有机物料对红壤团聚体稳定性的影响

试验设置了对照(CK)、秸秆混匀(M-Str)、秸秆覆盖(Str)、生物质炭混匀(BC)和猪粪混匀(SM)5个处理,采用室内培养法研究有机物料种类与施用方式对红壤团聚体稳定性的影响。结果表明,秸秆混匀与猪粪处理下土壤有机碳(SOC)、热水溶性有机碳(HWC)、土壤抗破碎性和团聚体水稳定性(MWD)显著提高(p0.05),而秸秆覆盖对土壤有机碳和土壤团聚体形成的提升作用不明显(p0.05)。相对于对照处理,生物质炭提高了土壤有机碳含量,但对团聚体稳定性的影响不显著(p0.05)。秸秆混匀和猪粪处理下团聚体稳定性的变化与土壤累积呼吸之间存在线性关系(p0.05)。可见,有机物的性质(秸秆、猪粪和生物质炭)与还田方式(混匀和覆盖)对红壤团聚体的稳定性存在显著差异。

Effects of Organic Materials on Soil Aggregation Stability in Red Soil

This paper studied the dynamics of soil aggregation in responses to organic materials and their incorporation methods through a laboratory cultivating experiments.Five treatments were involved:no addition as a control (CK),mixing straw (M-Str),straw mulching (Str),biochar (BC) and swine manure (SM).The results showed that the M-Str and SM treatments significantly increased soil organic carbon (SOC),hot water extractable carbon (HWC),tensile strength (TS) and mean weight diameter (MWD) of aggregate stability (p＜0.05),whereas the Str treatment did not enhance SOC and MWD (p＞0.05).Compared to the CK treatment,the BC treatment did not improve MWD although it increased SOC significantly (p＜0.05).The aggregate stability in the M-Str and SM treatments was linearly related to soil respiration (CO2) (p＞ 0.05).Our results demonstrated that organic materials and their incorporation methods played a critical role in soil aggregate stability.