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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (8): 2693-2702.doi: 10.13287/j.1001-9332.202108.041

• Special Features of Conservation Tillage • Previous Articles     Next Articles

Effects of biochar application patterns on soil nutrients and nitrogen- and phosphorus-related enzyme activities in Phaeozem and Luvisol

LIU Xing1,2,3,4, WU Guo-hui1,2,3,4, ZHANG Yu-lan1,3,4, XIE Hong-tu1,3,4, CHEN Zhen-hua1,3,4*, CHEN Li-jun1,3,4   

  1. 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2University of Chinese Academy of Sciences, Beijing 100049, China;
    3Key Lab of Conservation Tillage & Ecological Agriculture, Liaoning Pro-vince, Shenyang 110016, China;
    4National Field Observation and Research Station of Shenyang Agro-ecosystems, Shenyang 110016, China
  • Received:2020-10-29 Accepted:2021-06-12 Online:2021-08-15 Published:2022-02-15
  • Contact: *E-mail: zhchen@iae.ac.cn
  • Supported by:
    National Key R&D Program of China (2018YFD0200603, 2017YFD0200800) and the National Natural Science Foundation of China (4130135).

Abstract: We investigated the effects of different biochar application patterns on soil nutrient contents and element transformation, with soil samples being collected from two five-year field experiments in Phaeozem and Luvisol amended with biochar at annual low-rate (AL, 22.5 t·hm-2·a-1) and intervalic high-rate (IH, 112.5 t·hm-2·5 a-1). Changes of soil total carbon (C), nitrogen (N) and phosphorus (P) contents as well as the related enzyme activities were measured under different biochar application patterns to provide fundamental information for the straw utilization and soil fertility improvement in agroecosystem. Results showed that total C and organic N contents in AL treatment were significantly higher than those in IH treatment in Phaeozem soil. Compared with the control, the decreases of dehydrogenase activity in AL treatment was more pronounced than that in IH treatment in Phaeozem soil, and the increases of protease activity in IH treatment was pronounced than that in AL treatment in Luvisol. Compared with Luvisol soil, the application of biochar had stronger effect on total soil C and organic N contents in Phaeozem soil. Application of biochar significantly increased the activities of soil dehydrogenase and protease in Luvisol soil, but decreased the activity of soil dehydrogenase. Soil types and biochar application patterns interacted to affect soil C and N contents, microbial metabolic activity, N- and P-related enzyme activities. In summary, soil types and biochar addition affected soil properties and microbial characteristics, which would provide important information for straw application and soil management.

Key words: biochar, soil nitrogen and phosphorus nutrients, enzyme activity, soil fertility, application pattern