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基于持续10 a的浙江省平湖地区水稻土长期定位试验,研究了长期施肥下水稻土剖面总有机碳(TOC),各粒级有机碳和热水溶性有机碳(HWOC)分布特征,阐明施猪粪影响下土壤有机碳的积累和演化规律。结果表明:①在0～45 cm土层,施猪粪地块土壤总有机碳显著高于对照,且随土层深度的增加,施有机肥使土壤有机碳质量分数提高的幅度越大;②总有机碳和砂粒碳、粉粒碳之间呈显著的正相关性关系(P<0.05),且受土壤粉粒和黏粒对有机碳物理保护容量控制,0～45 cm土层土壤有机碳以砂粒碳为主,45～85 cm土层则以粉粒碳和黏粒碳为主;③施猪粪可提高土壤热水溶性有机碳。
Based on the long-term experiment of paddy soil for 10 years in Pinghu, Zhejiang Province, the distribution characteristics of total organic carbon (TOC), individual fractionated organic carbon and hot-water soluble organic carbon (HWOC) Accumulation and evolution of soil organic carbon under the influence of manure. The results showed that: (1) In 0 ~ 45 cm soil layer, soil total organic carbon in pig manure plot was significantly higher than that in the control. With the increase of soil depth, the organic fertilizer increased the soil organic carbon mass fraction more; There was a significant positive correlation between total organic carbon and grit and grit (P <0.05), and under the control of physical protection capacity of organic carbon from soil silt and clay, soil organic carbon Gritstone was dominant in the soil layers, while the grain-size carbon and clay were dominant in the 45 ~ 85 cm soil layer. (3) Pig manure was applied to increase soil hot-water soluble organic carbon.