不同恢复年限退化土壤有机氮组分变化特征

为明确退化土壤在不同恢复年限下土壤有机氮组分变化规律,以福建长汀县退化红壤为研究对象,利用时空替代法,选取5个典型的不同植被恢复阶段样地,分别为裸地,恢复7、17、23、35 a的马尾松(Pinus massoniana)人工林,采用Bremner酸水解法研究土壤有机氮各组分的变化特征.结果表明,与裸地相比,恢复年限为...

Characteristics of Soil Organic Nitrogen Component of Degraded Land with Different Vegetation Restoration Ages

In this study,the Bremner method was used to measure soil organic nitrogen(N)components and to clarify the characteristics of soil organic N components with five typical vegetation restoration stages(bare land,Pinus massoniana plantations restored for 7,17,23 and 35 ages)in Changting County,Fujian Province.The results showed that,compared with the bare land,soil total N content in the vegetation restoration stage for 7,17,23 and 35 ages increased by 2.57,3.71,4.00 and 5.57 times,respectively.The organic N existed mainly in the form of acid hydrolysable N.The acid hydrolysable N and non-acid hydrolysable N contents increased significantly with total N increasing.The contents of soil ammonium N,amino acid N,hydrolysable unidentified N increased with the recovery ages.There were significantly positive correlations among acid hydrolyzed N and ammonium N,amino acid N,hydrolysable unidentified N.The ammonium N,amino acid N,hydrolysable unidentified N and amino sugar N accounted for about 12.3%,47.2%,35.3%,5.1%of the increased acid hydrolysable N in soil,respectively.The changes of organic nitrogen composition characteristics affect the soil N supply and storage capacity.The results of this study can provide basic theory for nutrient management in the process of degraded soil restoration.