旱坡地枣树密植园密度与根系关系的研究

枣树的地上部分与根系的关系的相互依存，彼此制约的辩证统一关系，密度与根系关系就是从密度影响二者的矛盾中体现的，枣权索性密植园，栽植密度显著地影响着根系的生长发育，幼树期，密度从栽植后第２年或第３年起便开始制约枣树的生长发育，首先表现在根系对土壤有限养分水分的竞争上，到８年生时，不同密度植株根系在坡面上和水平沟内的分布数量和大小是不相同的，根的分布趋势是，粗大根随着密度的增加逐渐减少。

Study of the Relation Between Planting Density and Root on Jujube Close Planting Garden in Arid Hillside Fields

root and top in the jujube plant are interdependent and interactive,comprising a dialectical unit relation ship.The relation between planting density and root was incarnated in the process of affecting contradiction of the two sides by density.in close planting garden,planting density remarkably affects the root growth and development.at young stand stage,density begins to control plant growth and deve lopment from the second or the third year after planting,first,displaying the root system's competiting for limited nutrient and water in soil.at the age of eight,the number and the thickness of each plant root distributed in slope field and in level ditch differ with one another,the trend of root distribution is that big root declines with the increase of planting density.