| Effects of returning different organic materials to soil on stoichiometric characteristics and extracellular enzyme activities of albic soil |
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| DOI：10.7606/j.issn.1000-7601.2024.05.20 |
| Key Words: albic soil organic materials returning soil stoichiometric ratios soil extracellular enzyme activity soil microbial nutrients limitation |
| Author Name | Affiliation | | GAO Ruimin | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China
College of Advanced Agricutural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | YAN Jun | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China
College of Advanced Agricutural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | HAN Xiaozeng | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China | | CHEN Xu | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China
College of Advanced Agricutural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | ZOU Wenxiu | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China
College of Advanced Agricutural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | LU Xinchun | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China
College of Advanced Agricutural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | XU Mengqi | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China
College of Forestry, Northeast Forestry University, Harbin, Heilongjiang 150040, China | | YANG Shuchun | Key Laboratory of Black Land Protection and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China
College of Advanced Agricutural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | JIANG Rui | Agricultural Technology Extension Center of Beidahuang Group 852 Company, Shuangyashan, Heilongjiang 155100, China |
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| Abstract: |
| To explore the effects of different organic materials returning on soil stoichiometric characteristics and extracellular enzyme activities in albic soil, a two\|year positioning experiment was conducted in the albic soil region of Northeast China. Four treatments were established: conventional tillage control (CK, with no straw and organic fertilizer addition), straw returning (S), organic fertilizer returning (M) and straw combined with organic fertilizer returning (SM). The results indicated that, compared with the control, the application of organic materials increased soil organic carbon, total nitrogen, and total phosphorus contents increased by 1.81%~6.91%, 1.54%~7.48%, and 2.04%~7.26%, respectively, but had no significant effect on soil C∶N, C∶P and N∶P ratios. Furthermore, the application of organic materials significantly increased the activities of soil carbon, nitrogen and phosphorus acquisition enzymes, with the most pronounced increase observed in soil nitrogen acquisition enzyme activity, ranging from 60.03% to 131.15%. Notably, the effect of organic fertilizer returning to the field and straw combined with organic fertilizer returning on the three soil acquisition enzymes was better than that of straw returning treatment. The results from the extracellular enzyme stoichiometric scatter plot showed that the soil microbial community was jointly limited by carbon and phosphorus, and the input of organic materials could alleviate this limitation. Based on random forest analysis, it was discovered that soil available phosphorus, available nitrogen, microbial biomass carbon, microbial biomass nitrogen and microbial biomass phosphorus were important factors affecting soil microbial carbon and phosphorus limitation indicators. |
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