Ecological stoichiometric comparison of plant-litter-soil system in mixed-species and monoculture plantations of Robinia pseudoacacia,Amygdalus davidiana,and Armeniaca sibirica in the Loess Hilly Region of China  

作　　者：Senbao Lu Yunming Chen Jordi Sardans Josep Penuelas 

机构地区：[1]State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,712100,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]Institute of Soil and Water Conservation,Northwest A&F University,Yangling,712100,China [4]CSIC,Global Ecology Unit CREAF-CSIC-UAB,Bellaterra,08193,Catalonia,Spain [5]CREAF,Cerdanyola del Vall�es,08193,Catalonia,Spain

出　　处：《Forest Ecosystems》2023年第3期411-424,共14页森林生态系统（英文版）

基　　金：funded by the National Nature Science Foundation of China (No.41771556);funded by the Spanish Government Grants PID2020-115770RB-I00 and TED2021-132627B–I00;funded by the Spanish MCIN,AEI/10.13039/501100011033;the European Union NextGenerationEU/PRTR,the Catalan government grant SGR2021-1333;the Fundaci on Ram on Areces grant CIVP20A6621

摘　　要：We examined how afforestation patterns impact carbon(C),nitrogen(N),and phosphorus(P)stoichiometry in the plant-litter-soil system.Plant leaf,branch,stem,and root,litter,and soil samples were collected from mixedspecies plantations of Robinia pseudoacacia with Amygdalus davidiana(RPAD),R.pseudoacacia with Armeniaca sibirica(RPAS),and monocultures of R.pseudoacacia(RP),A.davidiana(AD),and A.sibirica(AS)in the Loess Hilly Region.The results showed that in mixed-species plantations,R.pseudoacacia had lower leaf N and P concentrations than in monocultures,while both A.davidiana and A.sibirica had higher leaf N and P concentrations.Soil P limited tree growth in both afforestation models.Mixing R.pseudoacacia with A.davidiana or A.sibirica reduced N-limitation during litter decomposition.Average soil total N and P concentrations were higher in RPAS than in RPAD,and both were higher than the corresponding monocultures.The average soil C:N ratio was the smallest in RPAS,while the average soil C:P ratio was larger in RPAS than in RP.A positive correlation between N and P concentrations,and between C:N and C:P ratios,was found in litter and all plant organs of mono-and mixedstands.Alternatively,for N concentration and C:N ratio,the correlations between plant(i.e.,leaf,branch,root)and litter and between plant and soil were inverse between plantation types.RPAD has an increased litter decomposition rate to release N and P,while RPAS has a faster rate of soil N mineralization.RPAD was the best plantation(mixed)to improve biogeochemical cycling,as soil nutrient restrictions,particularly for P-limitation,on trees growth were alleviated.This study thus provides insights into suitable tree selection and management by revealing C:N:P stoichiometry in the plant-litter-soil system under different afforestation patterns.

关 键 词：Stoichiometry PLANT LITTER Soil Tree mixture Loess Plateau 

分 类 号：S718.5[农业科学—林学]