关键词: 营养元素, 叶片, 古树, 健康状况

Abstract: [Objective] The objective of this study was to apply data support for protection and preserve of ancient trees,through learning about the nutrient elements characteristic of these ancient trees and the relationship between then and the healthy condition.[Method] Various ancient tree species in Beijing,including different species,different sites,were chose to analyze the elements characteristic.The relationship between elements and healthy conditions which computed by ancient trees assessment system version 1.0.[Results] TN and TP were highest among all the measured indicators.The relationship between them was positive correlation.The relationship between Ca and Zn,TP was significant negative correlation,Ca and Mg was remarkable,Zn and TP,Mg was positive correlation.Elements from the different species in the same location were non-significant variation except Zn,Mg and TK.Elements from the same tree and different sites were also non-significant except few elements.The ancient tree health condition were position correlation with Ca,Mg,Zn,Fe and TK.[Conclusion] After long-time absorbing and accumulate,nutrient elements existed as combined form in ancient trees were non-significant,while those as free state were significant.Environmental stress restrained the ancient trees grow well.Therefore,proper measures should be adopted in the right conditions.

Key words: nutrient elements, leaves, ancient trees, healthy degree