本文選題：菲　切入點：欒樹　出處：《中南林業(yè)科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著工業(yè)化的發(fā)展和城市化水平不斷提高,我國土地環(huán)境污染狀況隨之變得極為嚴重。利用植物來降解土壤有機污染物,修復(fù)環(huán)境污染是目前最具潛力的土壤生物修復(fù)技術(shù)之一。本研究選取欒樹(Koelreuteria paniculata)與樟樹(Cinnamomumcamphora)這兩種我國南方城市常用的綠化樹種為研究對象,擬定菲為多環(huán)芳烴代表物,設(shè)置菲濃度為LO:0 mg·kg~(-1),L1:100mg·kg~(-1),L2:1000 mg ·kg~(-1)3個處理水平,選取每一季度(Q1、Q2、Q3、Q4)的代表天進行取樣,分析比較其根系分泌物中全碳、全氮含量及根系活性的季節(jié)動態(tài),探討其根系分泌物數(shù)量的動態(tài)特征及其在菲脅迫下根系分泌物的響應(yīng)機制,以期為被PAHs污染的土壤提供植物修復(fù)的理論參考。同時,有望為城市森林布局、建設(shè)和管理提供重要的指導(dǎo)作用。其研究結(jié)果表明:欒樹根系分泌物中TC、TOC的含量大多高于樟樹。四個季度中欒樹根系分泌物中TC的含量在Q1、Q2和Q4的L0處理水平下低于樟樹,其余各季度各處理水平下均高于樟樹,尤其是在L2處理水平下,兩樹種在Q2存在極顯著性差異(P0.01),其余三季度也表現(xiàn)出顯著性差異(P0.05);四個季度中欒樹根系分泌物中TOC的含量Q1、Q2的L0處理水平下低于樟樹,其余各季度均高于樟樹,尤其是在L2處理水平下,兩樹種在Q2存在極顯著性差異(P0.01),Q1、Q4也存在顯著性差異(P0.05);欒樹根系分泌物中TN的含量除在Q2的L0處理水平下低于樟樹,其余各季度均高于樟樹,并在Q1的L2處理水平下存在極顯著性差異(P0.01),在Q3的L1、L2處理水平下均存在顯著性差異(P0.05)。欒樹根系總吸收面積和活躍吸收面積在四季度中,只有Q1的L0處理水平,Q2的L2處理水平,Q3的L0、L1處理水平低于樟樹,其余各季度各處理水平均高于樟樹。四個季度,欒樹根系分泌物中TC、TOC與TN的含量經(jīng)不同濃度菲處理后基本均高于樟樹,這說明欒樹根系分泌量大于樟樹;欒樹根系吸收總面積和活躍面積在L1、L2處理水平下有三個季度均高于樟樹,這說明在菲脅迫下,欒樹根系活性高于樟樹。通過菲脅迫下根系分泌量和根系活性的比較,表明欒樹對菲的添加表現(xiàn)出了一定的耐受作用,而樟樹根系則表現(xiàn)出受脅迫現(xiàn)象,因此,欒樹相較于樟樹具有較好的耐菲的能力。
[Abstract]:With the development of industrialization and the increasing level of urbanization, the pollution of our country's land environment becomes very serious. Plants are used to degrade soil organic pollutants. Remediation of environmental pollution is one of the most promising soil bioremediation techniques at present. In this study, Koelreuteria paniculata and Cinnamomum camphora), two common greening trees in southern cities of China, were selected as the research objects, and phenanthrene was chosen as the representative of polycyclic aromatic hydrocarbons (PAHs). The concentration of phenanthrene was LO:0 mg 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1). The seasonal dynamics of total carbon, total nitrogen content and root activity in root exudates were analyzed and compared by selecting the representative days of phenanthrene concentration as LO:0 mg 路kg ~ (-1) 路kg ~ (-1) 路L ~ (-1): 1: 1 mg 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路L ~ (-1). The dynamic characteristics of root exudates and the response mechanism of root exudates under phenanthrene stress were discussed in order to provide theoretical references for phytoremediation of soils contaminated by PAHs. The results showed that the content of TCU TOC in root exudates of Luan was higher than that of camphor, and the TC content in root exudates of Luan in four seasons was lower than that of camphor at Q1Q2 and Q4 L0 levels. In the other seasons, all the treatments were higher than those of camphor trees, especially under L2 treatment. There was a very significant difference between the two species in Q2, the other three seasons also showed a significant difference (P0.05), the content of TOC in root exudates of Luan was lower than that of camphor at L0 level in four seasons, and the other seasons were higher than that of camphor. Especially under L2 treatment, there was a very significant difference between the two species in Q2. The TN content in root exudates of Luan tree was higher than that of camphor tree in other seasons, except that in Q2 L0 treatment, there was also a significant difference in Q2 between the two species. There was a significant difference between L2 treatment and Q3 treatment in L2 and Q3, respectively. The total absorption area and active absorptive area of Luan tree root were all different in the fourth quarter, and there were significant differences in Q1 treatment and Q3 treatment in L2 and Q3 treatments respectively, and there were significant differences in Q1 treatment and Q3 treatment in L2 treatment and Q3 treatment in L2 treatment and Q3 treatment, respectively. Only Q1, L0, Q2, L2, Q3, L0 and L1, were lower than camphor, the other seasons were higher than camphor. The content of TCU TOC and TN in root exudates of Luan was higher than that of camphor after different concentrations of phenanthrene, which indicated that the root exudation of Luan was larger than that of camphor. The total area of root absorption and active area of Luan tree were higher than that of camphor tree in three seasons under L _ (1) L _ (2) treatment, which indicated that the root system activity of Luan tree was higher than that of camphor tree under phenanthrene stress, and the root exudation and root activity were compared under phenanthrene stress. The results showed that Luan had a certain tolerance to phenanthrene, while the root system of camphor showed stress. Therefore, Luan had a better ability to tolerate phenanthrene than camphor.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X173;S792.99;S792.23
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本文編號：1603571