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首页> 外文期刊>Journal of food, agriculture & environment >Characteristics and aggregate stability of soil particle size distribution under four forestland types in low mountains and hills of Southwest China
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Characteristics and aggregate stability of soil particle size distribution under four forestland types in low mountains and hills of Southwest China

机译：中国西南低山区林地类型土壤粒度分布的特征及综合稳定性

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摘要

Soil erosion is a great threat to ecological security and economic development, as observed in the low mountains and hills of Southwest China. The effect of soil structure on soil erosion is significant, and a close relationship exists among soil texture, micro aggregates, macro aggregates, and soil erosion. The particle size distribution and aggregate stability of soil in low mountains and hills of Southwest China must be studied to prevent soil erosion. The current work focuses on forestlands in low mountains and hills of Southwest China. A total of 12 forestland plots in Simian Mountain, Chongqing, were selected in 2010 for the study. These plots were classified into four types, namely, Quercus aliena, Lithocarpus fangii, Cryptomeria fortunei, and Phyllostachys heterocycla cv. pubescens, and each type had three replications. The measurements of soil particle group parameters showed that soil particles in P. heterocycla cv. pubescens forestland had the lowest dispersity, relatively high skewness,and the highest kurtosis, compared with the other three forestland types. The lowest and highest fractal dimensions of soil micro aggregates were in 40 to 60 cm of the soil in Lfangii forestland and in the topsoil (0 -20 cm) of the C. fortunei forestland, respectively. The fractal dimension of micro aggregates was positively correlated with the percentage of micro aggregates <0.001 mm in size (D = 0.0609X_5+2.2711 (n = 36, R = 0.869)) and negatively correlated with the percentage of the micro aggregates 0.05-0.25 mm in size (D = -0.0072X+2.8824 (n = 36, R = 0.762)). Except for Q. aliena, the highest conservation probability of soil aggregate in the three other forest plots was observed in the aggregates 1-3 mm in size (L. fangii was 0.59, C. fortune 0.53 and P. heterocycla cv. pubescens 0.46). The aggregate stability indices in the two broad-leaved forests (Q. aliena and L fangii) were higher than those of the two other forests (3.70 and 3.18 in the topsoil (0 -20 cm), 2.90 and 2.99 in 20-40 cm of the soil, and 2.94 and 3.10 in 40-60 cm of the soil). Effects of the size distribution characteristics and aggregate stability of soil on soil erosion were observed in all four forest plots, with the most significant effect observed in the two broad-leavedforests. Therefore, broad-leaved forests should be prioritized in the afforestation campaign in the study area.
机译：在中国西南部的低山和山丘中观察到，土壤侵蚀是生态安全和经济发展的巨大威胁。土壤结构对土壤侵蚀的影响是显着的，土壤纹理，微聚集体，宏观聚集体和土壤侵蚀存在密切关系。必须研究低山区土壤粒度分布和综合稳定性，以防止土壤侵蚀。目前的工作侧重于中国西南低山和山丘的林地。在2010年，在2010年选择了重庆猿猴山区的12个森林地块。将这些地块分为四种类型，即栎，栎属aliena，lithocarpus fangii，cryptomeria fortunei和phyllostachys杂环cv。 pubescens，每种类型都有三种复制。土壤颗粒组参数的测量显示P.杂环中的土壤颗粒。与其他三种林地类型相比，Pubescens Forestland的分散性最低，偏差相对较高，抗尿精最高。土壤微生物的最低和最高分形尺寸分别在Lfangii林地的土壤中40至60厘米，分别在C. Fortunei林地的Tootsoil（0 -20厘米）。微聚集体的分形尺寸与尺寸的微聚集体<0.001mm的百分比呈正相关（d = 0.0609x_5 + 2.2711（n = 36，r = 0.869）），与0.05-0.25的微聚集体的百分比负相关尺寸（d = -0.0072x + 2.8824（n = 36，r = 0.762）））。除了Q.Aliena外，在1-3mm的聚集体中观察到三个其他森林图中的土壤骨料的最高保守概率（L.Fangii为0.59，C. fortune 0.53和P.杂环CV。Pubescens 0.46） 。两个阔叶林（Q.Aliena和L Fangii）的总稳定性指标高于另外两个森林（3.70和3.18的表土（0-20厘米），2.90和2.99，在20-40厘米中土壤中的土壤和2.94和3.10在40-60厘米的土壤中）。在所有四种森林地块中观察到土壤尺寸分布特征和土壤聚集稳定性的影响，两种宽阔的林业中观察到的最显着效果。因此，阔叶林应在研究区的造林运动中优先考虑。

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