对虾高位池精养和生态养殖模式下沉积物中碳、氮元素变化及对底栖细菌的影响

本文采用原位生态学研究方法分析两种较为典型的对虾养殖模式—高位池精养模式和生态养殖模式沉积物中碳、氮元素的变化和其对底栖细菌的影响.结果表明:(1)在两种养殖模式下沉积物中碳元素含量都是呈上升趋势,高位池精养模式中C∶N值呈下降趋势,而生态养殖模式中C∶N值则呈上升趋势.(2)底栖细菌的呼吸量及其生物量变化呈显著正相关.单位生物量的底栖细菌代谢力变化和沉积物中C∶N值有关.在高位池精养模式中,沉积物C∶N值较高(＞16.59),单位生物量底栖细菌代谢力保持恒定;在生态养殖模式中,沉积物C∶N值较低(＜15.58),单位生物量底栖细菌代谢力随C∶N值的上升而增加.

Quantification of Carbon, Nitrogen and Bacterial Carbon Metabolism in the Sediment of the Intensive and Ecological Shrimp Culture Model

Two typical shrimp culture models were selected to analyze the variation of contents of C and N in sediment,and their effects on the carbon metabolism of sediment bacteria in this study.The results showed that:(1) The content of C increased gradually during the culture period in both models.The C∶N ratio gradually decreased during the culture period in the intensive culture model,but it had an increasing trend in the ecological culture model.(2) The carbon metabolism of sediment bacteria was positively correlated with their biomass.The carbon metabolism per biomass of sediment bacteria was related to the ratio of C∶N in the sediment of the intensive culture model,the C∶N ratio was higher than 16.59 and the unit carbon metabolism remained stable.While in the ecological culture model the unit carbon metabolism increased together with the C∶N ratio which was lower than 15.58.