摘要：Niemi R.M., Heiskanen I. & Saarnio S. 2015: Weak impacts of biochar amendment on soil enzyme activities in mesocosms in bare or Phleum pratense soil. Boreal Env. Res. 20: 324–334. Addition of biochar to soil is studied for the sustainable agriculture. We studied the impact of biochar addition on soil enzyme activities in bare soil and in soil with growing Phleum pratense during one season in two experiments, each with different soil types. Enzyme activities were monitored in mesocosms after germination (dry period) and, with fully grown plants, during dry and wet periods. Enzyme activities were high in wet conditions in both soils with growing plants, with or without biochar. Bare soils with or without biochar yielded low activities. In sandy till, alanine and leucine aminopeptidase activities decreased in biochar-treated soil, but not in the medium-fine sand. β-N-acetyl-D-glucosaminidase and phosphomonoesterase activities were enhanced in biochar-treated medium-fine sand. The effects of plant, season and soil type on the enzyme activities were clear and frequently observed, whereas the effects of biochar were only few and weak.
