水稻边际优势利用栽培增产的生态原因研究

对大小垄栽培群体和30cm等行距栽培群体不同层次的光照强度、群体行间温、湿度等生态因子及每穴穗数、每穗实粒数和单穴生产力三个产量性状和不同分蘖时期每穴茎数的边际效应指数进行了研究。结果表明,大小垄栽培群体下部的光照强度和透光率显著增加,行间温、湿度降低,使群体内部的光、温条件得到改善。每穴穗数、每穗实粒数和单穴生产力及不同分蘖时期每穴茎数的边际效应指数降低,说明实行大小垄种植后,群体内部的长势与边行的差距缩小,群体内部个体的生长优势得到发挥,达到了利用边际优势增产的目的。

Studies on Ecological Cause for Increasing Production of Utilzing Advantage of Boundary Row in Rice

Changes of some index about two different planting patterns (wide-narrow ridge and equal ridge) of paddy were studied, which include illumination intensity of different layers, temperature and humidity between rows,number of tassel per cave, number of seeds per tassel, index of boundary effect about the number of stems per cave in different period of tiller. The results showed that when planted in wide-narrow ridge,the illumination intensity and rate of pervious to light are remarkably increased,while temperature and humidity between rows decreased,and the condition of light and temperature in the colony are greatly improved. Some index are decreased such as the index of boundary effect about temperature and humidity of colony in row,the number of tassel per cave, the number of seeds per tassel and the number of stems per cave in different period of tiller. which demonstrate that after planting in wide-narrow ridge,the difference of growth in the colony and boundary row is reduced,while the growth advantage of individual in the colony is developed,so it arrives at the purpose of taking advantage of boundary row to increase production.