The short-term responses of soil available nitrogen to simulated nitrogen 
deposition in Populus plantations at different ages

doi:10.3969/j.issn.1000-2006.2016.01.003

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (01): 15-21.doi: 10.3969/j.issn.1000-2006.2016.01.003

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The short-term responses of soil available nitrogen to simulated nitrogen deposition in Populus plantations at different ages

WANG Wenjuan¹, ZHAO Chao¹, YANG Xin¹, YU Shuiqiang^1*, CAO Guohua²

1.Co-Innovation Center for the Sustainable Forestry in Southern China, Jiangsu Provincal Key Laboratory of Forestry Ecological Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037,China;
2.Dongtai Forest Farm of Jiangsu Province, Dongtai 224200, China

Online:2016-02-18 Published:2016-02-18

Abstract

Abstract: In order to understand the response model and feedback mechanisms of the forest ecosystem to continued increasing of nitrogen and rapid nitrogen cycle, simulating nitrogen deposition by using five treatments including N₀(0 g/(m²·a)), N₁(5 g/(m²·a)), N₂(10 g/(m²·a)), N₃(15 g/(m²·a)), N₄(30 g/(m²·a))in the field, we conducted a field-based experiment to examine the soil available nitrogen(N)contents and its response to nitrogen deposition in Populus plantation with different stand ages(6, 10 and 16 years old)in the coastal plain of Dongtai, Jiangsu Province. The results showed that: ① In the young, middle-aged and over mature plantation, ammonium nitrogen(NH⁺_<sub>4-N)contents accounted for 18.50%-28.81%, 23.14%-34.52% and 32.60%-49.92% of total available nitrogen, respectively. ② Soil nitrate nitrogen(NO^-₃-N)contents in three plantations presented a significant increasing trend with the increasing of exogenous nitrogen, moreover, the impact of NO₃^--N in the high nitrogen treatment was higher than that in the low nitrogen treatment. The NH⁺₄-N contents had significant difference in high nitrogen(N₃ and N₄)only between young and middle age plantation. ③ The responses of the soil NO^-₃-N contents in young plantation were more sensitive to nitrogen deposition than that in middle age and over mature plantations, while NH⁺₄-N had no significant regularity among different forest ages.④ The responses of soil NH⁺₄-N and NO^-₃-N contents in the soil surface layer(0-10 cm)to nitrogen deposition were more sensitive than that in deeper layers.

CLC Number:

S714

WANG Wenjuan, ZHAO Chao, YANG Xin, YU Shuiqiang, CAO Guohua. The short-term responses of soil available nitrogen to simulated nitrogen deposition in Populus plantations at different ages[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2016, 40(01): 15-21.

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The short-term responses of soil available nitrogen to simulated nitrogen deposition in Populus plantations at different ages

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