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花岗岩侵蚀劣地不同种植年限果园土壤团聚体的稳定性
林哲1, 黄智刚1,2, 邓羽松3, 黄婉霞3, 蒋代华1, 王玲4
1.广西大学 农学院, 广西 南宁 530004;2.中国农业科学院 农业环境与可持续发展研究所, 北京 100081;3.广西大学 林学院, 南宁 530004;4.华中农业大学 资源与环境学院, 湖北 武汉 430070
摘要:
[目的] 对花岗岩侵蚀劣地不同种植年限果园土壤团聚体稳定性进行研究,为南方花岗岩丘陵区侵蚀劣地的综合治理工作提供科学参考。[方法] 以桂东南花岗岩丘陵区柑橘园土壤为研究对象,运用Le Bissonnais (LB)法测定了侵蚀区不同种植年限(0,3,7,12,16,21 a)果园土壤团聚体组成及其稳定性,探究团聚体稳定性随种植年限的变化趋势及其影响因素。[结果] ①随着种植年限的延长,土壤通透性改善,阳离子交换量、有机碳含量提高,细颗粒物质含量上升,土壤质地由砂质土逐步向壤质土转化。②在LB法3种处理下,>0.25 mm粒径的团聚体质量百分数均随着种植年限的增加而增加,到21 a时均达到了65.68%以上,较对照(0 a)增加9.18%,土壤团聚度升高。③土壤团聚体平均重量直径(MWD)随着种植年限延长显著提高,且相对消散指数(RSI),机械破碎指数(RMI)及可蚀性因子K值均有不同程度的下降,表明团聚体稳定性得到提高。④团聚体MWD与土壤有机碳含量、黏粒含量为极显著正相关关系,与阳离子交换显著正相关,与砂粒含量极显著负相关,表明土壤中有机碳、黏粒以及阳离子交换量的提高均可以显著提高团聚体稳定性;有机碳含量是影响团聚体稳定性的主要影响因素。[结论] 削坡开梯开垦柑橘园可以有效治理侵蚀劣地,且随着开垦年限的增加,土壤的结构趋于稳定,团聚体稳定性提高,土壤质量改善。
关键词:  种植年限  团聚体稳定性  LeBissonnais法  通径分析
DOI:10.13961/j.cnki.stbctb.2021.04.010
分类号:S157
基金项目:国家重点研发计划项目“侵蚀退化红壤肥力提升与生态功能定向调控技术”(2017YFC0505402);广西科技重大专项“集约化农区面源污染综合防控体系与示范”(桂科AA17204078-4);国家自然科学基金重点项目(41630858)
Stability of Soil Aggregate in Orchards with Different Planting Years in Granite Eroded Poor Area
Lin Zhe1, Huang Zhigang1,2, Deng Yusong3, Huang Wanxia3, Jiang Daihua1, Wang Ling4
1.College of Agriculture, Guangxi University, Nanning, Guangxi 530004, China;2.Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;3.College of Forestry, Guangxi University, Nanning, Guangxi 530004, China;4.College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei 430070, China
Abstract:
[Objective] The stability of soil aggregate in orchard with different planting years in granite eroded poor land was studied to provide scientific reference for comprehensive management of eroded poor land in granite hilly area of South China. [Methods] The composition and stability of soil aggregate in orchards with different planting years (0, 3, 7, 12, 16, 21 years) in eroded area were determined by using Le bissonnais (LB) method in granite hilly area of Southeast Guangxi Zhuang Autonomous Region, and to explore the variation trend of soil aggregate stability with planting years and its influencing factors. [Results] ① With the increase of planting years, soil permeability was improved, cation exchange content, organic carbon content and fine particulate matter content increased, and the soil texture gradually transformed from sandy soil to loam soil. ② Under three different LB methods, the soil aggregate mass percentage of >0.25 mm size increased with the prolongation of planting years, reached more than 65.68% at 21 years, which was 9.18% higher than that of control. ③ The mean weight diameter (WMD) of soil aggregate increased significantly with the prolongation of the planting years. And the RSI, RMI, and k values all decreased to different degrees, meaning that the aggregate stability was improved. ④ The MWD was extremely significantly positively related to soil organic carbon content and clay content. Cation exchange content was significantly positively related to MWD, and sand content was extremely significantly negatively correlated. This showed that the increase of organic carbon, clay and cation exchange content could significantly improved the soil aggregate stability. The content of organic carbon was the main factor affecting the stability of aggregates. [Conclusion] Cutting slope to form citrus orchard can effectively control eroded poor land, and with the prolongation of reclamation years, the soil structure tends to be stable, and then the aggregate stability and the soil quality are improved.
Key words:  planting years  soil aggregate stability  Le Bissonnais  path analysis