不同粉垄深度对甘蔗地土壤孔隙结构的影响  

Effects of different depths of Fenlong tillage on the soil pore structure in sugarcane field

作　　者：盛勇创 王释苇 张硕 王健豪 常成 张红霞 黄金生[3] 甘磊[1,2] SHENG Yong-chuang;WANG Shi-wei;ZHANG Shuo;WANG Jian-hao;CHANG Cheng;ZHANG Hong-xia;HUANG Jin-sheng;GAN Lei(Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area/Guilin University of Technology,Guilin Guangxi 541004;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology/Guilin University of Technology,Guilin Guangxi 541004;Agricultural Resource and Environment Research Institute,Guangxi Academy of Agricultural Sciences,Nanning Guangxi 530007)

机构地区：[1]桂林理工大学/广西岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004 [2]桂林理工大学/广西环境污染控制理论与技术重点实验室,广西桂林541004 [3]广西农业科学院农业资源与环境研究所,广西南宁530007

出　　处：《中国土壤与肥料》2023年第9期12-19,共8页Soil and Fertilizer Sciences in China

基　　金：国家自然科学基金项目(42067002);广西科技重大专项(桂科AA20302020-2)。

摘　　要：为揭示不同粉垄深度对甘蔗地土壤孔隙结构的影响,基于广西甘蔗地不同粉垄深度耕作试验,利用CT扫描成像技术和Image J获取粉垄浅耕(F20,耕作深度20 cm)与粉垄深耕(F40,耕作深度40 cm)两个处理甘蔗土0~40 cm土层土壤孔隙结构。结果表明:与F20处理相比,F40处理显著增加了土壤不同孔径级别的二维和三维孔隙数量。在甘蔗根系主要生长区的0~20 cm土层内,F40处理显著提高了土壤的孔隙面密度,并显著降低了土壤的孔隙复杂度。同时在0~40 cm土层内F40处理的土壤孔隙度、分支长度密度和连通性分别显著高于F20处理74.13%、151.39%和51.21%。土壤孔隙三维空间分布显示,F40处理的点状孔隙数量在0~20 cm土层明显多于F20处理,且孔隙分布更密集,这也反映出F40处理的土壤具有更大的连通可能性。而在20~40 cm土层,F40处理的点状孔隙与长条形孔隙在数量上较F20处理均无明显差异,但F40处理的长条形孔隙向四周呈散射状分布,较F20处理长条形孔隙竖直分布可能更有利于增强土壤储水能力及植物根系对养分的吸收。研究表明,粉垄深耕可有效增加广西甘蔗地的土壤不同孔径级别的孔隙数量,且使上层土壤孔隙排列紧密、孔隙边界的不规则性降低,同时提高土壤的孔隙度、孔隙分支长度密度,从而提高土壤的孔隙连通性,对土壤孔隙结构的改善有一定积极影响,为广西甘蔗实现土壤良性发展提供了理论依据和技术参考。To reveal the effect of different depths of Fenlong tillage on the soil pore structure in sugarcane field,CT(computerized tomography)scanning imaging technology and Image J software were used to obtain the soil pore structure of the 0-40 cm soil layer in sugarcane field for two treatments:Fenlong shallow tillage(F20,tillage depth 20 cm)and Fenlong deep tillage(F40,tillage depth 40 cm)in this study.The number of two-dimensional pores and three-dimensional pores in the different pore size classes of the soil under the F40 treatment was significantly more than that of F20.Within the 0-20 cm soil layer,which is the main growth area of the sugarcane root system,the soil pore surfaced density of F40 was significantly higher than that of F20,while the soil pore complexity of F40 was significantly less than that of F20.Within the 0-40 cm soil layer,the soil porosity,branch length density and connectivity of the F40 treatment were significantly higher than those of the F20 treatment by 74.13%,151.39%and 51.21%,respectively.The three-dimensional spatial distribution of soil pores showed that the number of punctate pores under the F40 treatment was significantly more than that of F20 within the 0-20 cm soil layer,and there were more connections between the pores in the former.While there was no significant difference in the number of punctate pores and the number of long strip pores under the F40 treatment compared with that of F20 within the 20-40 cm soil layer.However,compared to the vertical distribution of the long strip pores under the F20 treatment,the emission-like distribution scattered in all directions of the long strip pores under the F40 treatment was more beneficial to enhance the soil water storage capacity and enhance the nutrient uptake by plant roots.The study showed that Fenlong deep tillage can effectively increase the number of pores of different pore size levels in Guangxi sugarcane land,furthermore make the upper soil pores closely arranged and the irregularity of pore boundaries reduced.The consequenc

关 键 词：粉垄深度 孔隙结构 甘蔗 CT扫描 

分 类 号：S152[农业科学—土壤学] S566.1[农业科学—农业基础科学]