海涂高位养殖系统中盐份变化特征与脱盐趋势预测

1992年开始围田囤蓄养殖,对海涂大面积引咸蓄淡高位养殖系统中池水和底泥盐份变化进行了动态研究。由1996年至2005年的测定结果表明:(1)以Na-Cl型高矿化河水(>3.5 g L-1)为抽提补充池塘水源,同时雨季池塘大面积囤蓄降水,池塘水体盐份浓度由3.67 g L-1下降至2.28 g L-1。(2)池塘底泥盐份逐年降低,1 m剖面底泥盐份由3.22 g kg-1下降至1.06 g kg-1;回归统计底泥盐份与Na+、Cl-离子相关性均达到极显著水平。(3)利用指数曲线模型预测底泥脱盐趋势,获得的后续每2 a脱盐预测值分别为δ2007=0.824g kg-1,δ2009=0.638 g kg-1,为后续旱改提供了理论依据。

SALT VARIABILITY AND DESALINIZATION TENDENCY OF AQUACULTURE SYSTEMS ON COASTAL LAND

Since 1992 when polders began to appear along the coast for aquaculture,a long-term experiment has been carried on to study dynamic variation of salts in the water and bottom mud of the polders as affected by aquaculture in Defang region.Results of the monitoring between 1996 and 2005 show 1) salt concentration in the waterbody decreased from 3.67 to 2.28 g L-1 in the aquaculture system with river water high in mineralization(Na-Cl > 3.5 g L-1) and rainfall as water sources for replenishment;2) total solubl...