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空心菜对入星云湖河水的净化及其生物产出分析

DOI: 10.11654/jaes.2015.02.022

Keywords: 空心菜 浮床 星云湖 入湖河水 净化效果 生物产出

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Abstract:

为充分开发利用入星云湖河水的N、P等营养资源,降低其富营养化水平,改善和保护星云湖生态系统,于2010-2013年采用微区试验与大区试验相结合、静态试验与动态试验相结合的方法,研究了漂浮空心菜(Ipomoea aquatica)对入星云湖河水净化及其生物产出的规律.结果表明:漂浮空心菜对入湖河水具有较好的水质净化效应,静态条件下空心菜对入湖河水全N、水溶性P的去除率高达90%以上,动态条件下则达50%左右,空心菜吸收入湖河水N、P、K的量分别平均为348.4、50.9、530.4 kg·hm-2·a-1,且其绝大部分被空心菜的茎叶吸收(占93.0%,为864.5 kg·hm-2·a-1).空心菜对入湖河水的净化量,以水溶性N计平均为27 321 m3·hm-2·a-1,以水溶性P计平均为67 569 m3·hm-2·a-1;空心菜的生长主要依赖入湖河水中N、P等营养物质(两者呈正相关),通过茎叶大量吸收并同化入湖河水中的N、P等养分后,空心菜获得了较高的茎叶生物产出量(占90.9%,鲜重量平均为112 032.0 kg·hm-2·a-1).利用入星云湖河水漂浮种植空心菜,产生了明显的生态效益和经济效益

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