摘要
耕地生产力指数是指在研究地域范围内某一作物在某一地区的平均单产和整个地域平均单产的比值。此值削弱或抵销了一些影响单产的其它因素,能体现某一地区的耕地质量或土壤肥力水平与种植优势,为农业生态系统功能评价和土壤肥力研究提供了一个有力的手段。扬州市里下河地区兴化县的高指数较多,邗江县的低指数较多,主要和两地土壤形成特点与肥水输入势有关。
The farmland productivity index is the ratio of a crop average per-mu yield in a part of the research area and the crop's average per-mu yield in the whole area, which can weaken and counterbalance the other factors that influence the per-mu yield and shows fully the farmland quality, the soil fertility level and the planting superiority. This index provides a powerful method for the agri-eeological system functions' evaluation and thesoil fertility research. The majority of the values of index in the Xinghua county of Lixiahe area are high, however in the Hanjiang county area, the majority are low. This is due to differences of soil forming specialities and inputs of fertilizers and irrigation between these two areas. The research of the relationship between the farmland productivity index and soil fertility has a great significance in uniting the concepts of yield and fertility which were separated in the traditional soil science.
出处
《江苏农学院学报》
CSCD
1989年第1期13-16,共4页
Jiangsu Agricultural Research
关键词
耕地
生产力指数
土壤肥力
farmland productivity index
soil fertility
high and stable yield farmland
dissipative structure
