高级检索
    王珊珊, 毕华兴, 崔艳红, 云慧雅, 马晓至, 赵丹阳, 侯贵荣. 晋西黄土区不同密度刺槐林土壤抗蚀性关键指标及特征研究[J]. 北京林业大学学报, 2022, 44(5): 94-104. DOI: 10.12171/j.1000-1522.20200226
    引用本文: 王珊珊, 毕华兴, 崔艳红, 云慧雅, 马晓至, 赵丹阳, 侯贵荣. 晋西黄土区不同密度刺槐林土壤抗蚀性关键指标及特征研究[J]. 北京林业大学学报, 2022, 44(5): 94-104. DOI: 10.12171/j.1000-1522.20200226
    Wang Shanshan, Bi Huaxing, Cui Yanhong, Yun Huiya, Ma Xiaozhi, Zhao Danyang, Hou Guirong. Key indexes and characteristics of soil anti-erodibility of Robinia pseudoacacia with different densities in loess region of western Shanxi Province, northern China[J]. Journal of Beijing Forestry University, 2022, 44(5): 94-104. DOI: 10.12171/j.1000-1522.20200226
    Citation: Wang Shanshan, Bi Huaxing, Cui Yanhong, Yun Huiya, Ma Xiaozhi, Zhao Danyang, Hou Guirong. Key indexes and characteristics of soil anti-erodibility of Robinia pseudoacacia with different densities in loess region of western Shanxi Province, northern China[J]. Journal of Beijing Forestry University, 2022, 44(5): 94-104. DOI: 10.12171/j.1000-1522.20200226

    晋西黄土区不同密度刺槐林土壤抗蚀性关键指标及特征研究

    Key indexes and characteristics of soil anti-erodibility of Robinia pseudoacacia with different densities in loess region of western Shanxi Province, northern China

    • 摘要:
        目的  研究晋西黄土区16年生刺槐林土壤抗蚀性的关键评价指标,探讨林分密度对土壤抗蚀性的影响,为实现功能导向型林分结构定向调控提供参考依据。
        方法  以5个密度梯度(1 025、1 300、1 575、1 800、2 150 株/hm2)刺槐林为研究对象,基于野外采样和室内试验,选取5大类、12个土壤抗蚀性指标进行单独分析与综合评价。
        结果  (1)应用主成分分析对12个土壤抗蚀性指标进行筛选,可知土壤密度(因子载荷量为−0.776)、有机质含量(0.864)、 > 0.25 mm水稳性团聚体质量分数(0.747)、平均质量直径(0.960)、几何平均直径(0.779)、土壤分形维数(−0.736)和分散系数(−0.873)是评价晋西黄土区刺槐林(16年生)土壤抗蚀性强弱的关键指标;(2)同一林分密度下,刺槐林表层土壤抗蚀性优于深层土壤,土壤抗蚀性综合指数为0 ~ 10 cm(0.548) > 10 ~ 20 cm(−0.070) > 20 ~ 30 cm(−0.477);同一土层内,刺槐林土壤抗蚀性随林分密度的增大(1 025 ~ 1 575 株/hm2)逐渐增强,在密度大于1 575 株/hm2后逐渐减弱;(3)以刺槐林分密度为x轴,以土壤抗蚀性综合指数为y轴建立了开口向下的抛物线函数关系:y = −2.683 × 10−6x2 + 0.009x − 6.375(R2 = 0.77),据此预测刺槐林分密度为1 590 株/hm2时,土壤抗蚀性最强,综合指数为0.403。
        结论  研究区中密度刺槐林分的土壤抗蚀性较强,从土壤抗蚀性角度,建议刺槐林(16年生)的经营密度以1 590 株/hm2为宜,对于密度过低或过高的林分,在满足林业生产的同时及时进行科学补植或间伐,还应注意保护表层土壤,以充分发挥林地的水土保持功能,有效控制土壤侵蚀。

       

      Abstract:
        Objective  This paper aims to study the key evaluation indexes of soil anti-erodibility of Robinia pseudoacacia forest (16 years), and discuss the effects of stand density on soil anti-erodibility in the loess region of western Shanxi Province of northern China, which could provide functional guidance for the precise improvement of stand structure.
        Method  The research objects were five density gradients (1 025, 1 300, 1 575, 1 800, 2 150 tree/ha) of R. pseudoacacia forest. Based on field sampling and laboratory tests, 12 indexes about soil anti-erodibility had been analyzed.
        Result  (1) Principal component analysis showed that the soil bulk density, organic matter, > 0.25 mm water-stable aggregate, mean mass diameter, geometric mean diameter, fractal dimension and soil dispersion coefficient were key indexes to evaluate soil anti-erodibility of R. pseudoacacia forest, these factor loads were −0.776, 0.864, 0.747, 0.960, 0.779, −0.736 and −0.873, respectively. (2) Anti-erodibility of surface soil of R. pseudoacacia forest was stronger than that of deep soil under the same stand density, the comprehensive index of soil anti-erodibility: 0−10 cm (0.548) > 10−20 cm (−0.070) > 20−30 cm (−0.477). In the same soil layer, soil anti-erodibility increased with the increase of stand density (1 025−1 575 tree/ha) of R. pseudoacacia forest, and decreased when the stand density was higher than 1 575 tree/ha. (3) Taking the stand density of R. pseudoacacia forest as the x-axis and the comprehensive index of soil anti-erodibility as the y-axis, the parabolic function relationship with opening downward was established: y = −2.683 × 10−6x2 + 0.009x − 6.375 (R2 = 0.77), soil anti-erodibility was the strongest when the stand density of R. pseudoacacia was 1 590 tree/ha, and the comprehensive index was 0.403.
        Conclusion  Soil anti-erodibility of medium density R. pseudoacacia forest is strong. From the perspective of soil anti-erodibility, the management density of R. pseudoacacia forest (16 years) should be 1 590 tree/ha in the loess region of western Shanxi Province. For the stand with too low or too high density, scientific replanting or thinning should be carried out in time while meeting the forestry production. Attention should also be paid to the protection of topsoil, so as to give full play to the water and soil conservation function of forest land and effectively control soil erosion.

       

    /

    返回文章
    返回