不同土层中氮磷钾养分对红松针叶磷素的影响

本文以红松1~2年生叶片和其林下生长的土壤为对象,研究红松叶片中磷含量、磷贮量及其林下土壤中0~20、20~40和40~60 cm土层的氮磷钾矿质养分含量。揭示叶片质量、磷素水平与各层土壤速效氮、速效钾和速效磷的相互关系。结果表明：叶片质量与土壤中速效养分含量无关,土壤中速效氮含量与针叶磷含量无关,0~20 cm土层的速效钾含量与2年生针叶磷含量显著相关。不同年生针叶的磷含量与各土层的速效磷含量都有显著的回归关系。针叶中磷贮量与土壤中速效养分无明显相关性。

Effects of Nitrogen Phosphorus and Potassium in Different Soil Layer on Phosphorus of Pinus koraiensis Needles

The 1 to 2- year- old Pinus koraiensis leaves and each layer of soils were used to study the correlations between phosphorus contents and phosphorus storages in leaves of Pinus koraiensis and mineral nutrient contents（ N,P,K） in 0- 20,20- 40, and 40- 60cm soil in northeast regions. Result showed that leaves weight was not correlated to the available nutrient of soil. The phosphorus content was also not related to the available N contents,but the phosphorus content of the 2-year-old needles was significantly related to available K contents in 0- 20 cm layer. In addition,significant correlations were found in phosphorus in the leaves of different leaf ages and available P contents of each layer. Finally,phosphorus storages in leaves had no significant correlation with the available nutrient in the soil.