甘肃黄土高原作物生长期土壤干旱及气候生产力特征分析

Soil arid and climate productivity over Gansu loess plateau during crop growth period

分析了近40年甘肃黄土高原区域作物生长期土壤干旱和气候生产力特征,结果表明:(1)土壤干旱和气候生产力在空间上表现为全区一致,区域内相关性很好。(2)时间演变规律上,土壤干旱有加重的趋势、气候生产力呈下降的趋势。(3)土壤干旱和气候生产力变化阶段性明显,年际变化具有3～5a的振荡,4a周期最为明显。

By investigating the soil drought and climate of Gansu loess plateau during the crop growth period in the past 40 years three facts are obtained: (1) space coherence of soil drought and climate productivity of Gansu loess plateau during crop growth period, (2) heavier soil arid and weaker climate productivity and (3) remarkable changes of soil arid and climate productivity with 3~5a, often 4a period.