庞泉沟流域土壤粒径分形维数特征

发布时间：2019-02-18 15:02

【摘要】：对庞泉沟流域不同海拔人工油松(Pinus tabulaeformis)林、天然油松林、人工华北落叶松(Larix principis-rupprechtii)林、天然华北落叶松林、油松-辽东栎(Quercus wutaishansea)混交林、山杨(Populus davidiana)林、白桦(Betula platyphylla)林、云杉(Picea asperata)-华北落叶松混交林等林种10个典型林分共39份土壤样品的质地、分形维数以及土壤养分进行了研究。结果表明:研究区的土壤质地主要砂质壤土、粉砂壤土、壤质砂土及砂土,其比例分别为46.15%、25.64%、23.08%、5.13%。流域内砂粒、粉粒和黏粒含量平均值分别为62.34%、36.58%、1.08%,粉粒和黏粒变异程度高于砂粒。分形维数介于1.773 3~2.778 9,均值为2.509 0,标准差为0.192 5,土壤质地越粗,土壤粒径分形维数越小。土壤粒径分形维数与土壤砂粒含量呈极显著负相关关系(P0.01),与粉粒含量和黏粒含量均呈极显著正相关关系(P0.01)。流域内不同林分土壤pH值在6.25~8.09,天然林土壤表层有机质、全氮、速效钾含量显著高于人工林,碱解氮含量人工林显著高于天然林,所有林分土壤表层均缺乏有效磷。土壤粒径分形维数与pH呈极显著正相关关系(P0.01),与有机质呈极显著负相关关系(P0.01),与全氮、碱解氮、速效钾呈显著负相关关系(P0.05),与有效磷相关性不显著。分形维数越大,土壤pH越大,土壤肥力越小。因此,土壤粒径分形维数可以作为判断庞泉沟流域土壤质地差异与土壤养分差异的重要指标。
[Abstract]:The (Pinus tabulaeformis) forest, natural Pinus tabulaeformis forest, artificial larch forest (Larix principis-rupprechtii), natural larch forest, (Quercus wutaishansea) mixed forest of Pinus tabulaeformis and Quercus liaotungensis, and (Populus davidiana) forest of Populus tabulaeformis were studied. The texture, fractal dimension and soil nutrient of soil samples from 10 typical stands of Bai Hua (Betula platyphylla) forest, Picea spruce (Picea asperata)-Larch mixed forest were studied. The results showed that the main sandy loam, silty loam, loamy sandy soil and sandy soil were mainly sandy loam, and the proportion of sandy loam and sandy soil in the study area were 46.150.64 and 23.085.13, respectively. The results showed that the soil texture of the study area was mainly sandy loam, silty loam, loam sandy soil and sandy soil. The average content of sand, silt and clay in the basin is 62.34%, 36.58% and 1.08, respectively. The variation degree of silt and clay is higher than that of sand. The fractal dimension ranged from 1.773 to 2.778.9, with a mean value of 2.509 0 and a standard deviation of 0.192 5. The thicker the soil texture, the smaller the fractal dimension of soil particle size. The fractal dimension of soil particle size was negatively correlated with soil sand content (P0.01), and positively correlated with silt content and clay content (P0.01). The soil pH value of different stands in the basin was 6.25 ~ 8.09. The contents of organic matter, total nitrogen and available potassium in surface layer of natural forest were significantly higher than those in artificial forest, and the content of alkali-hydrolyzed nitrogen in artificial forest was significantly higher than that in natural forest, and the soil surface layer of all stands was short of available phosphorus. The fractal dimension of soil particle size was significantly positively correlated with pH (P0.01), negatively correlated with organic matter (P0.01), negatively correlated with total nitrogen, alkali-hydrolyzed nitrogen and available potassium (P0.05). There was no significant correlation with available phosphorus. The larger the fractal dimension, the larger the soil pH and the smaller the soil fertility. Therefore, the fractal dimension of soil particle size can be used as an important index to judge the difference of soil texture and soil nutrients in Pang Quanggou watershed.
【作者单位】：山西省林业科学研究院;
【基金】：山西省重点研发计划项目(201603D321004)
【分类号】：S714

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