不同海拔多花黄精各器官碳氮磷化学计量特征

Stoichiometric Analysis of C,N and P in Polygonatum multiflorum at Different Altitudes

于2018年9月,在浙江省松阳县玉岩镇多花黄精种植地,采用样方法分别在海拔200、500、800、1100 m处随机挖取多花黄精标准株,测定多花黄精叶、茎、果、根、块茎的C、N、P含量,计算化学计量特征,并分析其相关性。结果表明:不同海拔下多花黄精各器官C、N、P含量及其化学计量比差异显著,且变化规律不一致。茎的C含量显著高于其它器官,叶的N含量显著高于其它器官,根的P含量显著高于其它器官。随着海拔升高,块茎中的C、N、P含量总体呈降低趋势,在海拔200 m处含量最高;各器官的C∶N总体呈升高趋势,而N∶P呈先下降后升高再降低的趋势。相关性分析表明,多花黄精具有复杂的内在协调机制。综上,在海拔200 m处种植多花黄精将得到更高的品质与产量;多花黄精各器官的C、N含量较高,而P较缺乏,多花黄精生长主要受P限制。因此,在低海拔地区施肥应考虑N、P均衡,高海拔地区施肥则需增施磷肥。

In September 2018,the standard plants of Polygonatum multiflorum were randomly sampled at the altitudes of 200 m, 500 m, 800 m and 1100 m by sampling method in Yuyan Town, Songyang County, Zhejiang Province.Contents of C,N,and P in leaves, stems, fruits, roots, and stem tubers of Polygonatum multiflorum were measured.The stoichiometric characteristics were calculated, and the correlation was analyzed.The results showed that the contents of C,N,and P and their stoichiometric ratios in different organs of Polygonatum multiflorum at different altitudes were significantly different, and the variation rules were inconsistent.The content of C in stem was significantly higher than that in other organs, and the content of N in leaf was significantly higher than that in other organs.However, the content of P in root was significantly higher than that in other organs.The contents of C,N,and P in stem tubers decreased with the increase of altitude, and the highest were at the altitudes of 200 m.With the increase of altitude, the C∶N of each organ generally increased, while the N∶P decreased first, then increased and then decreased.Correlation analysis showed that Polygonatum multiflorum had complex internal coordination mechanism.In conclusion, the quality and yield were the highest at the altitude of 200 m.The contents of C and N in various organs of Polygonatum multiflorum were higher, while the content of P was lacking.The growth of Polygonatum multiflorum was mainly limited by the content of P.Therefore, the balance of N and P should be considered in low altitude fertilization, and P fertilizer should be added in high altitude fertilization.