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蓝线规划有利于河流廊道的生态恢复与重建
2017-08-22 03:41:35 中国青年网
张学权认为 “河长制”下的“活水成都”建设就是要恢复和重建河流的生态功能,让河流“活”起来,让河水变清澈,让城市、乡村因河流而美丽。
成都治水十条中,提出要加快完成蓝线规划,拆除河道两岸违法建筑,打造宜居水岸、活水成都。张学权表示,加快“蓝线规划”,对河流廊道的生态恢复与重建具有积极意义。“廊道作为景观的重要结构成分之一,是景观中不同于两侧基质的狭长地带,行使着资源功能、通道功能、屏障功能、防护功能和美学功能。”因此,河流廊道的重要性可见一斑,张学权提到,河流廊道是水生、陆生的交界面,包括河床、河漫滩、堤坝和部分岸上高地,是河流两侧与环境基质相区别的带状植被。不仅具有生物保护功能,还有保护水资源和环境完整性等多种生态功能,河岸植被缓冲带能够通过吸附、滞留、分解等方式有效地过滤地表营养元素对水体造成的污染。建设河流生态廊道可为居民提供更多亲近自然的机会和更多游憩休闲场所,还可成为维持生物多样性的重要“基地”。同时,河岸也构成了城乡优美的景观。
“恢复和重建河流廊道生态功能刻不容缓”。据研究,当河岸植被宽度大于30m时,能够有效降低温度、增加河流生物食物供应和有效过滤污染物;当宽度大于80-100m时,能有效控制沉积物及土壤元素的流失,并形成较高的生物多样性。
成都晚报见习记者 何海燕
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