| 引用本文: | 吴雨晴,郑春莲,李科江,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,0,():-. |
| Wu Yuqing,Zheng Chunlian,Li Kejiang,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,0,():-. |
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| 摘要: |
| 【目的】探明不同矿化度咸水长期灌溉对华北平原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】结果表明：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水稳性团聚体含量、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现增大的趋势。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处理相比，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】综合试验结果，＜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： |
| 分类号:S152.4 |
| 基金项目:国家自然科学(51609248,51179193)；现代农业棉花产业技术体系建设专项资金资助项目(CARS-15-13) |
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| Effects of long-term saline water irrigation on soil water-stable aggregates in cotton fields |
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Wu Yuqing1, Zheng Chunlian2, Li Kejiang2, Dang Hongkai2, Cao caiyun2, Ma junyong3, Zhang Junpeng1
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1.College of Water Conservancy and Civil Engineering, Shandong Agricultural University;2.Key Laboratory of Crop Drought Resistance Research of Hebei Province/Institute of Dryland Farming, Hebei Academy of Agriculture and Forestry Sciences;3.Key Laboratory of Crop Drought Resistance Research of Hebei Province/Institute of Dryland Farming, Hebei Academy of Agriculture and Forestry SciencesKey Laboratory of Crop Drought Resistance Research of Hebei Province/Institute of Dryland Farming, Hebei Academy of Agriculture and Forestry Sciences
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| Abstract: |
| 【Objective】This paper aimed to understand the impact of saline irrigation on soils water-stable aggregates.【Method】A field study was conducted at North China Plain, where saline water has been used for irrigation for 10 years. The study evaluated the effects of long-term saline water irrigation with different salinity level on soil salinity and water-stable aggregates in cotton fields. Six groups of irrigation salinity levels were set up: 1 g/L (CK), 2 g/L (T1), 4 g/L (T2), 6 g/L (T3), 8 g/L (T4), 10 g/L (T5). The salinity of 0~30 cm soil layer and the content of >0.25 mm water-stable aggregates, mean weight diameter (MWD), geometric average diameter (GMD) and fractal dimension (D) were analyzed. 【Result】Soil salinity increased with the increase of irrigation water salinity, and decreased with the increase of soil depth in the early growth stage of cotton. By contrast, the soil salinity decreased in each soil layer, and showed a trend of decreasing with the increase of soil depth in the later growth stage. The content of >0.25 mm water-stable aggregates, MWD and GMD decreased with the increase of irrigation water salinity, while D increased with the increase of irrigation salinity. After the improvement of soil environment, such as the leaching of salts by rainwater and natural soil subsidence during the growth period, the soil water-stable aggregates in cotton field were restored, and the number of large aggregates, MWD and GMD in the later growth period of cotton increased compared with the earlier growth period, and D decreased, with the recovery effect of 10~20 cm soil layer being the most remarkable. 【Conclusion】Comprehensive test results showed that saline water irrigation with <6 g/L made less salt accumulation, and had less damage to soil water-stable aggregates in cotton field. |
| Key words: saline water irrigation; soil salt; soil water-stable aggregates; stability index |
