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行業動態 行業動態

農村水污染為何如此嚴重? 面源污染是“罪魁禍首”

2015-04-23 作者: 瀏覽數:977

  4月16日國務院發布了(le)《水(shui)(shui)(shui)污(wu)染(ran)防(fang)治行(xing)動計劃》,農(nong)(nong)村(cun)(cun)(cun)水(shui)(shui)(shui)污(wu)染(ran)防(fang)治是(shi)其中的(de)(de)重(zhong)要(yao)內容(rong)。中國社(she)會科學(xue)院農(nong)(nong)村(cun)(cun)(cun)發展(zhan)研究(jiu)所(suo)研究(jiu)員李國祥指(zhi)出,農(nong)(nong)村(cun)(cun)(cun)水(shui)(shui)(shui)污(wu)染(ran)不僅(jin)直接危害(hai)農(nong)(nong)民(min)生產生活,而(er)且(qie)還影(ying)響農(nong)(nong)業的(de)(de)可持續發展(zhan),進而(er)加(jia)劇國家糧(liang)食安全(quan)風險隱(yin)患(huan)和食品(pin)安全(quan)風險隱(yin)患(huan),關(guan)系(xi)到我們每個人(ren)。“防(fang)治農(nong)(nong)村(cun)(cun)(cun)水(shui)(shui)(shui)污(wu)染(ran),既是(shi)建設美麗鄉村(cun)(cun)(cun)的(de)(de)迫(po)切需要(yao),更是(shi)提(ti)升城鄉居民(min)生活質(zhi)量的(de)(de)重(zhong)要(yao)保障。”

  李國(guo)祥指出(chu),農(nong)(nong)村(cun)(cun)水(shui)(shui)污染(ran)(ran)源頭呈現出(chu)多樣化態勢。“我(wo)國(guo)農(nong)(nong)村(cun)(cun)曾經(jing)普遍是(shi)水(shui)(shui)美(mei)魚(yu)肥的地方(fang),無論是(shi)河里(li)(li),還(huan)是(shi)池塘(tang)(tang)里(li)(li),都(dou)能捕(bu)到(dao)(dao)魚(yu),甚至一些地方(fang)農(nong)(nong)村(cun)(cun)池塘(tang)(tang)的水(shui)(shui)或者井(jing)水(shui)(shui),飲用(yong)后還(huan)讓人有(you)甘甜的回味。如(ru)今(jin)我(wo)們到(dao)(dao)農(nong)(nong)村(cun)(cun)去調查(cha),再(zai)見(jian)到(dao)(dao)水(shui)(shui)美(mei)魚(yu)肥的地方(fang)已(yi)經(jing)很難了(le)(le),一些地方(fang)的地表水(shui)(shui)又黑又臭,魚(yu)兒(er)不見(jian)了(le)(le)蹤影(ying),根本不能供(gong)人直接飲用(yong),農(nong)(nong)村(cun)(cun)水(shui)(shui)體已(yi)經(jing)污染(ran)(ran)很嚴重了(le)(le)。”

  農(nong)(nong)村水(shui)污(wu)(wu)染為(wei)什么會如此嚴重?李國(guo)祥認為(wei),農(nong)(nong)業(ye)面(mian)源(yuan)污(wu)(wu)染是(shi)農(nong)(nong)村水(shui)污(wu)(wu)染的“罪魁禍首”。所(suo)謂農(nong)(nong)業(ye)面(mian)源(yuan)污(wu)(wu)染,就(jiu)是(shi)濫用(yong)農(nong)(nong)業(ye)化(hua)(hua)學投入物(wu)和(he)不當處置農(nong)(nong)業(ye)副(fu)產品(pin)等所(suo)造成的對(dui)農(nong)(nong)村資源(yuan)和(he)環(huan)境(jing)污(wu)(wu)染,包括(kuo)對(dui)土壤、水(shui)體(ti)和(he)空氣(qi)等的污(wu)(wu)染。但(dan)就(jiu)水(shui)體(ti)來說,現代農(nong)(nong)牧業(ye)生產中濫用(yong)化(hua)(hua)肥、農(nong)(nong)藥和(he)獸藥,隨意處置農(nong)(nong)作物(wu)秸稈和(he)畜禽(qin)排泄物(wu),都可能是(shi)污(wu)(wu)染源(yuan)。

  “我們經常說(shuo)中(zhong)國(guo)用(yong)(yong)不(bu)足世界(jie)(jie)10%的(de)耕(geng)地養(yang)(yang)活了(le)超(chao)過(guo)世界(jie)(jie)20%的(de)人口。這話不(bu)錯(cuo),我國(guo)農(nong)(nong)業(ye)(ye)發展(zhan)確實(shi)讓我們徹底告(gao)別了(le)農(nong)(nong)產品短缺(que)時代,我們不(bu)再(zai)為缺(que)衣少食而犯愁。但(dan)(dan)我們也必(bi)須(xu)清醒認識到我國(guo)農(nong)(nong)業(ye)(ye)施(shi)用(yong)(yong)的(de)化肥(fei)量(liang)超(chao)過(guo)世界(jie)(jie)30%。”李(li)國(guo)祥說(shuo),農(nong)(nong)業(ye)(ye)上施(shi)用(yong)(yong)的(de)大量(liang)化肥(fei),一部(bu)分讓植物吸(xi)收(shou)后變成了(le)莊稼的(de)營養(yang)(yang),但(dan)(dan)還有一部(bu)分沒(mei)有被吸(xi)收(shou),通過(guo)雨水沖刷(shua)或(huo)者其他流(liu)水等途徑滲透(tou)到地下或(huo)者融(rong)入到地表(biao)水中(zhong),將水體污染(ran)。我國(guo)農(nong)(nong)藥、獸(shou)藥和(he)魚藥等用(yong)(yong)量(liang)也相當(dang)多,雖然(ran)防治了(le)病蟲害和(he)動物疫病,但(dan)(dan)也與化肥(fei)有相似的(de)污染(ran)水體隱患。

  李國(guo)祥指出,我(wo)國(guo)已經(jing)成為世界上多數農(nong)(nong)產品生產的第(di)一大(da)國(guo),不(bu)僅農(nong)(nong)業(ye)化(hua)學投(tou)入物(wu)(wu)種類(lei)多數量大(da),而且農(nong)(nong)作(zuo)(zuo)物(wu)(wu)秸(jie)稈和動物(wu)(wu)糞(fen)(fen)便(bian)規(gui)模也很(hen)龐大(da),不(bu)好處理。過(guo)去農(nong)(nong)民(min)通常會(hui)將(jiang)秸(jie)稈作(zuo)(zuo)為生活燃料,而如(ru)(ru)今農(nong)(nong)民(min)也用(yong)上電力和液(ye)化(hua)氣(qi)等清潔能源。每(mei)當到農(nong)(nong)作(zuo)(zuo)物(wu)(wu)收獲季節,農(nong)(nong)民(min)如(ru)(ru)果無法將(jiang)秸(jie)稈資源化(hua)利用(yong)時就(jiu)會(hui)一燒了之,或者隨(sui)(sui)意直接(jie)丟棄到附近的水體(ti)中(zhong),或者堆放在路旁最終腐爛經(jing)流水進(jin)(jin)入水體(ti)中(zhong)。過(guo)去農(nong)(nong)民(min)養殖畜禽,會(hui)將(jiang)它們(men)的糞(fen)(fen)便(bian)作(zuo)(zuo)為農(nong)(nong)家(jia)肥加(jia)以(yi)利用(yong),而如(ru)(ru)今農(nong)(nong)民(min)養殖規(gui)模很(hen)大(da),是(shi)專(zhuan)業(ye)化(hua)養殖,可(ke)能不(bu)再(zai)需要(yao)農(nong)(nong)家(jia)肥,就(jiu)直接(jie)將(jiang)畜禽糞(fen)(fen)便(bian)排(pai)入水體(ti)中(zhong),或者隨(sui)(sui)意堆放也可(ke)能經(jing)流水進(jin)(jin)入水體(ti)中(zhong)。秸(jie)稈和糞(fen)(fen)便(bian)都可(ke)能成為農(nong)(nong)村(cun)(cun)水體(ti)污(wu)染(ran)源,是(shi)造成農(nong)(nong)村(cun)(cun)地(di)表水又黑又臭(chou)的主要(yao)根源。農(nong)(nong)村(cun)(cun)水污(wu)染(ran)的來源還可(ke)能是(shi)農(nong)(nong)民(min)將(jiang)病死(si)的動物(wu)(wu)隨(sui)(sui)意扔進(jin)(jin)水體(ti)中(zhong)形成的腐爛。

  “當然,農(nong)村(cun)(cun)工業(ye)化和(he)農(nong)民生活(huo)也(ye)是(shi)不可忽視(shi)的農(nong)村(cun)(cun)水污(wu)染(ran)來源。”李國祥說,農(nong)村(cun)(cun)水污(wu)染(ran),惡化了農(nong)村(cun)(cun)環境,破壞(huai)了農(nong)村(cun)(cun)生態,直接(jie)危害農(nong)民生活(huo)用水安全和(he)農(nong)業(ye)用水安全。防(fang)治農(nong)村(cun)(cun)水污(wu)染(ran)刻(ke)不容緩。

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