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不同土地利用类型土壤动物对土壤氮矿化季节变化的影响(PDF)

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

Issue:
2016年06期
Page:
20-26
Column:
专题报道
publishdate:
2016-11-30

Article Info:/Info

Title:
Effects of soil fauna on seasonal variations of soil N mineralization under different land use type
Article ID:
1000-2006(2016)06-0020-07
Author(s):
ZHANG Wenwen12 XIAO Hanran1 YANG Baoling13 DONG Kejia1 RUAN Honghua1* ZHENG Abao14SHEN Caiqin5 CAO Guohua5
1.Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China;
2.Shanghai Forestry Station, Shanghai 200072, China;
3. Jiangsu Polytechnic College of Agriculture and Forestry, Jurong 212400,China;
4. Jiangsu Province Administration of Forestry, Nanjing 210036, China;
5. Forest Farm of Dongtai City, Dongtai 224200, China
Keywords:
land use type soil fauna net N mineralization rate seasonal variation coastal area of northern Jiangsu Province
Classification number :
S714; S718
DOI:
10.3969/j.issn.1000-2006.2016.06.004
Document Code:
A
Abstract:
A field experiment was conducted under three different land use types(i.e. poplar plantation, cropland and crop-poplar integrated system)with three treatments including control, nematodes exclusion and soil fauna exclusion in a coastal area of northern Jiangsu. By application closed-up incubation method, the seasonal variations of soil mineral N and net N mineralization rate were analyzed. The results showed that the contents of NH+4-N,NO-3-N,TMN had significant seasonal variations under three land uses types(P<0.05), nematodes and soil fauna exclusions decreased the contents of NH+4-N,NO-3-N and TMN in four seasons, but did not alter their seasonal variation trends. The seasonal variation of NH+4-N under three land uses types all showed summer>autumn>spring>winter; seasonal variation of NO-3-N and TMN showed summer>autumn>spring>winter under poplar plantation and crop-poplar integrated system while autumn>summer >spring>winter in cropland. In all sites, soil net N mineralization rates showed significant seasonal dynamic(P<0.05). Maximum soil net N mineralization rate both under poplar plantation and cropland appeared in autumn(0.25 mg/(kg·d), 0.29 mg/(kg·d), respectively), but in crop-poplar integrated system, the maximum soil net N mineralization rate appeared in summer(0.45 mg/(kg·d)). Nematode and soil fauna exclusion all could lower the net N mineralization rates of three land use types in spring, summer and autumn, while did not alter the net N mineralization rates under crop-poplar integrated system, but soil fauna exclusion affected the seasonal dynamics of net N mineralization rates under the poplar plantation and cropland. The net N mineralization rates under poplar plantation and cropland showed summer>autumn>spring>winter with soil fauna exclusion, while autumn>summer>spring>winter with control. Analysis of variance for repeated measurement showed that there were significant interaction effects between sampling times and soil fauna treatments(P<0.01), indicating that soil fauna may affect the seasonal variations of net N mineralization rates.

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Last Update: 2016-11-20