官司河流域农业自然生产潜力研究

Study on Agricultural Physical Potential Productivity in Guansi Basin

选取四川省绵阳市官司河流域为研究对象,采用农业自然生产潜力阶乘修正模型,综合分析光照、热量、降水、土壤等主导环境因素,对研究区水稻、小麦、玉米3类主要粮食作物的农业自然生产潜力进行估算。结果表明,就订正系数而言,温度对光合生产潜力的影响较小,光温生产潜力接近光合生产潜力;降水对光温生产潜力的平均订正系数为74%,土壤因子对气候生产潜力的订正系数为63%。就3类粮食作物的农业自然生产潜力而言,水稻为10785.22kg/hm2,小麦为6653.01kg/hm2,玉米为9586.26kg/hm2。官司河流域不同作物间增产潜力存在明显差异,由大到小依次为玉米>小麦>水稻,表明该区域可挖掘的农业自然生产潜力空间较大,据此提出了提高农业自然生产潜力的有效措施和增产途径。

Guansi Basin which was the major protection forest construction region in the upper of the Yangtze River was selected as the study object, synthetically sun light, heat, precipitation and soil as the key environmental factors were analyzed by using factorial modified model to calculate the agricultural physical potential productivity on three kinds of main crops（rice, wheat and corn）in the region. The results showed that temperature had small impact on the photosynthetic potential productivity. It meant that light ＆ temperature potential productivity approached to photosynthetic potential productivity. The amendment parameter precipitation for light ＆ temperature potential productivity was 0.74; and soil factors for climate potential productivity was 0.63. The physical potential productivity of rice, wheat and corn were 10 785.22 kg/hm^2, 6 653.01 kg/hm^2 and 9 586.26 kg/hm^2. The yield increasing potentiality between different crops had obvious difference in Guansi Basin, from larger to little as corn〉wheat〉rice.