Incident of rice of near future cadmium, let pollution of heavy metal of farmland of focusing of people general look. Data shows, our country suffers the farmland area that heavy metal pollutes to already amounted to 20 million hectare, occupy the 1/6 of area of countrywide total farmland, situation of prevention and cure is very grim, and still present the trend of ceaseless aggravate. According to estimation, if have repair to these farmland, demand capital will be counted yuan. Plus our country rehabilitate of incomputable, soil is at present relevant by soil contamination law and standard are short of break, heavy metal of our country farmland pollutes repair shoulder heavy responsibilities.
Heavy metal of countrywide 1/6 farmland is polluted
Exceed mark rice incident by Hunan cadmium, people is informed, a large number of farmland suffer Hunan already heavy metal pollution.
The message that pollutes about farmland heavy metal in recent years incessant Yu Er. The Chinese soil that pays close attention to problem of our country soil contamination for a long time learns vice-president Zhang Wei to manage to ever expressed, current, our country soil contamination is shown with each passing day the posture of aggravate, situation of preventiothe most popular selling norton internet antivirusn and cure is very grim.
According to media coverage, the portion ever represented Luo Xiwen of academician of Chinese Academy of Engineering in October 2011, what 300 million mus of farmland of countrywide are being polluted by heavy metal is minatory, occupy the 1/6 of countrywide farm gross. Document of environmental protection department shows, be opposite 300 thousand hectare of our country is basic soil of farm groove guard is harmful heavy metal samples the discovery when monitoring, have 3.6 heavy metal of soil of 10 thousand hectare exceeds bid, rate exceeding bid is amounted to 12.1% . Statistic of ministry of land natural resources makes clear, at present the whole nation cultivates the 10% above of land area already sufferred heavy metal to pollute.
north face shirtsFarmland is polluted an influence by heavy metal serious, researcher of place of division into districts resource of academy of sciences of agriculture of the member that heavy metal of soil of producing area of produce of Ministry of Agriculture pollutes expert of prevention and cure to comprise, China and Dr. Chen Shibao is right " economic reference signs up for " the reporter expresses, the immediate consequence that farmland of heavy metal pollution brings is farmland quality drop, the character that brings about produce and quality drop, exit suffers be restricted, bring potential harm to human body health at the same time.
A statistic shows environmental protection branch, the commissariat that the whole nation pollutes every year because of heavy metal is as high as 12 million tons, the immediate pecuniary loss that cause exceeds 20 billion yuan.
"Our country soil contamination wants than each national capital now serious, add the contaminative trend of drama to may last 30 years even increasingly. " Chinese agrology expert, nanjing agriculture college teachs Pan Genxing to ever was made say or state with certainty so. He expresses, pollute accentuation not only, and still diffuse in move.
Repair capital requirement exceeds several yuan
Environment of Guangdong province zoology and field of Chen Neng of edaphic institute researcher put forward: "Want to take step as soon as possible, undertake to having the farmland that gets pollution repair is handled.
Compare with atmosphere and water pollution photograph, edaphic rehabilitate appears more difficult. Su Dechun of resource of college of agriculture of the member that heavy metal of soil of producing area of produce of Ministry of Agriculture pollutes expert of prevention and cure to comprise, China and environmental college professor expresses, not only soil contamination harm is serious, and differ with a few organic contaminant, the heavy metal in soil cannot degradation, as detached as soil difficulty is very great, repair is very difficult.
spring poolScience of geography of the Chinese Academy of Sciences and Chen Tongbin of director of research center of rehabilitate of resource institute environment ever also expressed, even if the place that spends pollution gently, should get rid of the heavy metal in soil also wants the most quickly 3 to 5 years.
"Theoretic say, soil of heavy metal pollution is OK by repair, but it is very difficult to restore its zoology function completely. " Chen Shibao is right " economic reference signs up for " the reporter expresses, current, the repair measure that world each country offers in the light owatch casesf soil of heavy metal pollution has a lot of kinds, contaminative soil rehabilitate basically incorporates two big principles: Keep within limits (In-aiturem Ediation) and purify (Rem Ove, ex-situ) , be based on afore-mentioned two big principles, contaminative soil rehabilitate basically has segregation bag to bury, drip washing of earth of the solidify stability, depart that heat up smelt metal, chemical stability, dynamoelectric rehabilitate, guest and dig, soil and biology rehabilitate (include plant rehabilitate) , but every kinds of measure is put in certain applied limitation, exist more or less other issue, it is the technical difficulty that overcomes hard even a little among them. "Once heavy metal enters soil, reentry travel rehabilitate is very difficult, need costs many time and funds. " Chen Shibao says.
Rehabilitate of soil of county of rich hill of 70 time Japan is above century exemple, altogether 863 hectare (12945 mus) farm, invest 340 million dollar in all, cost 33 years of time to undertake rehabilitate of guest indigenous method is finished, average expenses of every mus of repair is close 180 thousand yuan of RMBs.
Notable is, japan is 0.4m G/kg to the standard of cadmium set limit to of rice, and value of set limit to of rice of our country cadmium is 0.2m G/kg only, healthy risk control is to should father at other developed country, standard of set limit to of the cadmium in rice is severe, the quality standard of the cadmium in meaning soil is corresponding also the ground is firm. Chen Shibao expresses, pollute edaphic rehabilitate case with Japanese cadmium for, if according to standard of cadmium of our country rice, so repair cost and time will be more giant, repair measure is more difficult also.
The expert expresses, opposite for, in edaphic repair process, cost of guest indigenous method is higher. But disclose according to the personage inside course of study, although adopt cheaper way to be like soil of rehabilitate of plant rehabilitate law, every mus repfree norton internet antivirusair cost also achieves 20 thousand yuan, still need to cultivate several years continuously, total devoted number is astonishing. If according to cost of rehabilitate of every mus of ground 20 thousand yuan, what call the whole nation compharrison hot spring dealutation of pollution of heavy metal of 300 million mus of farmland with Luo Xiwen, overall calculate come down, overall place requires repair of our country farmland cnorton internet antivirusapital will amount to 6 trillion yuan.
Urgent affairs is control fountainhead pollution
Look in the expert, at present very difficult beforehand rehabilitate of farmland of appraise our country needs how many time and investment. Chen Shibao thinks, rehabilitate of specific pollution soilvancouver to harrison hot springs needs how long, should combine pollution area of sort of element of degree, pollution, pollution, adopt He Chongxiu answer measure, additional, the repair target that makes according to place even, cannot treat as the same.
The reporter understands, 2006, ministry of national environmental protection and ministry of land natural resources organized a cost 1 billion, national soil contamination of 3 years investigates by a definite date, but up to now findings was not announced to the public from beginning to end.
"We have now too much sealed. " Su Dechun expresses, above all, area of sort of element of the rate that our country farmland gets heavy metal to pollute, pollution, pollution all is sealed; Next, our repair target after all how? How to just consider repair good? Be the edaphic secondary standard that achieves national regulation? Still say the heavy metal set limit to that achieves crop mfree modern dining chairserely is worth?
The expert expresses, because soil contamination bottom is incomputable, bring about contaminative reason, phyletic, limits and degree to also become blind spot, meafree watch casesure of prevention and cure also lacks specific aim accordingly.
"The question on the technology is not big, but repair capital is brushstroke for certain gigantic endowment, this money goes by who, also be a big question. " Chai Fage of assistant dean of academy of Chinese environment science is right " economic reference signs up for " the reporter says.
It is reported, basis " countrywide soil environmental protection " 925 " plan " , "925 " during, with the central finance that pollutes edaphic rehabilitate at the whole nation capital will amount to 30 billion yuan, include to get contaminative farm, town " brown plot " the mining area that reach worker worker contaminates ground " this bit of money, come the farmland that repair heavy metal pollutes, slit between the teeth of a place of strategic importance is insufficient! " say of a personage inside course of study.
Be aimed at the rehabilitate that farmland pollutes, su Dechun suggests, pollute a circumstanceharrison hot spring public pool according to having farmland, cent is spend gently, in spend and spend pollution again, and the situation with different basis, adjust cultivate system and cultivate structure, "Current condition, can be the production side edge rehabilitate only. " Chen Neng field thinks, drive by rehabilitate of contaminative farm soil, standard of the legal laws and regulations that is badly in need of management of environment of soil of perfect our country currently, technology and standard system.
The experts inside course of study think consistently, urgent affairs is control fountainhead pollution. "In prevention and cure of heavy metal polluthe best selling modern dining chairstion, beard fountainhead controls ——— process block to break ——— extreme to govern photograph union, among them, fountainhead control is crucial. The way that the economy that after ten million should prevent to go to be polluted first again, administers grows. This also is one of core content of the zoology culture that at present our country place promotes. " Chen Shibao says.
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