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Changes of plant community composition instead of soil nutrient status drive the legacy effects of historical nitrogen deposition on plant community N:P stoichiometry
Plant and Soil ( IF 4.9 ) Pub Date : 2020-07-09 , DOI: 10.1007/s11104-020-04631-z Yan-Yu Hu , Hai-Wei Wei , Zhi-Wei Zhang , Shuang-Li Hou , Jun-Jie Yang , Jun-Feng Wang , Xiao-Tao Lü
Plant and Soil ( IF 4.9 ) Pub Date : 2020-07-09 , DOI: 10.1007/s11104-020-04631-z Yan-Yu Hu , Hai-Wei Wei , Zhi-Wei Zhang , Shuang-Li Hou , Jun-Jie Yang , Jun-Feng Wang , Xiao-Tao Lü
Uncovering the importance of soil and plant characteristics in driving the legacy effects of nitrogen (N) deposition on plant community nutrient stoichiometry would improve our understanding of plant-soil interaction during restoration of historically N-enriched ecosystems. Based on a field experiment with the cessation of six-year N addition in a temperate steppe of northern China, we measured concentrations and stoichiometry of N and phosphorus (P) in soils and different plant functional groups, under both mown and unmown conditions. Historical N addition did not affect soil total and available N and P concentrations and stoichiometry, but significantly altered plant community composition. Plant nutrient concentrations and N:P ratios significantly differed among four plant functional groups. The concentrations and stoichiometric ratios of N and P between soils and plants were generally not correlated. The positive legacy effects of N addition on community N:P stoichiometry were caused by the biomass enhancement of tall bunchgrass, the functional group with the highest N:P ratios. Changes in plant community composition instead of soil nutrient status were the main driver for the positive legacy effects of N enrichment on plant community stoichiometry. Given that the recovery of community composition after the cessation of N deposition is generally slow, our findings indicate that the legacy effects of N deposition on soil nutrient cycling would persist in long-term due to the importance of plant-mediated pathway.
更新日期：2020-07-09
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