玉米冠层的数学描述与三维重建研究

采用Lang提出的原理开发了空间坐标仪。利用该仪器测定玉米冠层的空间坐标,以此提出了应用一般二次方程描述玉米叶曲线和叶形的数学方法,方程的系数由最小二乘回归方法得到,其中叶曲线系数由叶片主脉坐标决定,叶形系数由沿叶长方向叶宽测定值决定。从而使应用较少参数描述真实的玉米群体结构成为可能。另外,还实现了玉米冠层的计算机三维重建,为农业生态系统研究提供了新的手段。

On Transregional Enrichment of Farmland Soil Nutrients.

Traditional patterns of farmland soil nutrients enrichment are mainly inner-system enrichment and regional enrichment. Along with the rapid commercialization of agricultural products, large amount of grain together with large amount of nutrients contained then flow from commodity grain producing region to food processing and exporting region, from inland to coastal region, from developed region to developing region. Thus, a new pattern of farmland soil nutrient enrichment, namely transregion enrichment is formed. This trend certainly will further enlarge the gap of economic development as well as soil fertility between these two regions. The way to deal with this new situation was approached from the standpoint of ecological economy.