黄土高原水土流失区粮食现状与增产潜力研究

以黄土高原10个试区的攻关资料为基础,从区域旱作产量潜势、试区攻关水平和试区所在县的产量现状三个层次,详细剖析了黄土高原水土流失区粮食现状和增产潜力。结果指出,该区粮食增产潜力很大,目前整体产量水平仅达到试区攻关水平的74.7%,达到旱作粮食产量潜势水平的54.2%。在黄土台塬区和丘陵区中,丘陵区的粮食增产潜力较台塬区大,前者尚有117.6%增产能力,后者仅56.6%。但考虑到人口增长和坡耕地的退垦等因素,未来30年内黄土高原水土流失区的粮食供需仍处于负平衡。

On potential grain yield increase in the soil loss region of Loess Plateau

Based on the data of grain yield in ten experimental areas,the situation and potential increase of grain yield in the soil loss region of Loess Plateau were studied from three different levels of yield,which are dryland yield potential,experimental yields in ten areas and yields of ten counties.The results indicated that the potential yield increase was greater in the soil loss region of Loess Plateau,and the present yield only reached 74.7% of the experimental level in ten areas,and 54.2% of the sunlight temperature water yield potential.Comparison of dryland potential yield increase in gully and hilly regions of Loess Plateau shows that potential yield increase in hilly region is 117.6%,and only 56.6%in gully region.Owing to population increase and decrease of cultivated land in the soil loss region,the produced grain yield will not meet the need in the future thirty years.