本文選題：洪積扇 + 分形維數(shù)��； 參考：《水土保持學(xué)報(bào)》2016年05期

【摘要】：以廣東省五華縣典型崩崗洪積扇為研究對(duì)象,通過GPS RTK獲取從扇頂?shù)缴染?4個(gè)采樣點(diǎn)的坐標(biāo)、高程信息,并采集土壤樣品進(jìn)行理化性質(zhì)的測(cè)定及分析,通過分形理論、回歸分析和地統(tǒng)計(jì)學(xué)相結(jié)合的方法研究洪積扇土壤分形特征和空間變異規(guī)律,以及分形維數(shù)與土壤顆粒組成和養(yǎng)分含量的相關(guān)關(guān)系。結(jié)果表明:土壤顆粒組成和養(yǎng)分含量具有明顯的空間分異特征,且與分形維數(shù)的空間分布呈現(xiàn)出一定的規(guī)律性。從扇頂?shù)缴染?土壤粉粒、粘粒質(zhì)量分?jǐn)?shù)和養(yǎng)分含量逐漸增加,與分形維數(shù)呈顯著正相關(guān)線性關(guān)系,砂粒質(zhì)量分?jǐn)?shù)則逐漸減少,與分形維數(shù)呈顯著負(fù)相關(guān)線性關(guān)系,其中洪積扇土壤粘粒含量對(duì)土壤顆粒分形特征影響最大,相關(guān)系數(shù)達(dá)到0.969。研究結(jié)果表明,土壤分形維數(shù)是能反映土壤質(zhì)地差異以及土壤肥力狀況的一項(xiàng)綜合性定量指標(biāo)。
[Abstract]:Taking the typical avalanche flood fan in Wuhua County, Guangdong Province as the research object, the coordinates and elevation information of 64 sampling points from the top of the fan to the edge of the fan were obtained by GPS RTK, and the physical and chemical properties of soil samples were measured and analyzed through fractal theory. The fractal characteristics and spatial variation of alluvial fan soil were studied by means of regression analysis and geostatistics, and the correlation between fractal dimension and soil particle composition and nutrient content was also studied. The results showed that the soil particle composition and nutrient content had obvious spatial differentiation characteristics, and the spatial distribution with fractal dimension showed a certain regularity. From the fan top to the fan edge, the soil silt, clay mass fraction and nutrient content increased gradually, showing a significant positive correlation with fractal dimension, sand mass fraction gradually decreased, and significantly negative linear relationship with fractal dimension. Among them, the clay content of alluvial fan soil has the greatest influence on the fractal characteristics of soil particles, and the correlation coefficient is 0.969. The results show that the fractal dimension of soil is a comprehensive quantitative index which can reflect the difference of soil texture and soil fertility.
【作者單位】： 華中農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金“花崗巖紅壤優(yōu)先流及其與崩崗侵蝕發(fā)育的關(guān)系”(41571258)
【分類號(hào)】：S158;S152

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