Effects of simulated nitrogen and phosphorus deposition and litter treatment on the soil total nitrogen and organic nitrogen in Pinus koraiensis forest
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
Abstract：[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, (NH4) 2SO4 and (NH4) 2HPO4 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).
王美娟, 段文标, 陈立新, 曲美学, 王亚飞, 杨永超, 潘磊, 石金永. 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[J]. 中国水土保持科学, 2022, 20(5): 56-65.
WANG Meijuan, DUAN Wenbiao, CHEN Lixin, QU Meixue, WANG Yafei, YANG Yongchao, PAN Lei, SHI Jinyong. Effects of simulated nitrogen and phosphorus deposition and litter treatment on the soil total nitrogen and organic nitrogen in Pinus koraiensis forest. SSWC, 2022, 20(5): 56-65.
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