【摘要】：對龐泉溝流域不同海拔人工油松(Pinus tabulaeformis)林、天然油松林、人工華北落葉松(Larix principis-rupprechtii)林、天然華北落葉松林、油松-遼東櫟(Quercus wutaishansea)混交林、山楊(Populus davidiana)林、白樺(Betula platyphylla)林、云杉(Picea asperata)-華北落葉松混交林等林種10個典型林分共39份土壤樣品的質(zhì)地、分形維數(shù)以及土壤養(yǎng)分進行了研究。結(jié)果表明:研究區(qū)的土壤質(zhì)地主要砂質(zhì)壤土、粉砂壤土、壤質(zhì)砂土及砂土,其比例分別為46.15%、25.64%、23.08%、5.13%。流域內(nèi)砂粒、粉粒和黏粒含量平均值分別為62.34%、36.58%、1.08%,粉粒和黏粒變異程度高于砂粒。分形維數(shù)介于1.773 3~2.778 9,均值為2.509 0,標準差為0.192 5,土壤質(zhì)地越粗,土壤粒徑分形維數(shù)越小。土壤粒徑分形維數(shù)與土壤砂粒含量呈極顯著負相關(guān)關(guān)系(P0.01),與粉粒含量和黏粒含量均呈極顯著正相關(guān)關(guān)系(P0.01)。流域內(nèi)不同林分土壤pH值在6.25~8.09,天然林土壤表層有機質(zhì)、全氮、速效鉀含量顯著高于人工林,堿解氮含量人工林顯著高于天然林,所有林分土壤表層均缺乏有效磷。土壤粒徑分形維數(shù)與pH呈極顯著正相關(guān)關(guān)系(P0.01),與有機質(zhì)呈極顯著負相關(guān)關(guān)系(P0.01),與全氮、堿解氮、速效鉀呈顯著負相關(guān)關(guān)系(P0.05),與有效磷相關(guān)性不顯著。分形維數(shù)越大,土壤pH越大,土壤肥力越小。因此,土壤粒徑分形維數(shù)可以作為判斷龐泉溝流域土壤質(zhì)地差異與土壤養(yǎng)分差異的重要指標。
[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.
【作者單位】： 山西省林業(yè)科學研究院;
【基金】：山西省重點研發(fā)計劃項目(201603D321004)
【分類號】：S714

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