本文選題：重金屬 + 土壤��； 參考：《西南農業(yè)學報》2017年02期

【摘要】：為了解不同植被配置模式的河岸防護林土壤重金屬的含量特征和污染狀況,提出能有效降解土壤重金屬危害的植被配置模式。本文選擇了成都市沙河生態(tài)景觀防護林帶中的喬灌草、喬草、灌草以及單層灌木林和草坪等5種典型植被配置模式林分,測定了Mn、Cr、Co、Ni、Cu、Zn、Cd和As等重金屬和全N、全K和全P等主要營養(yǎng)元素在土壤中的分配狀況;并對土壤重金屬的生態(tài)風險進行了評價。1 Mn、Zn、Cr和Pb等8種重金屬元素含量在不同植被配置模式下均有顯著性差異(P0.05),總體表現(xiàn)為Mn含量最高,Zn次之,再次是CrPbNiCuCo;As含量最低。2根據(jù)土壤環(huán)境質量標準(GB15618—1995)評價結果表明,Cr、Ni、Cu、Co和As在5中植被配置模式下均沒有超過臨界值,Zn在5種植被配置模式下的土壤含量均超過臨界值;Mn和Pb則表現(xiàn)為部分配置模式下超過臨界值;3土層中分配上,各元素總體表現(xiàn)為土層20~40 cm含量高于0~20 cm。4通過相關性對重金屬的來源初步解析表明,0~20 cm土層中重金屬來源明顯比20~40 cm土層復雜。5Mn、Cr、Co等8種重金屬元素在5種植被配置模式下主要表現(xiàn)為未污染或輕度污染和輕度危害。喬灌草配置模式I(植被從上到下依次為:香樟、女貞+十大功勞、迎春+鳶尾)重金屬含量最低,綜合污染指數(shù)和污染的生態(tài)風險指數(shù)最低。
[Abstract]:In order to understand the characteristics of heavy metals content and pollution in riparian shelterbelts with different vegetation allocation patterns, a vegetation allocation model which can effectively degrade heavy metals in soil was proposed. In this paper, five typical vegetation allocation models, such as Arbor and Irrigation, Arbor Grass, Irrigation, single layer shrub and Lawn, are selected in the shelterbelt of Shahe Ecological Landscape in Chengdu. The distribution of heavy metals, total N, total K and total P in soils, such as heavy metals, total N, total K and total P, were determined. The ecological risk of heavy metals in soil was evaluated. The contents of 8 heavy metals, such as mn, Zn, Cr and Pb, were significantly different under different vegetation patterns (P0.05). Again, CrPbNiCuCoAs content is the lowest .2 according to the soil environmental quality standard (GB15618-1995), the results show that both CrPbNiCuCoAs Co and as do not exceed the critical value under 5 vegetation allocation modes. The distribution of mn and Pb in the soil layer above the critical value of mn and Pb is higher than the critical value in the partial collocation mode. The results showed that the content of heavy metals in 2040 cm soil layer was higher than that in 0 ~ 20 cm.4 soil layer. The preliminary analysis of the source of heavy metals showed that the heavy metal source in the soil layer of 20 ~ 20 cm soil layer was obviously more complicated than that in 20 ~ 40 cm soil layer. 5MnCU Cr ~ (2 +) Co and other eight heavy metal elements were mixed in 5 planting plants. The main performance of the model is no pollution or mild pollution and slight harm. The distribution model I of Arbor and Irrigation grasses (from top to bottom): camphor camphora, Ligustrum privet, Iris japonicus) had the lowest heavy metal content, the comprehensive pollution index and the ecological risk index of pollution were the lowest.
【作者單位】： 四川省林業(yè)科學研究院;
【基金】：林業(yè)公益行業(yè)專項課題“美麗城鎮(zhèn)森林景觀的構建技術研究與示范”(201404301)
【分類號】：X53;X173

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