首页
登录
职称英语
Fertilizer use has exploded, overloading plants worldwide, likely altering e
Fertilizer use has exploded, overloading plants worldwide, likely altering e
游客
2023-08-15
18
管理
问题
Fertilizer use has exploded, overloading plants worldwide, likely altering ecosystems for decades to centuries, scientists report Thursday. In the journal Science, a review led by Donald Canfield of the University of Southern Denmark found that fertilizer use worldwide increased 800% from 1960 to 2000. "Given the rising costs of synthetic fertilizer production, this overuse is not only economically expensive, but also initiates a series of large-scale environmental impacts," says the review.
Fundamentally, nitrogen from fertilizers has led to an explosion in "dead zones" in seas and oceans, upsetting a cycle of nutrients balanced with growth that has lasted for billions of years, the authors find. As well, the excess nitrogen is forming large amounts of nitrous oxide (一氧化二氨), a powerful greenhouse gas in wetlands, adding to climate change. Agriculture today produces about a quarter of the nitrous oxide in the atmosphere.
"The effects of humans have been profound. In the last few decades we have doubled the worldwide biological availability of nitrogen, an element that often limits growth of plants and algae," says Thomas Jordan of the Smithsonian Environmental Research Center in Edgewater, Md., who was not part of the review. The review, "is a very careful analysis of the nitrogen cycle by three of the world authorities in this area," says biochemist Robert Blankenship of Washington University in St Louis, who also was not part of the review. "The concerns they raise for how the nitrogen cycle is now significantly out of balance are important and need to be addressed by changing agricultural practices. The world’s food supply depends directly on nitrogen application in the form of fertilizer, but current practices are such that much of the applied nitrogen ends up in rivers and eventually in the ocean where it causes serious problems."
"Natural feedbacks driven by microorganisms will likely produce a new steady state over time scales of many decades," say the review authors. "However, because of the projected increase in human population through at least 2050, there will be demand for an increase in fixed nitrogen for crops to feed this population." And that will mean a lot more dead zones, they warn, like the one that blooms yearly, m 2010 about the size of New Jersey, in the Gulf of Mexico.
"Several new approaches and a much wider use of more sustainable time-honored practices, however, can decrease nitrogen use substantially," they conclude. The rising cost and environmental toll of fertilizers will increase demand for less use on farms, they add. "However, even with management, the future cycle will likely be different from the one that preceded the Industrial Revolution." [br] It is concluded in the review that______.
选项
A、the use of nitrogen will become sustainable
B、the use of nitrogen will disappear from farms
C、the demand for nitrogen will decrease
D、the demand for nitrogen will increase
答案
C
解析
最后一段第1句中的decrease…substantially和第2句中 increase demand for less use都表明研究人员认为将来对氮的需求将会下降。因此,本题应选C。
转载请注明原文地址:https://tihaiku.com/zcyy/2928165.html
相关试题推荐
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
Oldstereotypesdiehard.Pictureavideo-gameplayerandyouwilllikelyima
Oldstereotypesdiehard.Pictureavideo-gameplayerandyouwilllikelyima
Oldstereotypesdiehard.Pictureavideo-gameplayerandyouwilllikelyima
Oldstereotypesdiehard.Pictureavideo-gameplayerandyouwilllikelyima
Astherecentcourgette(密生西葫芦)crisisandshortagesoflettuce,eggplantsand
Astherecentcourgette(密生西葫芦)crisisandshortagesoflettuce,eggplantsand
Astherecentcourgette(密生西葫芦)crisisandshortagesoflettuce,eggplantsand
Astherecentcourgette(密生西葫芦)crisisandshortagesoflettuce,eggplantsand
随机试题
[originaltext]M:ArecentcaseIheardwasofamanaccusedandfoundguiltyof
[originaltext](3)ThefounderofFacebookMarkZuckerberghasannouncedthebirt
"Congratulations,Mr.Cooper.It’sagirl."Fatherhoodisgoingtohave
黄芪有“”.何首乌有“”.粉防己有“车轮纹”.大黄根茎可见“”。
试回答交通标志工程质量检验评定标准的问题。(2)交通标志标志面的实测项目有()。
超前地质预报按预报长度划分为()。A:特长距离预报:预报200m以上 B:长
职工因工致残待遇被鉴定为一至四级,应当(),发给工伤伤残抚恤证件。A:退出生产、
经济增长速度缓慢,社会资金需求相对减少,则市场利率水平下降。( )
某男,35岁,春节期间突患急性胆囊炎,症见胁痛,口苦,舌红苔黄。证属肝胆湿热,医
对于丙型肝炎下列哪项是不正确的A.急性丙型肝炎症状较轻 B.黄疸型患者仅占25
最新回复
(
0
)