| 引用本文: | 吴雨晴,郑春莲,孙景生,等.长期咸水灌溉对棉田土壤水稳性团聚体的影响[J].灌溉排水学报,2020,39(9):58-64. |
| WU Yuqing,ZHENG Chunlian,SUN Jingsheng,et al.长期咸水灌溉对棉田土壤水稳性团聚体的影响[J].灌溉排水学报,2020,39(9):58-64. |
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| 摘要: |
| 【目的】探明不同矿化度咸水长期灌溉对棉田土壤水稳性团聚体的影响。【方法】基于10 a咸水定位灌溉试验，设置6组灌水矿化度水平：1 g/L（CK）、2 g/L（T1）、4 g/L（T2）、6 g/L（T3）、8 g/L（T4）、10 g/L（T5），分析了各处理棉田0~30 cm土层土壤盐分质量分数（S）以及>0.25 mm水稳性团聚体含量（R0.25）、平均重量直径（MWD）、几何平均直径（GMD）和分形维数（D）。【结果】土壤盐分随灌溉水矿化度的增加而增大，棉花生长前期土壤盐分随土层深度的增加呈降低趋势；生长后期各土层土壤盐分整体降低，且随土层变化的趋势与前期相反。>0.25 mm水稳性团聚体量、MWD及GMD均表现为随灌水矿化度的增加而减小的趋势，而D则随灌水矿化度的增加呈增大的趋势。经过生育期降雨淋盐、土壤自然沉降等作用，棉田土壤水稳性团聚体得到恢复，棉花生长后期大团聚体数量、MWD、GMD较前期均有所回升，D有所下降，以10~20 cm土层恢复效果最为显著。与CK相比，T1、T2、T3处理棉田不同时期不同土层的水稳性团聚体指标差异均不显著。【结论】＜6 g/L的咸水灌溉棉田土壤积盐较少，对土壤水稳性团聚体破坏程度较小。 |
| 关键词: 咸水灌溉；土壤盐分；土壤水稳性团聚体；稳定性指标 |
| DOI：10.13522/j.cnki.ggps.2019193 |
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| The Effects of Long-term Saline Water Irrigation on Stability of Soil Aggregates in a Cotton Field |
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WU Yuqing, ZHENG Chunlian, SUN Jingsheng, LI Kejiang, DANG Hongkai, ZHANG Junpeng
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1. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian 271018, China;2. Key Laboratory of Crop Drought Resistance Research of Hebei Province/Institute of Dryland Farming, Hebei Academy of Agriculture and Forestry Sciences, Hengshui 053000, China; 3. Key Laboratory for Crop Water Requirement and Regulation of the Ministry of Agriculture and Rural Affairs/Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
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| Abstract: |
| 【Objective】Saline water is widely distributed in the world and has been used in combination with fresh water to irrigate crops. This paper aims to study the impact of saline water irrigation on stability of soil aggregates in a cotton field.【Method】The field experiment was conducted at a cotton field in north China plain that has been irrigated with saline water for a decade. We compared irrigation with six salt concentrations: 1 g/L (CK), 2 g/L (T1), 4 g/L (T2), 6 g/L (T3), 8 g/L (T4) and 10 g/L (T5). In each treatment, we measured soil salinity in the top 0~30 cm soil layer, content of water-stable aggregates >0.25 mm (R0.25), the mean weight diameter (MWD) and mean geometric diameter (GMD) of the aggregates, as well as their fractal dimension (D).【Result】Soil salinity increased with salt concentration of the irrigation water and decreased with soil depth at early growth stage of the cotton. At the late stage, soil salinity in the subsoil was higher than that in the topsoil and the overall soil salinity was lower than that at the early growth stage. As salt concentration in the irrigation water increased, the content of water-stable aggregates >0.25 mm, MWD and GMD all decreased while D increased. Salt leaching by rainwater and soil consolidation due to root growth combined to enhance soil aggregation, which improved soil quality and led to an increase in numbers of large aggregates, MWD and GMD and a decrease in D, especially in top 10~20 cm soil. 【Conclusion】Irrigating with saline water by keeping the salt concentration lower than 6 g/L did not result in a significant salt accumulation in the topsoil and had less damage to soil aggregates in the cotton field. |
| Key words: saline water irrigation; soil salt; water-stable soil aggregates; stability index |
