Quantifying the structural characteristics and hydraulic properties of shallow Entisol in a hilly landscape

IF 2 4区农林科学 Q2 AGRONOMY

International Agrophysics Pub Date : 2022-05-04 DOI:10.31545/intagr/148029

Cuiting Dai, Yaojun Liu, Tianwei Wang, Zhaoxia Li, Yiwen Zhou, J. Deng

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引用次数: 0

Abstract

. Entisols are widely distributed in the hilly areas of southern China. They are affected by serious soil erosion and extensive agricultural activities, the structural and hydraulic properties of particular Entisols may differ. Characterizing soil structure and hydraulic properties is important with regard to the development of an understanding of the hydrology and ecosystem functions of shallow Entisols. X-ray computed tomography was used to characterize and quantify the soil pore structure under four typical land use types (cropland, grassland, tea orchard and forest land) from a hilly landscape in South China and the hydraulic properties of the soil including its saturated hydraulic conductivity and water retention curve were measured. The results showed that the soils under the grassland retained 14 and 21% more water at saturation than those under the cropland and tea orchard, respec-tively. The Entisol in the forest land had a significantly larger macroporosity (0.214 mm 3 mm –3 ) compared with that in the cropland (0.117 mm 3 mm –3 ) and tea orchard (0.131 mm 3 mm –3 ). The contribution of pores with a diameter >4 mm as compared to the total computed tomography derived porosity was 62.4% in the forest land, while this size class contributed 69 and 47.3% to the total porosity in the tea orchard and grassland, respectively. The saturated hydraulic conductivity value was well correlated with the degree of anisotropy and the fractal dimension.

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定量分析丘陵景观中浅层土壤的结构特征和水力特性

Entisol广泛分布于中国南方丘陵地区。它们受到严重的土壤侵蚀和广泛的农业活动的影响，特定Entisol的结构和水力特性可能不同。表征土壤结构和水力特性对于理解浅层土壤的水文和生态系统功能非常重要。利用X射线计算机断层扫描技术对我国南方丘陵区四种典型土地利用类型（农田、草地、茶园和林地）下的土壤孔隙结构进行了表征和量化，并测量了土壤的水力特性，包括饱和导水率和保水曲线。结果表明，草地土壤饱和保水率分别比农田和茶园高14%和21%。与农田（0.117 mm 3 mm–3）和茶园（0.131 mm 3 mm-3）相比，林地中的Entisol具有更大的大孔隙（0.214 mm 3 mm-3）。与计算机断层扫描得出的总孔隙度相比，直径>4mm的孔隙在林地中的贡献率为62.4%，而这一尺寸类别在茶园和草地中分别占总孔隙度的69%和47.3%。饱和导水率值与各向异性程度和分形维数有很好的相关性。

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来源期刊

International Agrophysics 农林科学-农艺学

CiteScore

3.60

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： The journal is focused on the soil-plant-atmosphere system. The journal publishes original research and review papers on any subject regarding soil, plant and atmosphere and the interface in between. Manuscripts on postharvest processing and quality of crops are also welcomed. Particularly the journal is focused on the following areas: implications of agricultural land use, soil management and climate change on production of biomass and renewable energy, soil structure, cycling of carbon, water, heat and nutrients, biota, greenhouse gases and environment, soil-plant-atmosphere continuum and ways of its regulation to increase efficiency of water, energy and chemicals in agriculture, postharvest management and processing of agricultural and horticultural products in relation to food quality and safety, mathematical modeling of physical processes affecting environment quality, plant production and postharvest processing, advances in sensors and communication devices to measure and collect information about physical conditions in agricultural and natural environments. Papers accepted in the International Agrophysics should reveal substantial novelty and include thoughtful physical, biological and chemical interpretation and accurate description of the methods used. All manuscripts are initially checked on topic suitability and linguistic quality.