不同土地利用方式对山东滨海盐碱土理化性质的影响
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S153

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山东省科技创新重大专项(2019JZZY010716),泰山领军人才工程项目(LJNY202017)和山东省重点研发计划(2017CXGC0306)资助


Effects of Different Land-use Types on Physical and Chemical Properties of Coastal Saline-alkali Soils in Shandong Province
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the Major Science and Technology Innovation Project of Shandong Province (No.2019JZZY010716), the Taishan Leading Talents Project (No. LJNY202017) and the Key Research and Development Program of Shandong Province (No. 2017CXGC0306)

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    摘要:

    山东滨海盐碱土壤盐分高、养分低、结构差等问题严重影响了该地区的农业发展,因此有效开发和利用该地区土地对其农业增产增收至关重要。以东营市垦利县四种土地利用方式(荒地、草地、耕地、林地)为研究对象,探讨不同土地利用方式对滨海盐碱土基本理化性质、团聚体稳定性的影响。结果表明:(1)土壤的电导率(EC)和水溶性K+、Na+含量均表现为荒地>耕地>草地>林地,且荒地的EC和Na+含量显著高于其他样地;(2)土壤的全氮(N)和总有机碳含量(SOC)表现为林地>草地>耕地>荒地,各土壤0.25~2 mm粒级的水稳性团聚体的SOC最高;(3)林地的机械稳定性平均质量直径(MWD)和>0.25 mm的机械稳定性团聚体含量(R0.25)显著低于其他样地;(4)荒地的水稳性平均质量直径(WMWD)和>0.25 mm的水稳性团聚体含量(WR0.25)显著低于其他样地;(5)团聚体破坏率(PAD)依次表现为荒地>耕地>草地>林地。扫描电镜(SEM)结果显示草地、耕地和林地中>2 mm水稳性团聚体的表面和内部有较明显的颗粒、孔隙及黏结物质。Pearson相关分析表明,机械组成与MWD、R0.25存在显著相关性;PAD与水溶性Na+含量、0.25~2 mm组分水稳性团聚体SOC存在极显著相关性。不同土地利用方式对土壤的物理、化学和力学性质有不同的影响。草地和林地土地利用方式对滨海盐碱土壤理化性质的改良效果均显著,林地具有更高的碳储量及团聚体水稳性,但机械稳定性较低。研究结果可为滨海盐碱地区土地利用的合理规划与可持续发展提供参考。

    Abstract:

    [Objective] The problems of high salinity, low nutrient and poor soil structure in the coastal saline-alkali area of Shandong province seriously affect the development of agricultural production. Therefore, the effective development and utilization of the soils in this region are of great importance to its agricultural production and income.[Method] In this study, the four land-use types (wasteland, grassland, cultivated land and forest land) in Kenli County of Dongying City were taken as the research objects, and the effects of different land-use types on the basic physical and chemical properties and aggregate stability of coastal saline-alkali soils were evaluated.[Result] The results showed that (i) the electrical conductivity (EC) and water-soluble K+ and Na+ contents in wasteland > cultivated land > grassland > forest land, with EC and Na+ content of wasteland being significantly higher than those from other sampling plots; (ii) the total nitrogen (N) and total organic carbon content (SOC) of the soils in forest land > grassland > cultivated land > wasteland, with SOC in the 0.25~2 mm water-stable aggregates being the highest; (iii) the mechanical stability mean weight diameter (MWD) and the mechanical stability aggregate content of > 0.25 mm particle diameter (R0.25) were significantly lower in forest land than those of other sampling plots; (iv) the water stability mean weight diameter (WMWD) and the water stability aggregate content of > 0.25 mm particle size (WR0.25) in wasteland were significantly lower than those in other sampling plots; and (v) the percentage of aggregate destruction (PAD) in wasteland > cultivated land > grassland > forest land. Additionally, results of the surface and internal scanning electron microscopy (SEM) of the 2 mm water-stable aggregates in grassland, cultivated land and forest land showed relatively obvious particles, pores, and adhesive materials. Furthermore, the Pearson correlation analysis showed that mechanical composition was significantly correlated with MWD and R0.25 while PAD was significantly correlated with soil water soluble Na+ content and SOC of 0.25~2 mm water-stable aggregate soil.[Conclusion] Different land-use types have different effects on soil physical, chemical, and mechanical properties. The grassland and forest land use types have significant ameliorating effects on the physical and chemical properties of coastal saline soil while forest land use has higher carbon reserves and aggregate water stability, but lower mechanical stability. The results of this study can provide references for the rational planning and sustainable development of land use in the coastal saline-alkali area.

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李珊,杨越超,姚媛媛,刘燕,张淑刚,张衍鹏.不同土地利用方式对山东滨海盐碱土理化性质的影响[J].土壤学报,2022,59(4):1012-1024. DOI:10.11766/trxb202008310491 LI Shan, YANG Yuechao, YAO Yuanyuan, LIU Yan, ZHANG Shugang, ZHANG Yanpeng. Effects of Different Land-use Types on Physical and Chemical Properties of Coastal Saline-alkali Soils in Shandong Province[J]. Acta Pedologica Sinica,2022,59(4):1012-1024.

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