| 基于环境水力学的产漂流性卵鱼类早期资源量估算方法改进 |
| An Instantaneous Point-Source Diffusion Model for Pelagic Eggs for Estimating Early Life Stage Fish Resources |
| 投稿时间：2015-08-14 修订日期：2016-07-01 |
| DOI：10.15928/j.1674-3075.2016.03.012 |
| 中文关键词:环境水力学 早期资源量估算 漂流性卵 瞬时点源扩散 |
| 英文关键词:environmental hydraulics estimation of early resource fish with pelagic eggs instantaneous point source diffusion |
| 基金项目:国家“十二五”科技支撑课题（2012BAC06B04）；国家自然科学基金青年项目(51409280)；国家自然科学基金面上项目（51379218） |
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| 全文下载次数: 1986 |
| 中文摘要: |
| 针对鱼类早期资源量估算方法误差大的问题，基于环境水力学，建立鱼卵移流扩散的瞬时点源二维模型，并对模型进行参数选取、守恒验证，分析了鱼类早期资源量传统估算方法的误差，提出一种新的基于环境水力学的产漂流性卵鱼类早期资源量估算方法。结果表明，鱼类早期资源的分布规律与河流的水力特性有密切关系。中心产卵群体，从产卵点到下游约80km范围内的断面，鱼卵密度呈钟形分布，由传统方法估算得到的早期资源量低于真实值，最大误差为17.5%；对于近岸产卵群体，从产卵点到下游约200 km范围内的断面，鱼卵密度随距离增加呈指数下降，由传统方法估算得到的资源量高于真实值，最大误差为-33.9%；当断面鱼卵密度均匀分布，即中心产卵和近岸产卵时，产卵场下游80 km和200 km后的断面鱼卵密度沿断面分布均匀，传统方法估算结果较为准确，不必进行校正。改进的估算方法可用于计算产漂流性鱼卵的鱼类早期资源量。 |
| 英文摘要: |
| Research on the early life history of fish is important for conservation and management of fishery resources. The large body of research on the early life history of fish at home and abroad focuses mostly on estimating fish resources based on monitoring data, often resulting in large errors for estimates of fish eggs. To better estimate the larval reserves of fish, pelagic eggs were selected as the subject of this study. A hydrology based, two-dimensional instantaneous point source model for diffusion of fish eggs by advection was developed for estimating pelagic egg numbers and their spatial distribution. After parameter selection and model validation, the distribution of pelagic fish eggs was estimated in the Luohuang section of the Yangtze River (Chongqing City), spawning grounds of the four major Chinese carp. The results were compared with those from the traditional approach for estimating fish larval resources and errors for the two methods were analyzed. Results show that the distribution of fish eggs is closely related to the river’s hydrologic characteristics. For fish spawning at the center of the river, the cross-sectional distribution of fish eggs is bell-shaped from the spawning point to 80 km downstream and the larval resource calculated using the traditional approach was higher than the true value, with a maximum error of 17.5%. For fish spawning near shore, fish egg distribution decreases exponentially along the cross section (single-tailed) from the spawning point to 200 km downstream and the larval resource calculated by the traditional approach was lower than the true value, with a maximum error of -33.9%. The calculation results of the larval resources were more accurate at the section farther than 80 km for fishes spawning at the center of the river and 200 km for fishes spawning near the bank where the fish eggs distributed uniformly. In summary, the approach proposed in this paper can improve estimates of early life-stage fish resources. |
| 任杰,彭期冬,林俊强,董国栋.2016.基于环境水力学的产漂流性卵鱼类早期资源量估算方法改进[J].水生态学杂志,37(3):82-87. |
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