森林可以吸收大量的 CO 2 , 而森林土壤是 CO 2 产生的重要来源 , 土壤 CO 2 主要来自于微生物呼吸、植物根呼吸和土壤动物呼吸。某科研小组对武夷山同一海拔、同一坡向、同一优势树种 ( 米槠林 ) 的土壤进行了研究 , 结果如图所示。 据此完成下面三题。 森林土壤 CO 2 排放速率与土壤温度、土壤含水量和枯枝落叶量的关系示意图 同海拔、同树种的武夷山东坡比西坡的土壤CO2排放量大,其主要原因是( )
A.
降水较多
B.
蒸发较大
C.
气温较高
D.
枯枝落叶较多
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举一反三
【单选题】Patrick lives near two gas stations, Exxon and Shell. If Exxon decreases the price of gas, we predict that the quantity of gasoline demanded at Shell will
A.
decrease because Exxon and Shell gas are complements.
B.
decrease because Exxon and Shell gas are substitutes.
C.
increase because Exxon and Shell gas are substitutes.
D.
increase because Exxon and Shell gas are complements.
E.
not change Exxon and Shell are different brands of gasoline.
【单选题】Exxon and Chase Manhattan Bank reached an agreement. In the next two years, Exxon would pay fixed price of oil to Chase Manhattan Bank on June 30, and Chase Manhattan Bank would pay floating price of ...