Effects of pyroligneous acid on quantity of microorganism and enzyme activity in alkaline soil
CHENG Hu1,2,3, WANG Zi-quan1, ZHOU Kun1, QIAN Shuang1, BIAN Yong-rong2, HE Wen-xiang1, LÜ Jia-long1
1. College of Resources and Environment, Northwest A & F University, Yangling 712100, China; 2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; 3. University of the Chinese Academy of Sciences, Beijing 100049, China
Abstract：A laboratory incubation experiment was conducted to explore the effects of different concentrations of pyroligneous acid on quantities of microorganism and enzyme activity in alkaline soil. Results showed that the quantity of fungi and bacteria in alkaline soil were significantly increased with the presence of pyroligneous acid. Besides, soil enzyme activity was effectively activated within three days. Soil invertase, urease, alkaline phosphatase and dehydrogenase activity were increased to some extent respectively. However, microbial activity in alkaline soils was partly inhibited by high-concentration of pyroligneous acid in a short time. The demand of microbial growth for nitrogen nutrient was increased with the addition of pyroligneous acid, which would cause nutrition competition between crop and microorganism especially in the later incubation period. Consequently, attention should be paid to the concentration of pyroligneous acid and the application of nitrogen to soil simultaneously when using pyroligneous acid.
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