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Bulletin of Botanical Research ›› 2019, Vol. 39 ›› Issue (4): 598-603.doi: 10.7525/j.issn.1673-5102.2019.04.014

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Effects of Long-term Nitrogen Addition on Soil Enzymes in Larix gmelinii Plantation in Northeast China

MA Peng-Yu1, ZHANG Hong-Guang2, ZAN Peng1, GU Wei-Ping1, WEN Lu-Ning1, ZHANG Zi-Jia3, WENG Hai-Long4, SUN Tao3, MAO Zi-Jun1   

  1. 1. Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040;
    2. Maoershan Experimental Forest Station of Northeast Forestry University, Shangzhi 150611;
    3. Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016;
    4. Heilongjiang Fenglin National Nature Reserve Administration, Wuying 153033
  • Received:2018-11-26 Online:2019-07-05 Published:2019-07-03
  • Supported by:
    National Science Foundation of China(41312304,31500361 and 31700397);Fundamental Research Funds for the Central Universities(2572017AA21)

Abstract: The increase of nitrogen deposition hadbecame a significant ecological factor effecting the material cycle in forest. We examined the effects of nitrogen deposition on soil enzyme activities in inorganic nitrogen addition and control plots in Larix gmelinii(Rupr.) Rupr. plantation, in northeast China. The experiment was divided into two treatment groups, one was control treatment(CK:0 kg·N·hm-2·a-1) and another was inorganic nitrogen treatment(IN:10 kg·N·hm-2·a-1). Each treatment included 3 replicate plots. Over 8 years of inorganic nitrogen addition, our results showed that N fertilization increased the activities of β-1, 4-glucosidase(BG), acid phosphatase(AP), and peroxidase(PER)(5.56%, 8.66% and 0.61%)while reduced the activities of cellobiohydrolase(CBH), leucine aminopeptidase(LAP) and phenol oxidases(POX)(10.71%, 3.85% and 12.30%). The long-term inorganic nitrogen addition treatment had a significant effect on soil enzyme activity and soil carbon, nitrogen and phosphorus cycles(0.80%, 12.66% and -2.25%). Therefore, it is important to include the soil enzyme activity when studying the response of biogeochemical cycle and soil carbon dynamics to climate changein forest ecosystems in future research, while nitrogen deposition increases year by year.

Key words: nitrogen deposition, soil enzyme activity, material cycle, Larix gmelinii(Rupr.) Rupr., plantation

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