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
2023-08-24
13
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(一氧化二氮), 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, in 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句中的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/2952001.html
相关试题推荐
Tobestprotectthreatenedplants,inefficientnationalparksshouldbesold
Tobestprotectthreatenedplants,inefficientnationalparksshouldbesold
Tobestprotectthreatenedplants,inefficientnationalparksshouldbesold
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringe
Commonindoorplantsmayprovetobeavaluableweaponinthefightagainst
Heavierpeoplearemorelikelytobekilledorseriouslyinjuredincaracci
随机试题
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
WarrenBuffett,whowillhostBerkshireH
A.手足口病 B.霍乱 C.流感 D.流行性乙型脑炎 E.伤寒对病人进行
雄黄炮制忌用哪种方法()A、加水研磨 B、加水球磨 C、煅后水飞
磺脲类药物最常见的不良反应是A.甲状腺功能低下 B.凝血功能障碍 C.胃肠不
患儿,男,1岁。患婴幼儿腹泻2天,泻下急迫,大便呈稀水蛋花样,有粘液及辛臭味,伴
2019年一季度,社会消费品零售总额97790亿元,同比名义增长8.3%(扣除价
甲无票乘坐公交车被发现,司乘人员将其控制在车内至终点站,令甲在调度室反省4小时。
“我劝天公重抖擞,不拘一格降人才!”出自( )的诗句。A.梁启超 B.龚自珍
球罐分带组装方法目前已较少采用,它的主要特点是( )。A.技术不成熟 B.电
最新回复
(
0
)