Study on the forms of phosphorus in the sediments from the Zhejiang offshore

本文分析测定了浙江近岸海域57份表层沉积物和5个柱状样沉积物中的总磷含量，运用SEDEX方法分级提取和测定了沉积物中5种形态磷及其含量，研究了沉积物中各种形态磷的分布变化特征及其与环境因子的相关性，估算了浙江近岸海域的生物可利用性磷，进行了沉积物质量评价，探讨了沉积物有机磷的降解、N/P比值等化学行为。取得主要的研究结果： 1.对浙江近岸海域表层沉积物和柱状样沉积物分级提取的5种形态磷分别为弱吸附态磷（Ads-P）、铁结合态磷（Fe-P）、自生磷灰石及钙结合态磷（Ca-P）、碎屑态磷（De-P）和有机磷（OP），其含量大小依序为De-P＞Fe-P＞OP＞Ca-P＞Ads-P。 2.表层沉积...The study analyzes the content of total phosphorus in surface sediments and in core sediments of Zhejiang offshore. The five species phosphorus in the surface sediments and core sediments of Zhejiang offshore were studied by SEDEX method. Study of phosphorus in sediments distribution and its changes associated with environmental factors and bioavailability of phosphorus were estimated. Sediment qu...学位：理学硕士院系专业：海洋与环境学院海洋学系_海洋化学学号：2242008115146

长江口柱状沉积物中磷的存在形态及其分布特征研究

对长江口的柱状沉积物进行了总磷测定,并运用SEDEX方法分析了长江口柱状沉积物中5种形态磷的含量和分布。研究结果表明,柱状样沉积物不同站位各种形态磷的垂直分布各不相同,由表至底呈现多种分布状态,与沉积环境、沉积后的成岩作用有关。长江口柱状样沉积物有机磷的降解速率常数变化结果表明,长江口海域有机磷的降解主要发生在沉积物表层和次表层。2个柱状样沉积物中氮磷比远低于16∶1,说明长江口近岸海域沉积物中的磷主要来自陆源。对柱状样的年代分析表明,总磷含量随年代的变化有明显的区域特征性,长江口总磷含量的髙值与长江较大输沙量的年份具有一致性。浙江省环保科研计划项目(2008-30

サトウキビ野生種と製糖用品種との種間雑種を利用して作出した熊毛地域向け株出し多収品種「はるのおうぎ」

“Harunoogi” is a new sugarcane cultivar jointly developed by the NARO Kyushu Okinawa Agricultural Research Center and the Japan International Research Center for Agricultural Sciences. It shows vigorous initial growth after ratooning and high ratoon yield in the Kumage region in the Kagoshima Prefecture, and has been applied for variety registration for the region in March 2019. “Harunoogi” was selected from progenies derived from crossing between a high ratoon yield forage cultivar “KRFo93-1” as seed parent and a thick-stalk early maturing cultivar “NiN24” as pollen parent. The “KRFo93-1” was developed by interspecific hybridization of a commercial sugarcane cultivar with a wild sugarcane (Saccharum spontaneum L.). Ratooning ability and number of tillers of “Harunoogi” are higher than those of “NiF8”, which is a major cultivar in the Kumage region. Even though single stalk weight of “Harunoogi” is smaller than “NiF8”, stalk yield is much higher compared to “NiF8” due to its large number of millable stalks in both plant and ratoon crops. Sucrose content of “Harunoogi” is comparable with “NiF8”. As a result, sugar yield of “Harunoogi” is much higher than “NiF8”. In addition, “Harunoogi” has good adaptability for mechanical harvesting because of its high lodging-resistance and vigorous initial growth in ratoon crop after mechanical harvesting. High ratoon yield under mechanical harvesting system has been recognized as one of the most important characteristics of sugarcane cultivar in the Kumage region where ratoon yield has been decreasing for recent years. “Harunoogi” is expected to play an important role in recovery from a decline of sugarcane yield in the region.「はるのおうぎ」は，農研機構九州沖縄農業研究センターおよび国際農林水産業研究センターが共同育成した，萌芽 性に優れる株出し多収のサトウキビ品種である．鹿児島県熊毛地域を普及見込み地域として 2019 年 3 月に品種登録出願した．本品種は，サトウキビ製糖用品種と野生種との種間雑種で株出し多収性を特徴とする飼料用サトウキビ品種KRFo93-1」を種子親，早期高糖性を特徴とする製糖用品種「NiN24」を花粉親とする交配に由来し，株出し多収性と高糖性を重視した選抜を経て育成された．萌芽性は “ 極高 ” であり，萌芽率は熊毛地域の主要品種「NiF8」を常に上回る分げつ性は “ 強 ” であり，熊毛地域では原料茎数が「NiF8」の 1.4 倍から 2.0 倍に達する．一茎重は「NiF8」より軽いが茎数が多いため，原料茎重は春植え，株出しともに「NiF8」に比べて多い．甘蔗糖度は「NiF8」と同程度である．原料茎重と甘蔗糖度の結果から，可製糖量は春植え，株出しともに「NiF8」を大きく上回る．また，耐倒伏性に優れるため機械収穫しやすく，機械収穫後の萌芽も良好である．株出し単収が減少傾向にある熊毛地域において，単収の回復に寄与することが期待され