【摘要】 作者于1987～1989年对沙棘、柠条和山桃林地土壤及枝叶中主要营养元素的含量及其年周期变化进行了研究。结果表明:一年之中,土壤中K素的含量对树木的生长不产生限制性影响,且变幅不大,而N、P两素含量偏低,并随树木的生长而减少;树木枝叶中N、P、K三素的含量随树木的生长而增加;土壤与枝叶间N、P两素含量变化的负相关性势必对树木生长产生限制性影响。更多还原

【Abstract】 The main nutrient content in leaves, branches and soil and their annual periodic changes of Seabuckthorn (Hippophae rhamnoides), Korshinsk peashrub (Caragana korshinskii), David peach (Prunus davidiana) were carried out during 1987-1989. The results showed that the yearly K content in soil varied inapparently and did not limit the tree growth. The yearly content of N and P in soil was lower and was decreasing along with the tree growth. The content of N,P,K in leaves, branches was increasing along with the tree growth.The negative correlation in amount of N and P among leaves, branches and soil would limit the tree growth.更多还原