气候对农业生态系统生产力的贡献

THE CONTRIBUTION OF CLIMATE TO THE PRODUCTIVE FORCES IN AGRO-ECOSYSTEMS

在重庆地区,气候对农业生态系统生产力的贡献,丘陵比低山高12%(经济肥力)和30%(自然肥力),并推测出气候组合因子对农业生态系统生产力贡献的最佳值限.

Maize hybrid “Va 35x1” was grown in a pot trial in five soils at two locations(hilly re-gion,alt.250 m and low-mountainous region,air,550 m)in Chongqing in 1981 to evaluatethe contribution of climatic factors to the productive forces of agro-ecosystems.The datacollected were subjected to“analysis of corresponding factors”.It was found that the con-tribution of climate was 30% more to natural fertility and 12% more to economic fertilityin hilly regions than in low mountains.The critical values of monthly sum of daily meantemperature,monthly precipitation and monthly sum of hours of sunshine were estimatedto be>550°,100 mm and 130 hours,respectively.