摘要
对油松针叶中营养元素含量季节变化的研究表明,各龄针叶中N、P、K含量在6月初较高,在生长季节中逐渐降低;Ca含量为持续增加;Mg含量在一龄叶中呈递增趋势,在二、三龄叶中基本保持稳定。并提出了分析油松针叶营养元素含量的最佳采样时期及最小采样株数。
Describes the seasonal variation of nutrient elements content of Chinese pine (Pinus tabulae formis) needles. nitrogen, phosphorus and potassium contents among different age needles were higher in early June and decreased gradually with growing season, whereas calcium content increased steadily. Magnsium content in one-year-old needles tended to increase and remained stable in 2 or 3 years old needles. The optimum sampling period and minimum sampling number of needles for analysis of the nutrient elements contents were also given.
出处
《西北林学院学报》
CSCD
1991年第4期10-15,共6页
Journal of Northwest Forestry University
关键词
油松
针叶
营养元素
含量
季节
Pinus tabuleaformis
needles
nutrient element
content
season
variation
