丛枝菌根真菌和施加不同形态氮肥对杉木幼苗养分吸收的影响

为了解丛枝菌根真菌(AMF)和不同形态氮对杉木(Cunninghamia lanceolata)生长和养分吸收的影响，以1 a生杉木幼苗接种摩西球囊霉(Glomus mosseae)和添加不同形态氮(NH₄⁺-N和NO₃^–-N)，对其养分元素和生长状况的变化进行研究。结果表明，AMF显著提高了杉木的苗高和生物量，促进了杉木对N、P、K、Ca、Mg、Fe和Na的吸收，AMF对微量元素Fe、Na的促进作用总体上要强于大量元素K、Ca。与NO₃^–-N相比，AMF显著提高了NH₄⁺-N处理杉木的生物量、总C和N、Ca、Mg、Mn含量，而且这种显著性在叶中普遍高于根和茎。接种AMF可以促进杉木幼苗的生长和对养分元素的吸收，且添加NH₄⁺-N处理的促进作用要强于NO₃^–-N。

Effects of Arbuscular Mycorrhizal Fungi and Application of Different Nitrogen Fertilizers on Nutrient Absorption of Chinese Fir Seedlings

In order to understand the effects of arbuscular mycorrhizal fungi (AMF) and addition different forms of nitrogen on the growth and nutrient uptake of Chinese fir (Cunninghamia lanceolata), the seedlings at 1-year-old were inoculated AMF (Glomus mosseae, Gm) and treated with different forms of nitrogen (NH₄⁺-N and NO₃^--N), the changes in nutrient elements and growth status were studied. The results showed that AMF increased significantly the seedling height, biomass and the uptake of N, P, K, Ca, Mg, Fe and Na, and the promotion effect of AMF on trace elements of Fe and Na was generally stronger than that of macro elements of K and Ca. Compared with the addition of NO₃^--N, the positive effect of AMF on biomass, C, N, Ca, Mg and Mn contents were more significant with the NH₄⁺-N addition. Moreover, the increased magnitude was stronger in leaves than that in root and stem. Therefore, it was suggested that the inoculation of AMF promoted the growth and nutrient uptake of Chinese fir seedlings. Additionally, the positive effects of AMF on growth and nutrient uptake treated with NH₄⁺-N were more prominent than that with NO₃^--N.