施用不同改良材料对黄土区空心村复垦土壤结构和有机质含量的影响
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S156.2;S158.5

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陕西省土地工程建设集团内部科研项目“不同有机物料处理下土壤团聚体稳定性的内力作用机制”(DJNY2020-25); 陕西省土地工程建设集团内部科研项目(DJNY2022-15, DJNY2022-35, DJTD-2022-5), 陕西地建—西安交大土地工程与人居环境技术创新中心开放基金资助项目(2021WHZ0092)


Effects of Different Amendment Materials on Reclaimed Soil Structure and Organic Matter Content of Hollow Village in Loess Region
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    摘要:

    [目的] 解决黄土区空心村废弃宅基地复垦土壤结构不良,肥力低下的严重问题,为空心村复垦土壤的质量提升提供理论依据。[方法] 选取6种不同改良材料处理进行了5 a的田间定位试验,分析了对照(CK)、熟化剂(TM)、粉煤灰(TF)、有机肥(TO)、熟化剂+粉煤灰(TMF)、熟化剂+有机肥(TMO)、粉煤灰+有机肥(TFO)处理对复垦土壤结构稳定性和有机质含量的改善效应。[结果] 与对照处理相比,长期施用不同改良材料后空心村复垦土壤有机质含量明显增加,促使水稳性微团聚体(<0.25 mm)胶结形成水稳性大团聚体(>0.25 mm),水稳性大团聚体含量均呈增加趋势。在0—15 cm土层,TM,TF,TO,TMF,TMO,TFO处理下水稳性大团聚体含量分别比CK处理增加了328.2%,130.0%,87.8%,81.1%,36.7%,12.2%。TF,TO,TMF,TMO,TFO处理显著增加了土壤团聚体平均重量直径(MWD)、几何平均直径(GMD)值,降低了不稳定团粒指数(ELT)、分形维数(D)(p<0.05)。土壤有机质含量与MWD,GMD,>2 mm粒级水稳性团聚体含量呈极显著正相关关系,与ELTD,<0.25粒级水稳性微团聚含量呈极显著负相关。其中,粉煤灰+有机肥处理下空心村复垦土壤的水稳性大团聚体和有机质含量最高,土壤结构稳定性提升效果最好。[结论] 在黄土区空心村废弃宅基地复垦土壤整治中,粉煤灰+有机肥的有机无机结合处理是黄土区空心村复垦土壤结构改善和肥力提升适宜的改良措施。

    Abstract:

    [Objective] The poor structure and low fertility of reclaimed soil of abandoned homesteads in hollow villages in the loess area were addressed in order to provide a theoretical basis for improving the quality of reclaimed soils. [Methods] The effects of six different treatments of modified materials on structural stability and soil organic matter (SOM) of a reclaimed soil were compared with a control (CK) treatment in a five-year field experiment. The modified materials treatments were maturing agent (TM), fly ash (TF), organic fertilizer (TO), maturing agent + fly ash (TMF), maturing agent + organic fertilizer (TMO), and fly ash + organic fertilizer (TFO). [Results] SOM content was significantly increased (compared with CK) after the application of the different modified materials that promoted the cementation and aggregation of water-stable microaggregates (<0.25 mm) into water-stable macroaggregates (>0.25 mm). The content of water-stable macroaggregates showed an increasing trend. In the 0—15 cm soil layer, the contents of water-stable macroaggregates under TM, TF, TO, TMF, TMO, and TFO were increased by 328.2%, 130.0%, 87.8%, 81.1%, 36.7%, and 12.2%, respectively, compared with CK. Moreover, the application of the TF, TO, TMF, TMO, and TFO treatments significantly increased the mean weight diameter (MWD) and geometric mean diameter (GMD) of soil aggregates, while the unstable-aggregate index (ELT) and fractal dimension (D) were decreased (p<0.05). SOM content was significantly positively correlated with MWD, GMD, and >2 mm water-stable aggregates, and significantly negatively correlated with the ELT, D, and water-stable microaggregates. In particular, reclaimed soil under TFO had the highest content of SOM and water-stable macroaggregates, and the best effect on improving soil structrual stability. [Conclusion] Using a combination of organic fertilizer and fly ash is an appropriate practice to improve reclaimed soil structure and fertility of abandoned homesteads in hollow villages in the loess region.

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刘哲,王欢元,孙婴婴,孙增慧,张瑞庆.施用不同改良材料对黄土区空心村复垦土壤结构和有机质含量的影响[J].水土保持通报,2022,42(5):16-24

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  • 收稿日期:2022-01-26
  • 最后修改日期:2022-03-14
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  • 在线发布日期: 2022-11-22
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