本文關(guān)鍵詞：廣東省土壤Cd含量空間分布預(yù)測(cè)?　出處：《環(huán)境科學(xué)》2017年05期 　論文類型：期刊論文

  更多相關(guān)文章： 空間分布 土壤Cd含量 廣東 Cubist 驅(qū)動(dòng)因子

【摘要】：土壤重金屬的空間格局對(duì)土壤重金屬污染防治具有重要的指導(dǎo)意義.本文以廣東省土壤Cd含量為研究對(duì)象,基于"規(guī)則"模型——Cubist以及樣條插值法、反距離加權(quán)法、自然鄰域法、普通克里金插值法、局部多項(xiàng)式插值法和徑向基函數(shù)插值法等6種GIS空間插值方法,選取2 000、1 500、1 000、800、500、300、200、150及90 m這9個(gè)不同的格網(wǎng)尺度,構(gòu)建Cd含量空間格局模型.選擇不同方法的最佳預(yù)測(cè)尺度和最優(yōu)模型參數(shù),預(yù)測(cè)廣東省土壤Cd含量分布.結(jié)果表明:(1)在相同尺度時(shí)Cubist方法預(yù)測(cè)結(jié)果都比傳統(tǒng)的空間插值結(jié)果精度高,格網(wǎng)大小為300 m×300 m時(shí)預(yù)測(cè)精度最高.其次是樣條插值法,其在1 500 m插值尺度上精度最高;(2)Cubist模型同時(shí)可以識(shí)別土壤Cd含量空間分布的驅(qū)動(dòng)因子.結(jié)果表明在37個(gè)影響Cd含量的自然和人為因子中,地質(zhì)類型是驅(qū)動(dòng)廣東省土壤Cd含量分布差異的主要因子;(3)Cd含量高值主要分布在珠三角地區(qū)及粵北少部分地區(qū).廣東省土壤Cd含量超過(guò)GB 15618~(-1)995中3級(jí)和2級(jí)標(biāo)準(zhǔn),即大于1.0 mg·kg~(-1)和0.3 mg·kg~(-1)的面積分別約為160 km~2和2 140 km~2,約占廣東省總面積的0.09%和1.18%.
[Abstract]:The spatial pattern of heavy metals in soil is of great significance to the prevention and control of soil heavy metal pollution. In this paper, the content of CD in Guangdong Province is taken as the research object. Based on the "rule" model cubist and spline interpolation method, inverse distance weighting method, natural neighborhood method, general Kriging interpolation method. The local polynomial interpolation method and the radial basis function interpolation method are six GIS space interpolation methods, and 2 000 / 1 500 / 1 000,800,500,300,200 are selected. The spatial pattern model of CD content was constructed with 9 different grid scales of 150 m and 90 m. The optimal prediction scale and model parameters of different methods were selected. The results show that the Cubist method is more accurate than the traditional spatial interpolation results in the same scale. When the grid size is 300m 脳 300m, the prediction accuracy is the highest, followed by the spline interpolation method, which has the highest accuracy on the scale of 1 500m interpolation. The cubist model can also identify the driving factors of CD spatial distribution in soil. The results showed that there were 37 natural and human factors affecting CD content. Geological types are the main factors driving the difference of CD content in soils in Guangdong Province. The content of CD in the soil of Guangdong Province was higher than that of grade 3 and grade 2 of GB 15618 ~ (-1) ~ (1) ~ (1) C ~ (2) in the Pearl River Delta region and a few parts of northern Guangdong Province. The areas above 1.0 mg 路kg ~ (-1) and 0.3 mg 路kg ~ (-1) were about 160 km~2 and 2 140 km~2, respectively. About 0.09% and 1.18 of the total area of Guangdong Province.
【作者單位】： 山西農(nóng)業(yè)大學(xué)資源環(huán)境學(xué)院;廣東省生態(tài)環(huán)境技術(shù)研究所廣東省農(nóng)業(yè)環(huán)境綜合治理重點(diǎn)實(shí)驗(yàn)室;
【基金】：廣東省科技計(jì)劃項(xiàng)目(2015B070701017,2014A040401059,2015A030401068) 國(guó)家自然科學(xué)基金青年科學(xué)基金項(xiàng)目(41601558) 廣東省科學(xué)院創(chuàng)新平臺(tái)建設(shè)專項(xiàng)
【分類號(hào)】：X53
【正文快照】： 廣州510650)自然界Cd元素一般存在于頁(yè)巖、海洋、湖相沉積物和磷灰石中[1],主要受地質(zhì)作用影響[2],一般含量較低.隨著人類活動(dòng)的不斷加強(qiáng),包括工業(yè)生產(chǎn)加速、快速城市化、道路密度的增大、人口密集化、電子垃圾焚燒、工業(yè)三廢的排放、化肥農(nóng)藥的施用、汽車尾氣排放、礦業(yè)開(kāi)采

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