模拟氮磷沉降和凋落物处理对红松林土壤全氮和有机氮的影响  

Effects of simulated nitrogen and phosphorus deposition and litter treatment on the soil total nitrogen and organic nitrogen in Pinus koraiensis forest

作　　者：王美娟 段文标[1] 陈立新[1] 曲美学 王亚飞 杨永超 潘磊 石金永 WANG Meijuan;DUAN Wenbiao;CHEN Lixin;QU Meixue;WANG Yafei;YANG Yongchao;PAN Lei;SHI Jinyong(School of Forestry,Northeast Forestry University,150040,Harbin,China)

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《中国水土保持科学》2022年第5期56-65,共10页Science of Soil and Water Conservation

基　　金：国家自然科学基金“阔叶红松林凋落物-氮磷沉降耦合输入对土壤团聚体碳氮激发效应及稳定性影响”(31770656);“阔叶红松混交林连根拔起倒木及其丘坑微立地特征对幼苗更新的影响”(31670627)。

摘　　要：为阐明模拟氮磷沉降和凋落物处理对红松人工林和阔叶红松林土壤全氮及水解性有机氮的影响,2018和2019年在黑龙江省伊春市带岭区凉水国家级自然保护区2种林型内,实施2种处理试验,其中前者以(NH_(4))_(2)SO_(4)和(NH_(4))_(2)HPO_(4)作为氮源和磷源进行模拟试验,设置4个水平,每个水平3个重复;后者凋落物处理设置3个水平,每个水平3个重复。采用方差分析法,揭示2种处理对土壤全氮和水解性有机氮的影响。结果表明:1)2种处理均对土壤全氮有显著影响,但对土壤水解性有机氮的影响因试验时间而异;2)土壤全氮与各种形态的水解性有机氮呈显著正相关;3)土壤全氮和水解性有机氮含量随试验持续而显著增加;4)对于土壤全氮及土壤水解性有机氮而言,阔叶红松林均高于红松人工林,2019年高于2018年。其中采样月份、林型、氮磷沉降和凋落物处理的交互作用对两者的影响更显著。不同氮磷沉降和凋落物处理下,2年间的土壤全氮、酸水解总氮、氨基酸态氮、氨态氮影响显著(P<0.05),土壤氨基糖态氮、酸解未知氮影响不显著(P>0.05)。[Background]To elucidate the effects of simulated nitrogen and phosphorus deposition and litter treatments on soil total nitrogen and hydrolyzed organic nitrogen in Korean pine(Pinus koraiensis)plantations and broad-leaved Korean pine forests,these two treatments of experiments were conducted in 2018 and 2019 within the above two forest types in Liangshui National Nature Reserve,Dailing district,Yichun city,Heilongjiang province.The results may provide scientific basis and data support for predicting the effects of nitrogen and phosphorus deposition and litter change on soil fertility of Korean pine forest ecosystem in this region.[Methods]The simulated nitrogen and phosphorus deposition and litter treatment experiments were carried out.In the former,(NH_(4))_(2)SO_(4) and(NH_(4))_(2)HPO_(4) were used as nitrogen and phosphorus sources for the simulation test,4 levels were set up,3 repetitions were arranged for each level;in the latter,litter treatment was set to 3 levels with 3 replicates per level.Variance analysis was used to reveal the effects of two treatments on soil total nitrogen and hydrolyzed organic nitrogen.[Results]1)Both treatments resulted in the significant effects on soil total nitrogen,but their effects on soil hydrolyzed organic nitrogen varied with experimental time.2)There was a significantly positive correlation between soil total nitrogen and various forms of hydrolytic organic nitrogen.3)Total nitrogen and hydrolyzed organic nitrogen in the soil increased significantly with the experimental duration.4)As for soil total nitrogen and hydrolyzed organic nitrogen,they were higher in broad-leaved Korean pine forest than in Korean pine plantation,and higher in 2019 than in 2018.[Conclusions]Under different nitrogen and phosphorus deposition and litter treatments,the effects on soil total nitrogen,acid hydrolyzed total nitrogen,amino acid nitrogen and ammonia nitrogen were significant(P<0.05),but effects on amino sugar nitrogen and acid hydrolyzed unknown nitrogen was insignificant(P>0.05).

关 键 词：红松人工林 阔叶红松林 氮磷沉降 凋落物 土壤水解性有机氮 土壤全氮 

分 类 号：S714[农业科学—林学]