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利用计算机统计分析了广东十二个县的农业生态系统结构与城乡作用相对强度指数(RSI)的关系。结果表明:城乡作用的正效应表现在扩大化肥、农药、电力等社会资源的输入;提高水稻、甘蔗、塘鱼的亩产量;扩大活鱼、生猪、家禽等鲜活商品生产能力方面。分析还表明,粮食和饲料的土地需求限制着经济作物的增长,粮食和饲料的供应也制约着禽畜的发展。在人多地少地区,粮食、饲料的供应通过增加复种、提高单产以及增加甘薯、小麦种植面积来解决。不与粮食争地、商品率高的茶叶、果树、热作、海洋渔业生产已形成与当地生态条件协调的较集中分布。离城较远的区域、山地、草坡、滩涂资源的保护、改造、利用还不充分,文章还讨论了城市作用梯度概念在布置农业,发展生产中的作用。
The relationship between agroecosystem structure and relative intensity index (RSI) of urban and rural areas in twelve counties of Guangdong was analyzed by computer statistics. The results show that the positive effects of urban and rural areas are manifested in expanding the input of social resources such as fertilizers, pesticides and electricity, improving the yield per mu of rice, sugar cane and pond fish, and expanding the production capacity of fresh fish, live pigs and poultry. The analysis also shows that demand for land for food and feed limits the growth of cash crops and that the supply of food and feed also constrain livestock development. In areas where the population is mostly small and the land is poor, the supply of grain and feed is solved by increasing the multiple cropping, raising yield and increasing the planting area of sweet potato and wheat. Not competing with food, the high commodity rate of tea, fruit trees, hot work, marine fishery production has been formed with the local ecological conditions more concentrated distribution. In areas far from the city, the protection, reconstruction and utilization of mountain, grassland and beach resources are still not sufficient. The article also discusses the role of the concept of urban action gradient in the layout of agriculture and development of production.