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不同林龄杨树人工林土壤有效氮对 模拟氮沉降的初期响应(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2016年01期
Page:
15-21
Column:
专题报道
publishdate:
2016-01-31

Article Info:/Info

Title:
The short-term responses of soil available nitrogen to simulated nitrogen deposition in Populus plantations at different ages
Article ID:
1000-2006(2016)01-0015-07
Author(s):
WANG Wenjuan1 ZHAO Chao1 YANG Xin1 YU Shuiqiang1* 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
Keywords:
nitrogen deposition poplar plantations forest age ammonium nitrogen nitrate nitrogen
Classification number :
S714
DOI:
10.3969/j.issn.1000-2006.2016.01.003
Document Code:
A
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.

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Last Update: 2016-02-25