施用炭基肥及生物炭对棕壤有机碳组分的影响

doi:10.3864/j.issn.0578-1752.2018.11.010

Abstract

Abstract: 【Objective】 As an essential indicator of soil quality, soil organic carbon and its fractions play an important role in land productive capacity and crop yield. Based on a 4-year long-term experiment, effects of Biochar-based fertilizer and Biochar treatments on the contents of total organic carbon and its fractions in Brown soil were analyzed to provide scientific basis for controls of soil fertility and organic carbon management. 【Method】 Since 2011, a field experiment was conducted with five different fertilizing treatments: no fertilizer (CK), low amount biochar (C15), high amount biochar (C50), chemical fertilizer (NPK), and biochar-based fertilizer (BBF). Among them, C15 and BBF had the same level of carbon content, and NPK and BBF had the same level of nutrient. At the 4th year (autumn 2014), soil samples at 0-20 cm depth of different fertilization treatments were collected after harvest. Contents of soil total organic carbon, its fractions and peanuts yield were determined by chemical analysis. 【Result】 The results showed that compared with initial soil, soil total organic carbon content (TOC) was significantly increased by 10% and 8% under the biochar-based fertilizer and biochar treatment, respectively. It was increased from 2% to 15% (in biochar-based fertilizer treatment) under the same level carbon or NPK nutrition input. Soil free particulate organic carbon (FPOC) and soil occluded particulate organic carbon (OPOC) contents were significantly increased by applying biochar-based fertilizer or biochar. Compared with the same level carbon input treatments, FPOC and OPOC increased was 43% and 17% by applying biochar-based fertilizer, respectively; compared with the same level NPK nutrition input treatments, FPOC and OPOC increased was 40% and 43%, respectively. Soil mineral organic carbon (MOC) content was increased slightly in all fertilizer treatments, but the difference was not significant. Soil dissolved organic carbon (DOC) content was significantly increased under biochar-based fertilizer and biochar treatments, but there was no significant difference between them. The peanut yield of continuous application of fertilization was199.4-232.9 kg/667m², which was higher than no fertilizer treatment. The peanut yield was the highest when BBF was applied in soil and obviously higher than C15 and NPK treatment 17% and 10%, respectively. 【Conclusion】 Soil total organic carbon, FPOC, OPOC contents were significant increased by applying biochar-based fertilizer or biochar for more years, and the increasing amount under biochar-based fertilizer treatment was more than that under same amount carbon or NPK nutrition input. Soil DOC content was also increased, but there was no significant difference between same amount carbon and NPK nutrition input. Soil MOC content was not affected by applying biochar or fertilizer. The effect of improving peanuts yield was the best when BBF continuously was applied in soil, and it was better than the same level of nutrient treatment and the same level of carbon treatment.

Key words: biochar-based fertilizer, biochar, organic carbon fractions, Brown soil, peanut

GAO MengYu, JIANG Tong, HAN XiaoRi, YANG JinFeng. Effects of Applying Biochar-Based Fertilizer and Biochar on Organic Carbon Fractions and Contents of Brown Soil[J].Scientia Agricultura Sinica, 2018, 51(11): 2126-2135.

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