Internal Stability Characteristics of Nitrogen,Phosphorus and Potassium in the Leaves of Different Acacia Plantations
In July 2018,taking plantations of Acacia crassicarpa A.Cunn.ex Benth.,A.melanoxylon R.Br.,A.cincinnata F.Muell.,A.auriculiformis A.Cunn.ex Benth.,and A.mangium Willd.as research objects in Zhangzhou City of Fujian Province,the homeosta-sis characteristics of N,P,K and C∶N,C∶P,C∶K and N∶P of their mature leaves were studied,in order to reveal the ecological adap-tation strategies of different Acacia species.The results show that:there were differences in the internal stability index of leaf elements of different Acacia species,except for the N homeostasis index of A.melanoxylon R.Br.,the HN of the other four Acacia species be-longed to the sensitive type,and the P and K homeostasis indices of the five Acacia species were sensitive.The stoichiometric ratio of elements was significantly higher than the elemental content,and the C∶N stability indices of Acacia species were all steady-state,The HC∶P,HC∶K,and HN∶P of Acacia species generally showed weakly stable or steady state types(except for HC∶P of A.auriculiformis A.Cunn.ex Benth.,HC∶K of A.cincinnata F.Muell.and HN∶P of A.mangium Willd.).In conclusion,Acacia crassicarpa A.Cunn.ex Benth.had higher HC∶P and HC∶K,A.melanoxylon R.Br.had higher HN and HN∶P,and A.cincinnata F.Muell.had higher HP and HC∶N,indicating that different Acacia species had different adaptability to the external environment,and Acacia species with higher homeo-stasis had stronger adaptability to the corresponding soil nutrient variation.
万方数据
维普
