARUS CLARKII (GIRARD), CULTURE IN RICE FIELD.
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EFFECTS OF FLOODING DATES AND DISPOSALS OF RICE STRAW ON CRAYFISH, PROCAMBARUS CLARKII (GIRARD), CULTURE IN RICE FIELD.

机译：稻田淹水时期和处置方式对小龙虾，原螯虾（Girard），稻田文化的影响。

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摘要

Studies were conducted to determine the effects of flooding dates and different disposals of rice straw on crayfish culture in rice field. Nutritional composition of decayed rice straw, periphyton growth, and water quality were also determined. Eighteen earthen ponds were randomly assigned to six treatments in a two by three factorial arrangement: early flooding (20/Sept/1978), late flooding (15/Oct/78), and aerobic (baled), anaerobic (disked), partially aerobic (standing) decomposition of rice straw with three replications each.;von Bertalanffy's growth model revealed that all crayfish in early-flooded ponds attained an average maximum length (1(,00)) and Brody's growth coefficient (k) of 92.2 mm and 0.55, respectively, whereas all crayfish in late-flooded ponds had an 1(,00) and k of 82.7 mm and 0.09. Crayfish in disked ponds showed the poorest growth of all treatments.;Late-flooded ponds had a higher population density than early flooded ponds. The population density was highest in baled ponds followed by standing and disked ponds. The harvestable crayfish size (total length > 75 mm) in decreasing order were: standing ponds (19.4 g), baled ponds (18.3 g), and disked ponds (17.0 g).;Rice straw decomposed fastest in baled ponds, followed by standing ponds and disked ponds with average weight loss of 77.1, 66.6 and 48.9%, respectively, after 5-months decomposition. The C:N ratio or rice straw at flooding was 57. It took 4 months for the C:N ratio to drop below 17 for rice straw in baled and standing ponds. The average C:N ratio of rice straw in disked ponds was 23 after 5 months decomposition.;The average crayfish production in early-flooded ponds (1183 kg/ha) did not differ significantly from that in late-flooded ponds (1127 kg/ha). Significant differences (P < 0.05) in average crayfish production were found between standing ponds (1506 kg/ha) and disked ponds (803 kg/ha), and between baled ponds (1157 kg/ha) and disked ponds. The average crayfish production in standing ponds was not significantly higher than in baled ponds.;The average dawn dissolved oxygen (DO) was consistently higher in early-flooded ponds than in late-flooded ponds with a difference of 1.3 mg/l. For the first 5-weeks after flooding, average dawn DO was highest in baled ponds (1.5 mg/l). After that, disked ponds had the highest dawn DO.;Eighteen weeks after flooding, early-flooded ponds had higher periphyton biomass (337 g/m('2)) than late-flooded ponds (216 g/m('2)). The periphyton biomass was highest in standing ponds (358 g/m('2)), followed by baled ponds (333 g/m('2)) and disked ponds (307 g/m('2)).
机译：进行了研究以确定水淹日期和稻草的不同处置方式对稻田小龙虾养殖的影响。还确定了稻草腐烂的营养成分，周生植物的生长和水质。十八个土池被随机分配为六种处理方法，分为两乘三析：早期洪水（1978年9月20日），晚期洪水（10月10日/ 78日），好氧（打包），厌氧（盘式），部分好氧（站立）稻草的分解，每个稻草具有三个重复； von Bertalanffy的生长模型表明，早淹池塘中的所有小龙虾均达到平均最大长度（1（，00）），而Brody的生长系数（k）分别为92.2 mm和0.55 ，而后期淹没池塘中的所有小龙虾的1（，00）和k分别为82.7 mm和0.09。盘状池塘中的小龙虾显示了所有处理方法中生长最差的；后期淹没的池塘比早期淹没的池塘具有更高的种群密度。秃池的人口密度最高，其次是立式和盘形池塘。可收获的小龙虾尺寸（总长度> 75毫米）按降序排列：立式池塘（19.4 g），打包池（18.3 g）和盘状池塘（17.0 g）。；稻草在打包池中分解最快，然后放置分解5个月后，平均体重减轻分别为77.1％，66.6％和48.9％。洪水时稻草的C：N比为57。在成捆的池塘和直立的池塘中，稻草的C：N比降至17以下不到4个月。盘状池塘分解5个月后，稻草的平均C：N比为23 ;;早期淹没池塘的小龙虾平均产量（1183 kg / ha）与后期淹没池塘的平均小龙虾产量（1127 kg / hm2）没有显着差异哈）。发现小龙虾平均产量在立式池塘（1506 kg / ha）和圆盘池塘（803 kg / ha）之间以及打包池（1157 kg / ha）和圆盘池塘之间有显着差异（P <0.05）。站立池塘的小龙虾平均产量没有显着高于捆扎池塘。;早期注水池塘的平均黎明溶解氧（DO）始终高于后期注水池塘，相差1.3 mg / l。在洪水后的前5周，成捆池塘的平均黎明DO最高（1.5 mg / l）。之后，盘状池塘的黎明DO最高。洪水后18周，早淹池塘的周生生物量（337 g / m（'2））比晚淹池塘（216 g / m（'2））高。 。立式池塘的围生植物生物量最高（358 g / m（'2）），其次是打包池塘（333 g / m（'2））和盘状池塘（307 g / m（'2））。

著录项

  • 作者

    CHIEN, YEW-HU.;

  • 作者单位

    Louisiana State University and Agricultural & Mechanical College.;

  • 授予单位 Louisiana State University and Agricultural & Mechanical College.;
  • 学科 Forestry.
  • 学位 Ph.D.
  • 年度 1980
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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