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Thesis Advisor刘伙泉
Degree Grantor中国科学院武汉水生生物研究所
Place of Conferral中国科学院武汉水生生物研究所
Degree Discipline水生生物学
Abstract本文列出了牛山湖47种水生高等植物名录,叙述了水生植被的分布和黄丝草有关生物学,黄丝草的是优势种类,覆盖度约占90%以上,最大生物量在9月份,全湖共253194.53吨湿重,或31649.32吨烘干重,或1.137 * 10~(11)千卡。实验表明不同大小的草鱼对黄丝草的日摄食率相差较大,但消化率差异不明显,水温在21.9-30.5 ℃下,日摄食率与温度相关方程分别为:d1 = -0.2234 + 0.0129T (r_1 = 0.97 体重 1114.3g) d2 = -0.5242 + 0.032T (r_2 = 0.92 288.8g) d3 = -0.6588 + 0.0352T (r_3 = 0.92 149.4g)选择指数表明,几种水草同时存在时,黄丝草不是草鱼喜食的种类。牛山湖草鱼生长较快,体长与体重的回归方程为:W = 0.00002033L~(2.9747)。最后,本文运用了摄食压力系数C = F/P作为判别草鱼-黄丝草系统状态的依据,并经过模拟计算出目前牛山湖草鱼合理负载量是1299.4吨,在目前的捕捞强度下,每年养69.9吨大规格鱼种,则每种可持续获得草鱼产量为524.9吨。
Other AbstractLake Niushanhu is located in Wuchang County, Hubei Province, covering an area of 40Km~2. The species distribution and types of vegetation of the aquatic vascular plants were investigated during the period of 1989-1990. A total of 47 species of macrophytes belonging to 32 genera and 22 families were recorded. In general, the vegetation in the lake is dominated by Potamogeton maackianus which occupies approximately 90 percent of the lake area, almost comprising entire standing crop of the macrophytes. Experimental results indicate that the daily consumption rate of grass carp varies with water temperature and body weight of the fish, and the selectivity indices of the fish for P. maackianus were negative calculated by means of Ivlev's formula. Grass carp is in good conditions in lake Niushanhu. Its length-weight relationship may be given as W = 0.00002033L~(29747). The dynamic relationships between grass carp and P. maackianus are discussed in details. Coefficient of feeding pressure, C = F/P, was employed to demonstrate the state of grass carp - P. maackianus system. The rational carrying capacity and the optimum sustainalbe yields of grass carp are estimated as 1299.4 and 524.9 tons respectively, if 69.9 tons of large-sized fingerlings of grass carp were stocked every year.
Document Type学位论文
Recommended Citation
GB/T 7714
温周瑞. 牛山湖水生植被及草鱼合理负载量的研究[D]. 中国科学院武汉水生生物研究所. 中国科学院武汉水生生物研究所,1990.
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