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[1]REN Lihong,SUO Peiheng,TANG Chujun,et al.Seasonal Dynamics of Soil Nitrogen in the Continuously Cultivated Chinese Fir Plantations[J].Research of Soil and Water Conservation,2021,28(05):22-28.

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Seasonal Dynamics of Soil Nitrogen in the Continuously Cultivated Chinese Fir Plantations

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 22-28 Column: Public date: 2021-08-20

Title:: Seasonal Dynamics of Soil Nitrogen in the Continuously Cultivated Chinese Fir Plantations

Author(s):: REN Lihong¹,SUO Peiheng¹,TANG Chujun¹,LIU Yuhui²,CHEN Huiⁱ²,WANG Yuzhe¹,LIU Xian¹; (1.Forestry College,Fujian Agriculture and Forestry University,Fuzhou 350002,China; 2.Xinkou Forest Station,Fujian Agriculture and Forestry University,Sanming,Fujian 365002,China)

Keywords:: Chinese fir plantation; consecutive rotation; soil nitrogen; seasonal variation

CLC:: S714.7

DOI:: -

Abstract:: This study aims to investigate the seasonal dynamics of the contents of different fractions of soil nitrogen(total nitrogen,TN; dissolved organic nitrogen,DON; ammonium nitrogen,NH⁺₄-N; nitrate nitrogen,NO^-₃-N; microbial biomass nitrogen,MBN)in different successive rotations(first-rotation plantation,FRP; second-rotation plantation,SRP; third-rotation plantation,TRP)of subtropical Chinese fir(Cunninghamia lanceolate)plantation and Castanopsis Kawakamii dominated natural forest(NF)from December 2017 to September 2018 in Sanming,Fujian,China. The results showed that:(1)the contents of soil TN and DON exhibited significant seasonal variations in Chinese fir plantation; TN content decreased in the order: June>December>March>September,DON content decreased in the order: June>September>March>December;(2)the contents of soil NH⁺₄-N in soils increased with the increment of successive rotations of Chinese fir,while the contents of NO^-₃-N presented the opposite trend; the contents of soil NH⁺₄-N and NO^-₃-N exhibited significant seasonal variations in Chinese fir plantations,and the soil NH⁺₄-N content reached the maximum in March,while the soil NO^-₃-N content reached the maximum in June;(3)the soil MBN content was significantly affected by different generations of Chinese fir plantation,sampling seasons and their interactions;(4)there was significant correlation among soil TN,NH⁺₄-N and NO^-₃-N contents in Chinese fir plantations,and there was also significant correlation among soil MBN,DON and NH⁺₄-N(p< 0.01),and there was significant relationship among soil moisture,MBN,DON and NH⁺₄-N,indicating that soil moisture was the key factor regulating the seasonal dynamics of soil N in Chinese fir plantations. Successive rotation had no significant impact on contents of soil TN and DON,but led to the reduction in the nitrate content and enhancement of ammonium content. These results indicate the N-conservation strategy of successive rotations in Chinese fir plantation,and the underlying microbial mechanism on the dynamics of soil nitrogen needs to be further studied.

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Last Update: 2021-08-20