Characteristics of soil nitrogen mineralization in a Karst primary forest and a secondary forest

ZHAO Wenjun, CUI Yingchun, WU Peng, LIU Yanhui, DING Fangjun, HOU Yiju, SHU Deyuan

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2017, Vol. 41 ›› Issue (05) : 13-17.

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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 (Natural Sciences Edition） ›› 2017, Vol. 41 ›› Issue (05) : 13-17. DOI: 10.3969/j.issn.1000-2006.201612014

Characteristics of soil nitrogen mineralization in a Karst primary forest and a secondary forest

  • ZHAO Wenjun, CUI Yingchun, WU Peng, LIU Yanhui, DING Fangjun*, HOU Yiju, SHU Deyuan
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Abstract

【Objective】This study explored the characteristics of nitrogen(N)mineralization and nitrogen supply capacity in a Karst primary forest and a secondary forest.【Method】A Karst primary forest and a secondary forest were chosen as study sites. Temporal variations in soil N mineralization and nitrification were determined in situ by continuous incubation by using the resin-core method.【Result】① With an increase in incubation time, the content of soil inorganic N in both the primary forest and the secondary forest showed pronounced variation. The NH+4-N contents firstly increased, then decreased and finally increased, while NO-3-N contents generally increased. The NH+4-N was the main form of inorganic N, and accounted for 84.57%-94.31% of the soil inorganic nitrogen. ② The mineralization rate had a ‘V' shape, and its ranges in primary forest and secondary forest were -0.43-0.97 mg/(kg·d)and -0.91-1.43 mg/(kg·d), respectively. Nitrification rates tended to increase, and were 0.21-0.49 mg/(kg·d), 0.03-0.31 mg/(kg·d), respectively. ③ The inorganic N content and rates of net nitrogen mineralization, nitrification, and ammonification in the primary forest were higher than those in the secondary forest. ④ The annual net amount of N mineralization was 170.82 kg/(hm2·a)in the Karst primary forest, 2.48 times that in the secondary forest. Nitrified N in the primary forest and the secondary forest were 95% and 100%, respectively, of mineralized N.【Conclusion】The soil in the Karst forest had a relatively high capacity for supplying N, and soil nitrification played a dominant role in the process of soil N mineralization, indicating that the available N was volatile or easy to leach.

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ZHAO Wenjun, CUI Yingchun, WU Peng, LIU Yanhui, DING Fangjun, HOU Yiju, SHU Deyuan. Characteristics of soil nitrogen mineralization in a Karst primary forest and a secondary forest[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2017, 41(05): 13-17 https://doi.org/10.3969/j.issn.1000-2006.201612014

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