草珊瑚不同部位碳氮磷化学计量特征研究

探讨草珊瑚不同器官中C、N、P含量变化及化学计量特征,为草珊瑚的丰产和氮磷肥科学施用提供理论指导。以野生抚育草珊瑚为研究对象,测定不同生长时期下草珊瑚茎和叶中C、N、P含量,分析不同生长时期草珊瑚茎、叶中C、N、P含量变化特征及化学计量特征,判定草珊瑚生长的限制性营养元素。叶中碳、氮、磷含量分别为531.45~614.66、16.81~18.51、0.41~0.84 g/kg,变异系数分别为5.13%、3.60%、21.29%;茎中则为547.11~610.11、5.88~6.91、0.33~0.50 g/kg,变异系数为3.77%、5.21%、13.67%。叶中C/N、C/P、N/P分别为29.33~34.02、661.40~1311.30、20.34~44.71,茎中则为84.96~100.23、1189.74~1695.71、14.03~18.48。叶中N与P呈负相关,P与C/P、N/P均呈极显著负相关,C/P与N/P呈极显著正相关;茎中N与P呈正相关,P与N/P呈显著负相关,P与C/P呈极显著负相关,C/P与N/P呈显著正相关。草珊瑚的生长主要受N和P含量的限制,更大程度受P含量限制。因此,在林下种植草珊瑚时,考虑林地的养分供给能力,施用氮磷混合肥有利于草珊瑚对养分的吸收利用,达到提高产量和品质的目的。

Study on the Stoichiometric Characteristics of Carbon,Nitrogen and Phosphorus in Different Parts of Sarcandra glabra

The paper aims to explore the content changes and stoichiometric characteristics of carbon, nitrogen and phosphorus in different organs of Sarcandra glabra, and to provide theoretical guidance for high-yield cultivation of S. glabra and scientific application of nitrogen and phosphorus fertilizer. Taking wild tending S. glabra as the research object, the contents of C, N and P in the stems and leaves of S. glabra at different growth periods were determined, and the content variation characteristics and stoichiometric characteristics of C, N and P were analyzed to determine the limiting nutrients of S. glabra. The content of carbon, nitrogen, and phosphorus in the leaves was 531.45-614.66, 16.81-18.51 and 0.41-0.84 g/kg, respectively, and the coefficient of variation was 5.13%, 3.60% and 21.29%, respectively; the content of carbon, nitrogen, and phosphorus in the stems was 547.11-610.11, 5.88-6.91 and 0.33-0.50 g/kg, respectively, and the coefficient of variation was 3.77%, 5.21% and 13.67%, respectively. C/N, C/P and N/P in leaves were 29.33-34.02, 661.40-1311.30, and 20.34-44.71, respectively, and those in stems were 84.96-100.23, 1189.74-1695.71, and 14.03-18.48, respectively. There was a negative correlation between N and P in leaves; a very significantly negative correlation between P and C/P, as well as between P and N/P; and an extremely and significantly positive correlation between C/P and N/P. There was a positive correlation between N and P in stems; a significantly negative correlation between P and N/P; a very significantly negative correlation between P and C/P; and a significantly positive correlation between C/P and N/P. In summary, the growth of S. glabra is mainly restricted by the content of N and P, and to a great extent by the content of P. Therefore, when planting S. glabra under forests, the nutrient supply capacity of the forest land should be considered, and the application of nitrogen and phosphorus mixed fertilizers is conducive to the absorption and utilization of nutrients by S. glabra to achieve the purpose of improving yield and quality.