广西甘蔗地不同耕作方式下土壤孔隙特征

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 27 期数: 2020年06期页码: 122-130 栏目: 目次出版日期: 2020-10-20

Title:: Soil Pore Characteristics of Sugarcane Field Under Different Tillage Treatments in Guangxi

文章编号:: 1005-3409(2020)06-0122-09

作者:: 甘磊^1,2, 李健³, 李帅³, 韦灵³, Saeed Rad^1,3; (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.桂林理工大学环境科学与工程学院, 广西桂林 541004)

Author(s):: GAN Lei^1,2, LI Jian³, LI Shuai³, WEI Ling³, Saeed Rad^1,3; (1.Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin, Guangxi 541004, China; 2.Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, Guangxi 541004, China; 3.College of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China)

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分类号:: S152.5

文献标志码:: A

摘要:: 为探究广西地区不同耕作方式对甘蔗地土壤孔隙结构的影响,选取经过3年耕作(CT)与免耕(NT)处理的两种不同耕作方式下的甘蔗地土壤作为研究对象,利用X射线CT扫描技术和ImageJ等软件获得表征土壤孔隙二维分布和三维特征的参数,并对土壤孔隙结构进行三维重构与可视化。结果表明:两种处理下土壤质地组成差异不大,但耕作使得土壤容重降低,改变了有机质的分布,使有机质含量显著增加。耕作主要影响土壤中的大孔隙(>50 μm)和中孔隙(0.2～50 μm)的分布,使得0—30 cm土层大孔隙减少,中孔隙增加。耕作处理土壤孔隙的面密度和复杂度的波动大于免耕处理。耕作处理的土壤孔隙连通度均值(0.687)显著高于免耕处理(0.465),孔隙弯曲度均值(1.314)显著低于免耕处理(1.348),孔隙度和孔隙数均值(0.526%,8 174)显著小于免耕处理(1.181%,16 306)。免耕土壤孔隙在三维空间中分布较多且均匀,但孔隙孤立,连通较少,并且孔隙路径较弯曲。耕作土壤孔隙在三维空间中分布虽少,但分布呈网络型,交叉连通孔隙较多,孔隙通道连续且规则。因此,在广西地区甘蔗种植中,相较免耕而言,耕作增加土壤中生物性大孔隙,增加孔隙的连通度,降低孔隙通道的弯曲度,有利于土壤水分与溶质运移通道形成,并且促进作物根系生长和微生物活动,改善土壤的导水透气性,对甘蔗的生长发育具有积极作用。

Abstract:: This study aimed to explore influence of different tillage treatments on soil pore structure in sugarcane fields in Guangxi region and provide reference for appropriate tillage to local sugarcane planting. In this study, sugarcane fields under tillage(CT)and non-tillage(NT)for 3 years in Guangxi were studied. Computed tomography with ImageJ software was applied to obtain the soil pore distribution features of the two-dimensional and three-dimensional space characteristics. The three-dimensional reconstruction and visualization of soil pore structure have been conducted. The results showed that there was a small difference in soil texture between the two treatments, but the content of soil organic matter in tillage plot increased and the bulk density decreased significantly; tillage mainly affected the number of macropores and medium pores in the soil, in which the number of macropores decreased and the number of medium pores increased; for the two-dimensional distribution, the density and complexity of pore cross-sectional area in tillage plot fluctuated more than that in non-tillage plot; as for the three-dimensional characteristics, the values of pore density(0.526%), pore number(8 174)and tortuosity(1.314)in tillage plot were less than those of values in non-tillage plot for 1.181%, 16 306, 1.348, respectively; however, the average connectivity values of pore in tillage plot(0.687)were greater than these values(0.465)in non-tillage plot; for the three-dimensional visualization figure, the distribution range of pores in non-tillage plot was larger, but relatively isolated, while the more network connectivity is demonstrated in the pores in tillage plot. On the other hand, since this study also has proved the method of CT scanning combined with three-dimensional reconstruction, hence the information of soil internal characteristics intuitively and comprehensively can be obtained. Compared with non-tillage in this study, tillage could reduce tortuosity but increase connectivity of the soil. Moreover, tillage could promote the formation of biological macropores that was located at the surface of the soil, which could facilitate infiltration of soil moisture. Thus, tillage is beneficial to crop root growth and microbial activity, and therefore improves the soil water and solute transport corridor, which lets tillage play a positive role in sugarcane growth.

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更新日期/Last Update: 2020-10-20