土壤学报2025，Vol.62Issue(1)：233-245,13.DOI:10.11766/trxb202309110372
林冠氮沉降对毛竹林土壤磷组分的影响
Effect of Canopy Nitrogen Deposition on Soil Phosphorus Fractions in a Moso Bamboo Forest
摘要
Abstract
[Objective]Nitrogen(N)deposition is an important global climate change factor affecting soil phosphorus(P)cycling in forest ecosystems.However,understory N application typically applied directly to the ground,has been widely used to simulate N deposition in forest ecosystems in the past.This simulation method may neglect the retention and adsorption effect of the forest canopy,which cannot truly assess the effect of N deposition on soil P cycling.Moreover,organic N is another important component of atmospheric N deposition,but the ecological effect of the organic N deposition has not been fully studied.[Method]To evaluate the effect of atmospheric N deposition on soil P cycling,a field experiment was conducted involving six treatments:canopy control(CNA-CK),canopy inorganic N addition(CNA-IN),canopy organic N addition(CNA-ON),understory control(UNA-CK),understory inorganic N addition(UNA-IN),and understory organic N addition(UNA-ON)based on the Anji Moso Bamboo Ecosystem Research Station of Zhejiang A&F University,in Anji County,Zhejiang Province.The N deposition rate was set at 50 kg·hm-2·a-1(based on the atomic mass of N,the same as below).IN uses ammonium nitrate while ON uses a mixture of 25 kg·hm-2·a-1 urea and 25 kg·hm-2·a-1 glycine as the N source.The CK treatment involves adding an equal amount of water.Soil P fractions,microbial biomass P,acid phosphatase activity,P cycling functional gene abundance,and some physicochemical properties were measured to investigate the effects of different N deposition simulation approaches and N components on soil P fractions and their driving factors.[Result]The results showed that canopy N addition(CNA)significantly reduced soil total P,occluded P,and labile P concentrations compared to understory N addition(UNA)with the percentage of 15.1％-26.5％,18.3％-21.5％and 9.7％-38.3％,respectively.However,soil P fractions did not differ significantly between CNA-ON and CNA-IN treatments,whereas UNA-IN treatment significantly reduced resin P and labile P content compared to UNA-ON treatment.Acid phosphatase activity and pH were the main factors affecting soil P fractions,but N deposition did not significantly influence soil P cycling functional gene abundance.[Conclusion]Therefore,it was suggested that simulating N deposition via CNA significantly reduced the contents of total P and P fractions such as occluded P and labile P of Moso bamboo forest soils,whereas simulating N deposition via conventional UNA underestimated this reduction effect.Soil P is closely linked to the cycling of soil carbon and N,which are vital for maintaining a balanced nutrient ecosystem.Consequently,future simulation experiments on N deposition should systematically consider the effects of N deposition simulation approaches and N addition components on soil carbon,N,and P cycling processes.关键词
土壤磷组分/林冠氮沉降/林下氮沉降/有机氮/酸性磷酸酶活性Key words
Soil phosphorus fraction/Canopy nitrogen deposition/Understory nitrogen deposition/Organic nitrogen/Acid phosphatase activity分类
林学引用本文复制引用
魏经纬,肖向前,卓寿佳,蒋文婷,孙宏洋,陈有超,李永夫,余兵,蔡延江..林冠氮沉降对毛竹林土壤磷组分的影响[J].土壤学报,2025,62(1):233-245,13.基金项目
国家重点研发计划政府间国际科技创新合作重点专项项目(2022YFE0127800)、国家自然科学基金项目(42277286)和浙江省科学技术厅领雁计划项目(2023C02035)资助 Supported by the Key Project for Government-to-Government International Scientific and Technological Innovation Cooperation under the National Key Research and Development Program of China(No.2022YFE0127800),the National Natural Science Foundation of China(No.42277286)and the Leading Goose Project of Science Technology Department of Zhejiang Province,China(No.2023C02035) （2022YFE0127800）
