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Effect of shrub encroachment on leaf nutrient resorption in temperate wetlands in the Sanjiang Plain of Northeast China

引用

Ecological Processes 2022年第1期11卷 968-975页

作者： Le‑Lin Yu Xin‑Hou Zhang Fu‑Xi Shi Rong Mao Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of ForestryJiangxi Agricultural UniversityNo.1101 Zhimin RoadNanchang 330045China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China School of Environment Nanjing Normal UniversityNanjing 210046China

Background:Nutrient resorption is an important plant nutrient conservation strategy in ***,how shrub encroachment alters plant nutrient resorption processes is unclear in temperate ***,we collected green and senesced leaves of common sedge,grass,and shrub species in wetlands with high(50–65%)and low(20–35%)shrub covers in the Sanjiang Plain of Northeast China,and assessed the impact of shrub encroachment on leaf nitrogen(N)and phosphorus(P)resorption efficiency and proficiency at both plant growth form and community ***:The effects of shrub cover on leaf nutrient resorption efficiency and proficiency were identical among shrubs,grasses,and *** of plant growth forms,increased shrub cover reduced leaf N resorption efficiency and proficiency,but did not alter leaf P resorption efficiency and ***,the effect of shrub cover on leaf nutrient resorption efficiency and proficiency differed between plant growth form and community *** the community level,leaf N and P resorption efficiency decreased with increasing shrub cover because of increased dominance of shrubs with lower leaf nutrient resorption efficiency over grasses and ***,community‑level senesced leaf N and P concentrations increased with elevating shrub cover,showing a decline in leaf N and P resorption ***,the significant relationships between leaf nutrient resorption efficiency and proficiency indicate that shrub encroachment increased senesced leaf nutrient concentrations by decreasing nutrient resorption ***:These observations suggest that shrub encroachment reduces community‑level leaf nutrient resorp‑tion efficiency and proficiency and highlight that the effect of altered plant composition on leaf nutrient resorption should be assessed at the community level in temperate wetlands.

关键词： Biodiversity Freshwater marsh Nutrient conservation strategy plant growth form Species composition

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