桤木人工林根系—土壤复合系统养分含量的变化规律

Change of Nutrient Content in Alnus cremastogyne Plantation Root System and Soil

对桤木人工林根系—土壤复合系统中大量元素、微量元素、土壤有机质含量和pH值等的季节动态变化进行了研究,结果表明:在桤木根系中大量元素N、Ca、K、Mg、P含量冬季最高,春季最低,微量元素Fe、Mn、Zn、Cu、Pb、Ni、Cd含量冬季最低,春夏季较高;土壤中大量元素N、Ca、K、Mg、P含量冬季最低、夏季最高,微量元素Mn、Zn含量在冬季最低、秋季最高,Fe、Ni、Pb、Cu、Cd含量在冬季最高、春秋较低;土壤有机质含量、pH值的季节动态变化与根系大量元素变化趋势保持一致;土壤各层有机质含量大小顺序为0～15 cm层、>15～30 cm层、>30 cm层,pH值大小顺序为>15～30 cm层、0～15 cm层、>30 cm层。

Study was carried out on seasonal change of macro-element, micronutrient levels soil, organic matter and pH value in Alnus cremastogyne plantation root system and soil. The results showed that in root system, it had the highest content of N, Ca, K, Mg and P in winter and the lowest in spring, and the lowest ofFe, Mn, Zn, Cu, Pb, Ni and Cd in winter and higher in spring and summer. While in the soil, it had the lowest content of N, Ca, K, Mg and P in winter and the highest in summer, but the lowest content of Mn and Zn in winter and the highest in autumn, whereas that of the other micro elements, the highest in winter and lower in spring and autumn. Organic matter and pH in the soil had the similar change with macro elements in root system. The reduced order of organic matter content in the soil layers was as follows： 0 - 15 cm and 〉15 - 30 cm 〉30 cm, and that of the pH value was 〉15 - 30 cm, 0 - 15 cm 〉30 cm.