CAJ | 학술논문

2011年1~4月,分3个航次对海南岛北部海口湾和南部陵水新村湾的尿素浓度和浮游生物脲酶活性开展调查研究,结合相关理化环境因子,比较分析海南岛南北部近岸海湾冬、春季尿素的可利用性及对浮游植物群落的影响。结果表明,冬季(1~2月),北部海口湾尿素浓度范围(以N计,以下同)为0.93~4.13μmol/L,显著高于南部陵水新村湾0.38~2.05μmol/L。春季,海南岛南北部尿素浓度均有所升高,平均占总溶解态氮源的含量由冬季的5%~7%增加到24%~30%,变化显著,表明尿素是海南岛近岸海湾不可忽视的氮源。海南岛南北部海湾冬季大部分浮游生物样品脲酶活性低于检出限。春季,海口湾平均脲酶活性为44 nmol/(L·h)±23 nmol/(L·h),呈现近岸入海口水体高于离岸的特征；南部海湾平均脲酶活性升高到21 nmol/(L·h)±10 nmol/(L·h),新村湾养殖区水体的脲酶活性高于陵水湾。水温和浮游植物细胞丰度是影响海南岛脲酶活性冬、春季变化的重要因素。冬季,海口湾浮游植物细胞丰度显著低于陵水新村湾；春季,海口湾浮游植物细胞丰度增长到5.09×106个/L±7.45×106个/L,冬、春季变化显著。海南岛南北部硅藻和甲藻细胞丰度冬、春季的变化均与硝酸盐和DIP负相关,而与脲酶活性和水温正相关,尿素在不同程度上影响南北部细胞丰度的变化。
2011년1~4월,분3개항차대해남도북부해구만화남부릉수신촌만적뇨소농도화부유생물뇨매활성개전조사연구,결합상관이화배경인자,비교분석해남도남북부근안해만동、춘계뇨소적가이용성급대부유식물군락적영향。결과표명,동계(1~2월),북부해구만뇨소농도범위(이N계,이하동)위0.93~4.13μmol/L,현저고우남부릉수신촌만0.38~2.05μmol/L。춘계,해남도남북부뇨소농도균유소승고,평균점총용해태담원적함량유동계적5%~7%증가도24%~30%,변화현저,표명뇨소시해남도근안해만불가홀시적담원。해남도남북부해만동계대부분부유생물양품뇨매활성저우검출한。춘계,해구만평균뇨매활성위44 nmol/(L·h)±23 nmol/(L·h),정현근안입해구수체고우리안적특정；남부해만평균뇨매활성승고도21 nmol/(L·h)±10 nmol/(L·h),신촌만양식구수체적뇨매활성고우릉수만。수온화부유식물세포봉도시영향해남도뇨매활성동、춘계변화적중요인소。동계,해구만부유식물세포봉도현저저우릉수신촌만；춘계,해구만부유식물세포봉도증장도5.09×106개/L±7.45×106개/L,동、춘계변화현저。해남도남북부규조화갑조세포봉도동、춘계적변화균여초산염화DIP부상관,이여뇨매활성화수온정상관,뇨소재불동정도상영향남북부세포봉도적변화。
Field cruises were carried out on the southern and northern coastal waters of Hainan Island to survey the variation of urea concentrations and urease activities together with other environmental parameters during January to April, 2011. Results showed that the urea concentrations in the northern Haikou Bay (from 0.93μmol/L to 4.13μmol/L) were significantly higher than those in the southern Lingshui-Xincun Bay during the winter. During the April, the urea concentrations increased significantly to 24%~30% of total dissolved nitrogen, which showed that urea was as one important nitrogen source in the coastal waters of Hainan Island. The urease activities of most plankton samples in the winter were below the detection limit. In the spring, the urease activities of Haikou Bay and Lingshui-Xincun Bay increased significantly to 44 nmol/(L·h)±23 nmol/(L·h) and 21 nmol/(L·h)±10 nmol/(L·h) respectively. The urea concentrations and the urease activities in the nearshore waters where sewage draining and the aquaculture area located were higher than in the other waters. The urease activities during the winter and spring were mostly affected by water temperatures and cell abundance of phytoplankton. Cell abundances of Haikou Bay were significantly lower than Lingshui-Xincun Bay during the winter. In April, cell abundances of Haikou Bay increased significantly to 5.09 cells/L±7.45×106 cells/L. Cell abundances of diatom and dinoflagellates in the Hainan Island waters during the winter and spring were negative correlated with nitrate and DIP concentrations, while positive correlated with urease activities and water temperatures. The urea concentrations affected the variation of cell abundances at different degrees. Increasing water temperature, urease activities and urea concentrations were propitious to the growth of phytoplankton in the Hainan Island during the spring.