| 摘要: 摘 要：为探究不同比例化肥减量配施有机肥影响植烟土壤有机碳固存的长期效应,基于连续9年的田间定位试验,设置不施肥（CK）、100%化肥（CF-1：当地常规推荐施肥）、80%化肥（CF-2）、80%化肥配施有机肥（OF-1）、60%化肥配施有机肥（OF-2）、70%化肥配施有机肥+生物有机肥（BOF）处理,对植烟土壤有机碳储量盈亏、固碳速率、有机碳组分含量、有机碳敏感指数、土壤碳库活度和土壤碳库管理指数进行对比，探讨不同比例化肥减量配施有机肥对植烟土壤有机碳固存的长期效应。与CF-1处理相比，连续不施肥（CK）处理植烟土壤有机碳组分、储量和土壤碳固存速率显著下降。不同比例化肥减量配施有机肥的 OF-1、OF-2和BOF处理，植烟土壤有机碳含量分别增加了9.6%、20.9%和13.9%，土壤活性有机碳含量分别增加了43.4%、68.0%和41.7%，土壤可溶性有机碳含量分别增加了14.8%、19.1%和25.4%，土壤微生物量碳含量分别增加了22.8%、37.2%和36.4%，土壤有机碳储量分别增加15.3%、30.2%和31.2%，年平均固碳速率分别提高191.3%、382.6%和391.3%，碳库管理指数分别提高100.8%、159.8%和79.6%。连续不同比例化肥减量配施有机肥显著提升土壤活性有机碳敏感指数。与CF-1相比， OF-1、OF-2和BOF处理的烟叶产量分别提高10.3%、33.5%和35.3%，中上等烟叶比例分别提高14.6%、22%和18%。连续9年化肥减量配施有机肥显著提高植烟土壤有机碳组分含量和土壤有机碳固存速率，促进烟叶产质量提升，是烟叶绿色优质生产、农田土壤固碳增效的有效途径，以OF-2和BOF效应更好。 |
| 关键词: 土壤有机碳组分、有机碳固存速率、土壤有机碳储量、碳库管理指数、碳组分敏感指数 |
| 中图分类号:S-3；S143; S572 |
| 基金项目:国家重点研发计划课题（2022YFD1901503），云南省重大科技专项计划（202202AE090025，202102AE090030）, |
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| Effects of different proportions of chemical fertilizer reduction combined with organic fertilizer supplements on organic carbon sequestration in Tobacco-planting soil |
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Xiongyubin, Yu Shunpin, Yang Ya, Huang Lin, Yu Haibin, Tang Li
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Yunnan Agricultural University
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| Abstract: Abstract: The long-term effects of different proportions of fertilizer reduction combined with organic fertilizer on organic carbon sequestration in tobacco-planting soil were explored. Based on nine consecutive years of field positioning experiments, treatments of no fertilizer (CK), 100% fertilizer (CF-1: Local conventional recommended fertilizer), 80% fertilizer (CF-2), 80% fertilizer with organic fertilizer (OF-1), 60% fertilizer with organic fertilizer (OF-2), 70% fertilizer with organic fertilizer + bioorganic fertilizer (BOF) were applied to compare organic carbon storage profit and loss, carbon sequestration rate, organic carbon component content, organic carbon sensitivity index, soil carbon pool activity and soil carbon pool management index of tobacco-planting soil, and to explore the long-term effects of different proportions of fertilizer reduction combined with organic fertilizer supplements on organic carbon sequestration in tobacco-planting soil. The organic carbon composition, storage and soil carbon sequestration rate of tobacco-planting soil under continuous no-fertilization (CK) treatment were significantly lower when compared with CF-1. The organic carbon content of tobacco-planting soil increased by 9.6%, 20.9% and 13.9%, the active organic carbon content of soil increased by 43.4%, 68% and 41.7%, respectively. Soil soluble organic carbon content increased by 14.8%, 19.1% and 25.4%, soil microbial biomass carbon content increased by 22.8%, 37.2% and 36.4%, soil organic carbon storage increased by 15.3%, 30.2% and 31.2%, respectively. The average annual carbon sequestration rate was increased by 191.3%, 382.6% and 391.3%, respectively，the carbon pool management index was increased by 100.8%, 159.8% and 79.6 %, respectively. Continuous fertilizer reduction with different proportions combined with organic fertilizer significantly increased the sensitivity index of soil active organic carbon. Compared with CF-1, the yield of tobacco leaf increased by 10.3%, 33.5% and 35.3% and the proportion of medium and high-grade tobacco leaf increased by 14.6%, 22% and 18%, respectively, among the three fertilizer treatments. After nine consecutive years of fertilizer reduction and supplementation with organic fertilizer, the organic carbon component content and soil organic carbon sequestration rate of tobacco-planting soil were significantly increased and the quality of tobacco production was promoted. This approach was an effective way to produce green and high-quality tobacco leaves and increase the efficiency of soil carbon sequestration. The treatments OF-2 and BOF showed the much better effects. |
| Keyword: Soil organic carbon component, organic carbon sequestration rate, soil organic carbon storage, carbon pool management index, carbon component sensitivity index |