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星期日檔案
東江上游的藍綠藻濃度,每年上升,是甚麼污染了河水? 學者估計,因為惠州水土流失嚴重,令泥土的礦物質,或農田的肥料流入河流,造成污染。水土流失,除了因為大量砍伐樹木,竟然還因為種樹。廣東省由八十年代開始,大量種植桉樹,因為桉樹種植四至七年,即可成林,木材鬆軟適宜造紙,為農民帶來豐厚收入。但種桉樹,先要「煉山」,即是把原本的山林灌草,砍盡燒盡,再種植桉樹。桉樹呈傘狀,林層結構簡單,在暴雨下儲水及阻水的能力,只有天然林木的三分一,令水土容易流失。 種樹種出禍,部分縣巿近年已經停止種植桉樹,但村鎮農民,仍然繼續燒山種樹,因為桉樹養活了不少農戶。農民問,要生態,還是要飽飯?東江水源又怎樣做到無臭無害? 記者:鄭思思
Video Length: 0
Date Found: July 04, 2011
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