Nitrogen addition has divergent effects on phosphorus fractions in four types of soils  

作　　者：Ping Zeng Qiong Zhao Jia‑yu Hu Xiang Zhang Bing Mao Qing‑ye Sun Wen‑ge Wu 

机构地区：[1]School of Resources and Environmental Engineering,Anhui University,Hefei 230601,Anhui,China [2]Key Laboratory of Environment Change and Resources Use in Beibu Gulf of the Ministry of Education,Nanning Normal University,Nanning 530001,Guangxi,China [3]School of Resources and Envi‑ronment,Anhui Agricultural University,Hefei 230031,Anhui,China [4]Rice Research Institute,Anhui Academy of Agricultural Sciences,Hefei 230031,Anhui,China

出　　处：《Ecological Processes》2024年第3期23-38,共16页生态过程(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant number 41877341);sub-project of the National Key Research and Development Program of China(Grant number 2022YFD2301403-4).

摘　　要：Background Globally increasing atmospheric nitrogen(N) deposition has altered soil phosphorus(P) transforma-tions and availability, and thereby influenced structure and function of terrestrial ecosystems. Edaphic characteristics and chemical form of deposited N could be important factors determining impacts of N deposition on soil P transfor-mations, yet the underlying mechanisms remain largely unknown. Objectives of this study were to examine how min-eral-N and amino N differently affect P fractions, and identify key soil properties determining N addition impacts on soil P transformations. Considering that amino N is an important component of deposited N and forest soils vary greatly in different regions, the results of present study can guide the management of forests across different soils under ongoing N deposition scenarios.Methods We conducted a 60-day laboratory experiment to investigate the effects of N addition(NH4NO3and gly-cine) on soil P fractions and related biochemical properties in four representative forest soils(brown, yellow brown, aeolian sandy, and red soils) in China. Glycine and NH4NO3were separately added at three rates(5, 10 and 20 g N m–2yr–1).Results Firstly, the percent changes in organic P fractions with N addition were significantly greater than changes in inorganic P fractions across all soils. Secondly, the percent changes in P fractions with glycine and NH4NO3addi-tions were significantly correlated across all soils and treatments. However, glycine addition had significantly greater impacts on organic P fractions than NH4NO3addition in the aeolian sandy and red soils with low organic carbon content. Thirdly, P fractions responded differently to N addition among the four soils. N-induced changes in microbial biomass and phosphatase activities, p H, exchangeable Ca2+and Mg2+contributed differently to the changes in P frac-tions with N addition in the four soils.Conclusions The different responses of P fractions to N addition in the four soils were mainly generated by the dif-fere

关 键 词：Acid bufering capacity Glycine addition Microbial activities Phosphorus fraction Soil type 

分 类 号：S153.6[农业科学—土壤学] X144[农业科学—农业基础科学]