Effects of soil fauna on seasonal variations of soil N mineralization under different land use type

ZHANG Wenwen, XIAO Hanran, YANG Baoling, DONG Kejia, RUAN Honghua, ZHENG Abao,SHEN Caiqin, CAO Guohua

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (06) : 20-26.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (06) : 20-26. DOI: 10.3969/j.issn.1000-2006.2016.06.004

Effects of soil fauna on seasonal variations of soil N mineralization under different land use type

  • ZHANG Wenwen1,2, XIAO Hanran1, YANG Baoling1,3, DONG Kejia1, RUAN Honghua1*, ZHENG Abao1,4,SHEN Caiqin5, CAO Guohua5
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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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ZHANG Wenwen, XIAO Hanran, YANG Baoling, DONG Kejia, RUAN Honghua, ZHENG Abao,SHEN Caiqin, CAO Guohua. Effects of soil fauna on seasonal variations of soil N mineralization under different land use type[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2016, 40(06): 20-26 https://doi.org/10.3969/j.issn.1000-2006.2016.06.004

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