黄土高原丘陵沟壑区土地利用方式对土壤团聚体特征的影响

发布时间：2018-03-26 20:42

本文选题：黄土高原　切入点：土壤团聚体　出处：《水土保持学报》2017年01期

【摘要】：为研究黄土高原丘陵沟壑区复垦土地在不同利用方式下对土壤团聚体的影响,以陕西延安南泥湾沟壑区退化耕地整治复垦后,5种不同的土地利用方式,分别为林地(F处理),水稻(R处理),玉米(M处理)、蔬菜(V处理)及荒地(CK处理)。测定分析干筛法和湿筛法0—40cm土层土壤0.25mm团聚体分布、平均重量直径(MWD)、几何平均直径(GMD)、团聚体破坏率(PAD)和分形维数(D)。结果表明:(1)各处理在0—40cm各土层土壤团聚体数量及大小均显著优于CK处理,各处理干筛下0—40cm土层0.25mm团聚体含量(DR0.25)和湿筛下该团聚体含量(WR0.25)随着土壤土层深度的增加呈现相反的趋势;(2)干筛法和湿筛法0—40cm土层各处理土壤平均重量直径(MWD)和几何平均直径(GMD)的平均值大小顺序均呈现F处理R处理M处理V处理CK处理,F处理和R处理对增加土壤团聚体较其它处理效果显著;(3)湿筛法分析表明,各处理土壤团聚体破坏率(PAD)在0—40cm土层内均表现出近似"Z"字形趋势,各处理显著低于CK;(4)各处理的分形维数(D)在0—40cm土层平均值大小顺序为F处理R处理M处理V处理CK处理。土壤分形维数(D)与干筛法和湿筛法下0—40cm土层0.25mm团聚体含量之间存在良好的线性关系,分别为R2=0.73和R2=0.80。林地和水稻田利用方式可有效提高土壤团聚体数量和质量,增加土壤稳定性和改善土壤结构。
[Abstract]:In order to study the effect of reclaimed land on soil aggregates in hilly and gully areas of Loess Plateau, five different land use patterns were studied after reclamation of degraded farmland in Nan-an Bay Gully region of Yan'an, Shaanxi Province. The distribution of 0.25mm aggregates in 0-40cm soil layer was determined by dry sieve method and wet sieve method, respectively. The results showed that the average weight diameters (0-40cm), geometric mean diameters (GMD), aggregate failure rate (PAD) and fractal dimension (D) were significantly higher in 0-40cm than in CK treatments. The content of 0.25mm aggregates in 0-40cm soil layer under dry sieve and wet sieve soil layer showed a reverse trend with the increase of soil depth.) dry sieve method and wet sieve method for 0-40cm soil layer, the average weight diameters of each treated 0-40cm soil layer were different from those of dry sieve soil layer and wet sieve soil layer. The order of mean values of GMDs showed that F treatment, R treatment, M treatment, CK treatment, F treatment, and R treatment had significant effects on increasing soil aggregate compared with other treatments. The failure rate of soil aggregates and PAD) in each treatment showed a similar "Z" zigzag trend in the 0-40cm soil layer. The order of average value of 0-40cm soil layer is F treatment R treatment M treatment V treatment CK treatment. Soil fractal dimension D0) and dry sieve method and wet sieve method 0.25mm aggregate content in 0-40cm soil layer under the order of F treatment R treatment M treatment CK treatment D4) the fractal dimension of each treatment is significantly lower than that of CK treatment D4) in the order of average value of 0-40cm soil layer is F treatment R treatment M treatment CK treatment. There is a good linear relationship between them, The utilization patterns of forest land and paddy field can effectively improve the quantity and quality of soil aggregates, increase soil stability and improve soil structure.
【作者单位】：陕西省土地工程建设集团有限责任公司;西北农林科技大学林学院;
【基金】：国家科技支撑计划项目(2014BAL01B03)
【分类号】：S152.3

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