长期培肥下红壤有机碳组成与团聚体稳定性的关系

发布时间：2018-12-17 09:02

【摘要】：为研究培肥措施对红壤有机碳组成和团聚体稳定性的影响,以及有机碳与团聚体稳定性的关系,通过长期定位实验,选取不同施肥措施(未培肥CK、化肥NPK、化肥+秸秆NPKS和粪肥AM)下的典型红壤为研究对象,分析土壤有机碳组成和团聚体稳定性差异,揭示3种施肥措施下不同层次的有机碳组成和团聚体稳定性的变化规律。结果表明,3种施肥措施均可以提高土壤表层(0~25 cm)有机碳质量分数(尤其是颗粒有机碳),其中AM效果最显著,NPKS次之。不同施肥措施下红壤不同层次的团聚体稳定性顺序为AMNPKSNPKCK。与CK相比,AM处理对表下层(5~15 cm)土壤的总有机碳和团聚体稳定性的提高效果最显著。回归分析表明,颗粒有机碳(POC)与湿筛法平均质量直径以及快速湿润(FW)、慢速湿润(SW)、预湿润震荡(WS)3种处理的平均质量直径的相关性最好(R2=0.79、0.80、0.66、0.81),说明相对于其他组分,颗粒有机碳更有利于降低消散作用以及抵抗机械破碎进而增强团聚体稳定性,是间接评价土壤团聚体稳定性的良好指标。
[Abstract]:In order to study the effects of fertilization measures on the composition of organic carbon and stability of aggregates in red soil, and the relationship between organic carbon and stability of aggregates, different fertilization measures (unfertilized CK, fertilizer NPK,) were selected through long-term location experiment. Typical red soil under fertilizer straw NPKS and manure AM) was studied. The differences of soil organic carbon composition and aggregate stability were analyzed, and the changes of organic carbon composition and aggregate stability of different levels under three fertilization measures were revealed. The results showed that the organic carbon content (especially particulate organic carbon) in soil surface layer (0 ~ 25 cm) could be increased by three fertilization measures. The effect of AM was the most significant, followed by NPKS. The stability order of aggregates in different layers of red soil under different fertilization measures is AMNPKSNPKCK.. Compared with CK, the effect of AM treatment on soil total organic carbon (TOC) and stability of aggregates in the lower layer (515 cm) was the most significant. Regression analysis showed that particulate organic carbon (POC), average mass diameter of wet sieve method and rapid wetting (FW), were slowly wetted (SW),. The correlation of mean mass diameters among the three pre-wetting shock (WS) treatments was the best (R _ 2 / 0.79 ~ (0.80) ~ (0.80) ~ 0.66N _ (0.81), indicating that the mean mass diameters of the three treatments were relative to the other components. Particulate organic carbon is a good index for indirectly evaluating the stability of soil aggregates, which is more conducive to reducing dissipation and resisting mechanical breakage and thus enhancing the stability of aggregates.
【作者单位】：农业部长江中下游耕地保育重点实验室;华中农业大学资源与环境学院;湖北省水利水电科学研究院;
【基金】：国家自然科学基金“典型地带性土壤团聚体抗侵蚀稳定性及其与铁铝氧化物关系”(41471231)
【分类号】：S153.6;S152.4

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