Wang Lei,Liu Qingyi,Shi Jingpan,et al.Effects of Different Vegetation Types on Soil Aggregate Stability in Riparian Zone of Plain Sandy Area[J].Research of Soil and Water Conservation,2024,31(01):96-104.[doi:10.13869/j.cnki.rswc.2024.01.011]
平原沙土区河岸带不同植被类型对土壤团聚体稳定性的影响
- Title:
- Effects of Different Vegetation Types on Soil Aggregate Stability in Riparian Zone of Plain Sandy Area
- 文章编号:
- 1005-3409(2024)01-0096-09
- 分类号:
- S152.4
- 文献标志码:
- A
- 摘要:
- [目的]明晰不同植被类型对土壤团聚体稳定性及团聚体有机碳含量的影响,为平原沙土区河岸带土壤团聚体稳定性和抗蚀能力提升提供基础数据。[方法]以江苏省平原沙土区丰县复新河河岸带15年生杨树纯林、柳树纯林、杨柳混交林3种植被类型及对照为对象,用湿筛法对0—20 cm,20—40 cm,40—60 cm 3个层次土壤颗粒进行物理分级,测定了>0.25 mm团聚体含量(R0.25)、平均重量直径(MWD)、几何平均直径(GMD)、分形维数(D)及有机碳等主要指标,并利用线性回归对各指标相关性进行分析。[结果](1)试验地各土层团聚体以<0.25 mm微团聚体为主,占总团聚体含量的50.33%～80.00%。3种植被类型>2 mm和0.25～2 mm粒径团聚体含量高于对照,各土层中杨树纯林>2 mm大团聚体含量最高。(2)与对照相比,3种植被类型R0.25,MWD和GMD分别提高了41.77%～91.28%,29.89%～79.08%和37.60%～94.32%,其中杨树纯林效果最好。杨树纯林和柳树纯林D显著低于对照(p<0.05)。(3)试验地土壤团聚体有机碳含量范围为1.51～6.48 g/kg。与对照相比,3种植被类型下土壤团聚体有机碳含量提高了31.67%～71.68%,杨树纯林团聚体有机碳含量显著高于柳树纯林和杨柳混交林(p<0.05)。杨树纯林在0—20 cm土层各粒径团聚体有机碳含量最高。(4)线性回归分析表明土壤团聚体稳定性与有机碳显著相关,尤其是与大团聚体有机碳含量显著相关。此外,细根生物量、全氮含量、碳氮比和含水率也是影响团聚体稳定性的重要因素。[结论]平原沙土区河岸带杨树纯林更有利于提高土壤团聚体稳定性,增加土壤抗蚀能力。
- Abstract:
- [Objective] This study aims to investigate the effects of vegetation types on the stability and organic carbon distribution in different soil aggregate components, and to provide the data about soil aggregate stability and erosion resistance in the riparian zone of plain sandy area. [Methods] Three riparian vegetation types(pure poplar plantation, pure willow plantation and poplar-willow plantation)with control(CK)were selected. Based on the wet sieving method, four indexes of stability, including>0.25 mm aggregate content(R0.25), mean weight diameter(MWD), geometric mean diameter(GMD)and fractal dimension(D), and organic carbon content of soil aggregates in 0—20 cm, 20—40 cm, and 40—60 cm soil layers were measured. The relationships between main varied indexes were analyzed using the Pearson method. [Results](1)The aggregates of each soil layer were mainly<0.25 mm microaggregates, which accounted for 50.33%～80.00% of the total. Three vegetation types had higher aggregate contents with size classes>2 mm and 0.25～2 mm than CK. The content of>2 mm macroaggregate in pure poplar plantation was the highest in each soil layers.(2)Compared with the control, R0.25,MWD and GMD of three vegetation types had their increased by 41.77%～91.28%, 29.89%～79.08% and 37.60%～94.32%, respectively. D of pure poplar plantation and pure willow plantation was significantly lower than that of the control(p<0.05).(3)The organic carbon content of aggregates in the experimental site soil layers ranged from 1.51 to 6.48 g/kg. Compared with the control, the organic carbon content of soil aggregates under the three vegetation types increased by 31.67%～71.68%, and the organic carbon content of aggregates in pure poplar plantation was significantly higher than that in pure willow plantation and poplar-willow plantation(p<0.05). Moreover, the highest value of organic carbon content of>2 mm aggregate in the 0—20 cm soil layers was found in pure poplar.(4)Linear regression analysis showed that the stability of soil aggregates was significantly correlated with organic carbon, especially with the content of large aggregates. In addition, fine root biomass, total nitrogen content, carbon to nitrogen ratio and water content were also important factors affecting the stability of soil aggregates. [Conclusion] Pure poplar plantation in riparian zone of plain sandy area is more conducive to improving soil aggregate stability and soil erosion resistance.
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备注/Memo
收稿日期:2022-11-21 修回日期:2023-01-17
资助项目:江苏省水利科技项目“江苏省平原沙土区生态河道水土保持效果评价及措施优化配置技术研究”(2020054)
第一作者:王磊(1998—),男,江苏宿迁人,硕士研究生,从事森林生态学研究。E-mail:315879908@qq.com
通信作者:关庆伟(1964—),男,辽宁沈阳人,教授,从事森林生态系统结构,功能与过程等方面的研究。E-mail:guanjapan999@163.com