不同林龄序列杉木人工林土壤氮有效性及氮矿化特征分析  

Characteristic Analysis on Soil Nitrogen Availability and Nitrogen Mineralization of Chinese Fir Plantation with Different Age Sequences

作　　者：王梦娟 张冰冰 邹秉章 王思荣 万晓华[1,2] WANG Meng-juan;ZHANG Bing-bing;ZOU Bing-zhang;WANG Si-rong;WAN Xiao-hua(School of Geographical Science, Fuzhou Normal University, Fuzhou, Fujian 350007, China;Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou, Fujian 350007, China;Fujian Shanghang Baisha State-owned Forest Farm, Longyan, Fujian 364205, China)

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]湿润亚热带山地生态国家重点实验室培育基地,福建福州350007 [3]福建省上杭白砂国有林场,福建龙岩364205

出　　处：《福建农业科技》2022年第1期66-71,共6页Fujian Agricultural Science and Technology

基　　金：中国博士后科学基金第13批特别资助(站中)(2020T130100)。

摘　　要：以亚热带不同林龄(5、8、21、27、40年生)杉木人工林为研究对象,探索不同林龄杉木林土壤氮矿化速率、微生物生物量氮、有效氮含量的差异及关键影响因子。结果表明:土壤矿质氮含量随林龄的增加而降低,27年生的微生物生物量氮和矿质氮显著高于21年生。土壤净氮矿化速率随林龄呈波动变化,其中40年生显著高于8年和27年。土壤净氮矿化速率与硝态氮含量呈正相关,与总氮和总磷含量呈显著负相关。结果显示在营林阶段施用磷肥以及采取间伐措施,在很大程度上能够减少土壤氮损失。By taking Chinese fir plantations with different forest ages(5,8,21,27,40 years old)in subtropical region as the research object,the differences of soil nitrogen mineralization rate,the contents of microbial biomass nitrogen and available nitrogen in Chinese fir plantations with different forest ages and the key influencing factors were explored.The results showed that the content of soil mineral nitrogen decreased with the increase of forest age,and the contents of microbial biomass nitrogen and mineral nitrogen in the 27-year-old Chinese fir plantation were significantly higher than those in the 21-year-old Chinese fir plantation.The soil net nitrogen mineralization rate fluctuated with the forest age,among which the soil net nitrogen mineralization rate in the 40-year-old Chinese fir plantation was significantly higher than those in the 8-year-old and 27-year-old Chinese fir plantation.The soil net nitrogen mineralization rate was positively correlated with the nitrate nitrogen content,and had significant negative correlation with the contents of total nitrogen and total phosphorus.The results showed that the application of phosphorus fertilizer in the forest culture and management stage and the adoption of thinning measures could reduce the soil nitrogen loss to a large extent.

关 键 词：人工林 年龄序列 氮矿化速率 土壤理化性质 

分 类 号：S714.2[农业科学—林学]