| Effects of corn straw returning methods on content and components of soil water soluble organic carbon in the semiarid black soil region of northeast China |
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| DOI：10.7606/j.issn.1000-7601.2024.03.14 |
| Key Words: straw returning method soil organic carbon water soluble organic carbon fluorescent structure black soil region of northeast China |
| Author Name | Affiliation | | GAO Pan | Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang 161006, China | | SHEN Huibo | Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang 161006, China | | WANG Yuxian | Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang 161006, China | | CAI Shanshan | Heilongjiang Province Black Soil Protection and Utilization Research Institute, Harbin, Heilongjiang 150086, China | | XU Yingying | Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang 161006, China | | YANG Huiying | Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang 161006, China | | WANG Chen | Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang 161006, China | | ZHANG Gongliang | Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang 161006, China |
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| Abstract: |
| To examine the changes in soil organic carbon components under different straw returning methods, based on a 6-year straw returning long\|term positioning experiment, three\|dimensional fluorescence spectroscopy technology was used to analyze the content and structural characteristics of soil organic carbon (SOC) and water\|soluble organic carbon (WSOC). The treatments included no straw returning (CK), straw covering returning (FG), and straw burying returning (FM). The results showed that: (1) Compared with CK, FM treatment increased the SOC content in the 0~40 cm soil layer by 7.87%~29.54%, FG treatment increased the SOC content in the 0~30 cm soil layer by 1.91%~18.61%, and the SOC content in the 30~40 cm soil layer decreased by 7.67%. The WSOC content in the 0~40 cm soil layer increased by 13.42% to 39.42% and 0.28% to 26.34% respectively after FM and FG treatments. (2) The WSOC three\|dimensional fluorescence spectroscopy found that the fluorescence characteristic peaks of CK (Ex/Em=300/340, Ex/Em=300/340, Ex/Em=240/340, Ex/Em=300/340) in various soil layers were soluble microbial metabolites and tryptophan like protein substances. FM (Ex/Em=340/430, Ex/Em=340/430,Ex/Em=340/435, Ex/Em=340/435)and FG (Ex/Em=270/440, Ex/Em=270/435, Ex/Em=340/435, Ex/Em=340/430) were fluorescent characteristic peaks of humic acid like substances, with a high degree of humification and a complex structure. The fluorescence region integration showed that FM and FG treatments increased the integration percentages of humic acid like substances (V) and fulvic acid like substances (III) by 12.18% to 27.39%, 11.98% to 30.72%, and 3.96% to 5.73%, 2.99% to 5.40%, respectively, compared with CK.(3) Soil WSOC consists of two components: C1 (Ex/Em=340/435, 270/435) component was composed of humic acid like substances, and C2 (Ex/Em=290/345, 240/345) component was composed of soluble microbial metabolites and tryptophan like protein substances. The Fmax value results indicated that the relative content of C1 component in the 0~40 cm soil layer was FM>FG>CK, suggesting that burying and returning straw to the field was more conducive to increasing the nutrient content in the soil and forming higher molecular weight organic matter. In summary, different straw returning methods increased the content of soil SOC and WSOC and the degree of humification and strengthened the soil’s fertilizer supply capacity. However, the improvement effect of burying and returning farmland was more significant. |
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