气候变化对旱地作物生产的影响

THE IMPACTS OF CLIMATIC CHANGE ON PRODUCTION OF DROUGHT LAND CROPS

通过ＣＯ＿２浓度对旱地作物生长发育、产量影响的人工模拟试验及田间试验得到以下结果：ＣＯ＿２浓度升高加快了作物发育历程，有利于干物质的积累，籽粒产量增加；温度升高使早地作物发育历期缩短，温度升高在一定范围内对籽粒产量是正效应，升温幅度超过２℃时，即使ＣＯ＿２浓度倍增，春小麦的籽粒产量也呈下降趋势；ＣＯ＿２浓度升高不利于籽粒蛋白质和氨基酸的形成。

Through the artificial simulation experiments and field trails for the impacts of CO_2concentration on growth、development and yield of drought land crops,the results showthat:(1)the high CO_2 concentration would speed up the crop development course ,it isfavourable to dry matter accumulation and grain yield increasing;(2)the temperaturerise would shorten the development duration of drought land crops ,and in a certainrange,it shows a positive effect on grain yield;(3)if the temperature rise range exceeds2℃, the grain yield of spring wheat would decrease even if the CO_2 concentration isdoubling, It is because CO_2 concentration rise is not favourable to grain protein andamino acid formation。