Characteristics of nutrition elements in Poacynum hendersonii from different populations in Xinjiang

The contents of ten nutrition elements (N、P、K、Na、Ca、Mg、Cu、Fe、Zn and Mn) in Poacynum hendersonii from five different populations, collected in Apocynum reserve of Tushan region in Altay city Xinjiang province, were studied. The results indicated that. Cyan Stem with Middle Flower Poacynum (CMP) belonged to NCa type. Quite Fine Leaf with Middle Flower Poacynum(QFMP) and Red Stem with Middle Flower Poacynum(RMP) belonged to NK type, whereas Middle Fine Leaf with Middle Flower Poacynum (MFMP) and White and Middle Flower Poacynum (WMP) belonged to KCa and KN type respectively. N in QFMP was significantly higher than other populations. K in MFMP and WMP populations was significantly higher than others. The contents of four trace elements in these five populations had the same order: FeMnZnCu, except RMP with highest content of Mn. For individual trace element compared among these populations, Mn was significantly different between populations. No significant difference was found on Fe and Zn. Cu in CMP, RMP and QFMP was significantly higher than that in MFMP, while no significant difference was found in Cu content between WMP and any other populations. By correlation analysis, it showed that Mg and Mn，K and P，Ca and Mg，Fe and Zn had a significant positive correlation（P＜0.05).Na and Ca, Cu, Mn and K, Cu, N and P had a significant negative correlation.