Leaf nutrient resorption characteristics of Robinia pseudoacacia at different ages and their response to soil nutrient availability

doi:10.13287/j.1001-9332.202010.001

Abstract

Abstract: To reveal nutrient resorption characteristics of Robinia pseudoacacia and their driving factors in hilly and gully regions, we measured the concentration of total nitrogen and total phosphorus in leaves and the concentrations and stoichiometry of organic carbon, total nitrogen, total phospho-rus, ammonium, nitrate and available phosphorus in soils of R. pseudoacacia plantations with different stand ages. We analyzed the relationship between leaf nitrogen and phosphorus resorption efficiencies and soil nutrient characteristics. The nutrients in plants and soil changed significantly with stand ages. The total and available phosphorus concentrations were low in the soil. Nitrogen resorption efficiency first increased and then decreased with the increases of stand age, with a range of 48.2%-54.0% and a mean value of 48.5%. Phosphorus resorption efficiency increased significantly with stand age, with a range of 45.2%-49.4% and a mean value of 46.9%. Nitrogen resorption efficiency showed negative response to soil nitrogen and N:P. Phosphorus resorption efficiency was significantly positively correlated to soil N:P and negatively correlated to soil available phosphorus. Our results indicated that soil nutrient availability negatively drove nutrient resorption efficiency. The strategies of leaf nutrient resorption responded strongly to soil N:P due to the N₂-fixing effect and P-limitation of R. pseudoacacia.

Key words: Robinia pseudoacacia, nutrient resorption, soil nutrient availability, stoichiometry, nutrient limitation

XU Miao-ping, ZHANG Xin-yi, LI Wen-jie, REN Cheng-jie, YANG Gai-he, HAN Xin-hui. Leaf nutrient resorption characteristics of Robinia pseudoacacia at different ages and their response to soil nutrient availability[J]. Chinese Journal of Applied Ecology, 2020, 31(10): 3357-3364.

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