林网保护区冬小麦生长过程的数值模拟

Numerical simulation of winter wheat growth in a regular windbredk system.

给出了一个模拟冬小麦生长过程的产量生态学模式 ,并对黄淮海平原林网保护区冬小麦的生长过程进行了数值模拟 .模型输出变量包括作物的叶面积指数 ,根、茎、叶、籽等地上和地下器官生物量 ,以及与作物生长密切相关的土壤水分变化情况、作物水分利用率、光合 /呼吸效率等生理生态因子 .结果表明 ,由于林网地区小气候条件的改善 ,使得农林复合系统较之单作农田有更强的抗旱能力 ,在干旱的 1 994年 ,林网保护下的农林复合系统生产力较单作农田提高 1 1 .6%左右 .

An ecological model simulating the process of winter wheat growth is established, and used to do numerical simulation on its growth process with and without the protection of windbreaks. The outputs of the model include the eco physiological factors which are closely associated with crop growth, such as leaf area index, biomass of various plant organs(root, leaves, stems, and storage organs),dynamics of soil water content, water utilization efficiency, photosynthesis efficiency, respiration efficiency, and so on. The results show that due to the improved microclimate in the windbreaks, the agro forestry mixed system in windbreak areas has a stronger drought resistance than the monoculture system. In the droughty year of 1994, the simulated yield in windbreak areas is about 11.6% higher than that under monoculture conditions, and the simulated above ground yield fits quite well with the field growth monitoring data.