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1.
The application of biosolids to agricultural fields is becoming increasingly common. The effect of biosolids on the behavior of metals in different plants has been reported to be variable and ambiguous. A greenhouse experiment was conducted on a soil spiked with four rates of copper (Cu) (0, 50, 100, and 150 mg kg?1) and zinc (Zn) (0, 150, 300, and 450 mg kg?1) in lettuce culture. When Cu and Zn were spiked to anaerobically-digested biosolids, their availability in lettuce increased. Root and shoot fresh weight decreased due to a decrease in photosynthetic rate. superoxide dismutase (SOD) and peroxidases (POD) activity increased after the application of Cu and Zn. The bioavailability of Zn in lettuce was greater than that of Cu because of a higher transfer factor in plants and due to a higher endogenous Zn concentration.These results will allow for better fertilization management when biosolids are applied to tomato culture. 相似文献
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重金属单一污染对龙须草生长与生理生化特性的影响 总被引：6，自引：0，他引：6
试验研究了不同处理水平下Cd、Pb、Cu、Zn、As单一污染对龙须草生长和生理生化特性的影响。结果表明:龙须草地下部对重金属的抗性大干地上部,种植龙须草的污染土壤中Cd、Pb、Cu的土壤临界值可分别设定为10mg／kg、300mg／kg和100mg／kg;龙须草叶绿素含量随重金属处理浓度的增加呈先升后降趋势,但其总叶绿素含量和叶绿素a／b值均低于对照;龙须草SOD活性随Zn、As单一污染处理浓度的增加呈先升后降趋势,而随其他3种重金属处理浓度的增加呈下降趋势;龙须草CAT和POD的活性随As处理浓度的增加呈上升趋势,而随其他4种重金属处理浓度的增加呈先升后降趋势。 相似文献
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The objective of this work was to evaluate the affects of the application of composted biosolids on the accumulation of heavy metals (Cd, Cu, Ni, Pb and Zn) in lettuce leaves. Pots containing different proportions (0 to 100%) of composted biosolids were used to grow lettuce plants under greenhouse conditions. Dry and fresh weight, leaf area and Cd, Cu, Ni, Pb and Zn uptake were determined after harvest. It was found that the dry and fresh matter productions of the plants were significantly lower in the control treatment. The addition of composted biosolids caused a 20 and 40% increase in biomass accumulation. Cd and Pb concentrations in leaves were below detection limits (0.05 mg kg?1) in all treatments. Zn concentration in leaves increases as compost proportion decreases, ranging from 57.2 to 80.4 mg kg?1. Composted biosolids application increased the Cu and Ni plant concentrations, ranging from 5.1 to 9.8 mg Cu kg?1 and 2.3 to 3.7 mg Ni kg?1. In all treatments the proportions of heavy metals in plants were below the international standards of toxicity. The results allow us to suggest that, in short-term applications, composted biosolids could be used as soil amendment for lettuce production, without toxic effects in the chemical composition of the plant. 相似文献
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锌铬复合污染对水稻根系抗氧化酶活性的影响 总被引：9，自引：0，他引：9
为了研究水稻在金属复合污染条件下的适应过程,该文就成都平原两种常见的重金属污染元素(锌、铬)对土壤复合处理后,进行水稻盆栽试验.结果表明,锌铬复合污染条件下,在水稻不同生育期,水稻根系3种抗氧化酶(SOD,POD和CAT)活性随锌、铬浓度的增加而表现出不同的变化趋势.在水稻分蘖期,随铬浓度的增加,水稻根系SOD活性和POD活性呈先降后升的变化趋势;随锌浓度的增加,水稻根系SOD活性和POD活性呈升高的趋势;而水稻根系CAT活性则随锌、铬浓度的增加呈一定的降低趋势.在水稻孕穗期,随锌、铬浓度的增加,水稻根系SOD活性呈先降后升的变化趋势,POD活性及CAT活性则呈降低的趋势.在水稻灌浆结实期,水稻根系SOD、POD及CAT活性均呈一定的降低趋势.水稻籽粒产量随锌、铬浓度的增加呈降低的趋势.锌、铬浓度对水稻籽粒产量产生了复合效应,并与水稻籽粒产量有极显著的线性回归关系.这表明水稻通过调节自身的生理代谢能提高对锌铬复合污染的生态适应性,这能为培育适合重金属污染地区生长的水稻品种提供理论基础. 相似文献
5.
施磷对镉胁迫下黄瓜苗期光合作用及抗氧化酶系统的影响 总被引：1，自引：0，他引：1
6.
《Journal of plant nutrition》2013,36(12):2745-2761
ABSTRACT Effect of cadmium (Cd) on biomass accumulation and physiological activity and alleviation of Cd-toxicity by application of zinc (Zn) and ascorbic acid in barley was studied, using semisolid medium culture including 15 treatments [four Cd concentration treatments: 0.1, 1, 5, 50?µmol?L?1, four treatments with addition of 300?µmol?L?1 Zn or 250?mg?L?1 ascorbic acid (ASA) based on these four Cd concentrations, respectively, and three controls: basic nutrient medium, and with Zn or ASA, respectively]. Cadmium addition to semisolid medium, at a concentration of 1, 5, and 50?µmol?L?1, inhibited biomass accumulation and increased malondialdehyde (MDA) content of barley plants, while the addition of 0.1?µmol?L?1 Cd increased slightly dry mass. There was a tendency to a decrease in Zn, copper (Cu) concentrations both in shoots and roots and iron (Fe) in shoots of barley plants exposed to 1 to 50?µmol?L?1 Cd. In addition, there were indications of a stress repose characterized by increased superoxide dismutase (SOD) and peroxidase (POD) activities relative to plants not subjected to Cd. The physiological changes caused by Cd toxicity could be alleviated to different extent by application of 300?µmol?L?1 Zn or 250?mg?L?1 ASA in Cd stressed plants. The most pronounced effects of adding Zn or ASA in Cd stressed medium were expressed in the decreased MDA and increased biomass accumulation, e.g., MDA contents were reduced (p≤0.01) by 4.8%–17.8% in shoots and 0.5%–19.7% in roots by adding 300?µmol?L?1 Zn, in 50?µmol?L?1 Cd stressed plants, and by 1.3%–7.4% in shoots and 2.6%–4.5% in roots by application of 250?µmol?L?1 ASA, respectively. However, ASA addition may enhance Cd translation from root to shoot, accordingly, ASA would be unsuitable for the edible crops grown in Cd contaminated soils to alleviate phytotoxicity of Cd. 相似文献
7.
镉胁迫下生物炭与锌/钾叶面肥促进烟草生长降低镉富集的协同效应 总被引：4，自引：0，他引：4
[目的]生物炭和叶面肥在单独调控重金属胁迫条件下植物生长及重金属离子吸收方面的应用价值已被一些研究证实,然而它们在土壤重金属镉污染修复中的耦合效应及其机制尚不十分清楚。烟草为镉易富集植物,研究生物炭和锌/钾叶面肥单施或联合施用对烟草生长和镉富集特性的影响,为镉污染土壤的修复及烟草安全生产提供理论依据。[方法]采用盆栽模拟轻度土壤镉污染胁迫试验,供试烟草品种为‘中烟100’。设置6个试验处理:对照(CK)、土施生物炭20 g/kg(B)、喷施0.5%ZnSO4叶面肥(Zn)、喷施0.5%KH2PO4叶面肥(K)、生物炭+喷施ZnSO4叶面肥(B+Zn)、生物炭+喷施KH2PO4叶面肥(B+K),每个处理重复8次。将烟草分割为根、茎、下部叶(从下到上1~5片)、中部叶(6~10片)、上部叶(11~15片)5部分。测定株高、生物量、丙二醛含量(MAD)、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性、烟株各部位的镉含量,计算了镉富集和转运系数,分析了土壤中镉形态的变化。[结果]1)单独施用叶面肥较单独施用生物炭更有利于增强镉胁迫下叶片的抗氧化性能,促进烟株生长。与B处理相比,Zn和K处理的MDA含量分别降低12.8%和15.1%,POD活性分别增加32.2%和29.9%,CAT活性分别增加25.5%和18.2%(P<0.05),Zn和K两处理之间的抗氧化酶活性无显著差异(P>0.05)。单独施用生物炭较单独施用叶面肥更有利于降低土壤中镉的生物有效性。与Zn和K处理相比,B处理的土壤弱酸提取态镉含量分别降低19.0%和19.3%,可还原态镉含量分别降低22.3%和23.9%(P<0.05)。单独喷施叶面肥对土壤镉形态无显著影响(P>0.05)。2)生物炭和叶面肥配施具有叠加效应,且B+Zn处理对促进镉胁迫下烟株生长和减少烟株镉吸收方面效果大于B+K处理。与CK、B、Zn处理相比,B+Zn处理的株高分别增加52.8%、25.9%和11.8%,地上干重分别增加146%、89.1%和45.3%,SOD活性分别增加29.8%、19.7%和11.0%,POD活性分别增加94.0%、64.1%和24.1%,CAT活性分别增加183.8%、90.9%和52.2%,烟株根镉含量分别减少53.9%、25.2%和31.6%,茎镉含量分别减少74.5%、53.9%和63.7%,上部叶镉含量分别减少63.1%、18.8%和40.1%,中部叶镉含量分别减少63.6%、27.7%和35.3%,下部叶镉含量分别减少63.8%、34.1%和46.9%,烟株镉生物富集系数分别降低64.4%、31.0%和48.4%,镉生物转运系数分别降低33.3%、20.2%和28.5%,土壤中弱酸提取态镉含量分别降低19.5%、7.5%和19.0%,土壤中还原态镉含量分别降低22.9%、2.0%和20.8%,土壤中可氧化态镉含量分别增加62.5%、5.6%和54.6%,土壤中残渣态镉含量分别增加206.9%、10.7%和174.7%。与B+K处理相比,B+Zn处理的烟株地上干重增加18.3%,上部叶、中部叶、下部叶镉含量分别减少8.4%、13.9%和16.9%,镉生物富集系数和转运系数分别降低20.8%和8.5%。[结论]在镉污染胁迫下,土施生物炭可以降低土壤中镉的生物有效性,减少烟草的吸收。叶面喷施锌、钾肥可以提高烟草植株的抗氧化性能,促进烟株生长。生物炭配合叶面肥具有明显的协同作用,降低烟草中镉的运转系数和富集系数的效果显著高于锌/钾叶面肥单独施用。在本试验条件下,生物炭配合喷施硫酸锌的效果好于生物炭配合喷施磷酸二氢钾,可作为提高烟草生产安全及土壤镉污染修复的一项有效措施。 相似文献
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氮素对花铃期干旱再复水后棉花纤维比强度形成的影响 总被引：2，自引：1，他引：1
2005—2006在南京农业大学卫岗试验站进行盆栽试验,设置正常灌水和棉花花铃期土壤短期干旱处理,每个处理再设置3个氮素水平（N 0、240、480 kg/hm2）,研究氮素对花铃期短期干旱再复水后棉花纤维比强度形成的影响。结果表明,干旱处理结束时,干旱处理棉花的纤维可溶性蛋白含量较正常灌水处理显著降低,而内源保护酶,即:超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)活性升高,丙二醛（MDA）含量增加;纤维加厚发育相关酶,即:蔗糖合成酶、磷酸蔗糖合成酶、β-1,3-葡聚糖酶和IAA氧化酶的活性均显著降低。在复水后第10d,干旱处理棉花的纤维内源保护酶活性迅速恢复到正常灌水处理水平,MDA含量降低,但纤维发育相关酶的活性仍低于相应正常灌水处理,纤维比强度亦显著低于正常灌水处理。在棉花的纤维加厚发育期土壤短期干旱再复水条件下,以N 240 kg/hm2最有利于形成高强纤维。干旱期间该处理棉花的纤维内源保护酶活性高,细胞膜脂过氧化程度最低,其纤维加厚发育相关酶活性均最高;复水后该处理的纤维内源保护酶活性迅速恢复,MDA含量最低,棉花的纤维加厚发育相关酶活性仍处于最高值,有利于纤维素的合成与累积,最终纤维比强度亦最大。施氮不足（N 0 kg/hm2）或过量施氮（N 480 kg/hm2）均表现出相反的趋势。 相似文献
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Benítez E. Romero E. Gómez M. Gallardo-Lara F. Nogales R. 《Water, air, and soil pollution》2001,132(1-2):75-87
Generally, the potential for biosolids (digested or composted)to contribute heavy metals to the soil-plant system has beencompared with commercial fertilizers and other organic wastesbut not with biosolids-ash. An column study was conducted in agreenhouse to determine the availability, extractability andleachability of metals in a degraded, non-calcareous soilamended with different biosolids (200 Mg ha-1). Thebiosolids investigated were dewatered, anaerobically digestedbiosolids, composted biosolids and biosolids-ash. The columns(26 cm) were planted with wheat (Triticum aestivum L. cvMexa). The addition of digested biosolids decreased the drymatter yield of wheat. Treatments including organic biosolidsincreased Cu and Zn concentrations in wheat roots, straw andgrain, whereas the addition of biosolids-ash did not affect theconcentrations of these metals in wheat. Concentrations of Ni,Co, Pb, Cr and Cd in wheat were below reliable detection limits(0.06, 0.05, 0.1, 0.06 and 0.02 mg kg-1, respectively).After harvesting, total and AB-DTPA extractable Cu, Zn and Pbincreased in the upper layer of the soil amended with thedifferent biosolids studied, whereas levels of AB-DTPAextractable Ni and Co were affected only when the soil wasamended with digested or composted biosolids. Total chromiumincreased only in treatments including organic biosolids. TheAB-DTPA extractable Cu, Zn and Pb in the lower layer of thesoil in treatments including biosolids evidenced downwardmovement of these metals. However, absence of these metals incolumn leachates indicates that this movement was gradual. 相似文献
12.
镉处理根表铁膜对水稻吸收镉锰铜锌的影响 总被引：2，自引：0，他引：2
本试验利用营养液和土壤培养系统,研究不同Fe、 Cd处理下根表铁膜对水稻吸收Cd、 Mn、 Cu、 Zn的影响。土壤中Fe的水平为0、 1、 2 g/kg Fe（以FeSO47H2O的形式供应）,Cd 的水平为0、 2、 10 mg/kg Cd（以3CdSO48H2O的形式供应）。营养液中Fe和Cd的水平分别为0、 10、 30、 50、 80、 100 mg/L Fe 和 0、 0.1、 1.0 mg/L Cd。收获后测定水稻根表、 根中和地上部Cd、 Fe、 Mn、 Cu、 Zn 含量。试验结果表明,两种培养方式下,随着介质中Fe浓度的增加,水稻根表铁膜（DCB-Fe）逐渐增多。土壤培养方式下,根表铁膜中Cd 和 Mn 含量随铁膜量增加而略有增加,所有元素含量均表现为根中大于铁膜中。营养液培养条件下,根表铁膜中Mn和Cu含量在高量 Fe 供应时有所增加, Mn、 Cu、 Zn表现为铁膜中大于根中。根表铁膜中Zn含量在两种培养方式下均未呈现一定规律性变化。根中和地上部 Cd、 Mn、 Cu、 Zn 含量一般都随介质中Fe浓度的增加而下降,Cu和Zn含量在加Cd处理中下降。以上结果证明,铁膜对Cd 的吸附阻挡能力有限,对Mn、 Cu、 Zn 的吸附作用因培养方式和元素种类不同而有所差异,植株体内微量元素含量的下降主要与它们之间的相互抑制作用有关。 相似文献
13.
Amir Hossein Saeidnejad Mohammad Kafi Mohammad Pessarakli 《Communications in Soil Science and Plant Analysis》2016,47(8):1048-1057
In order to evaluate the combined effects of salinity stress and Zinc (Zn) applications on wheat growth, an experiment was conducted with the treatments included four Zn levels (0, 10, 20, and 40 mg/kg of dried soil) and three levels of sodium chloride (NaCl) salinity of irrigation water (0, 100, and 200 mM NaCl). Salinity caused a significant reduction in chlorophyll a and b content. The activity of catalase (CAT), superoxide dismutase (SOD), and glutathione reductase (GR) was enhanced as salinity level was increased. The significant enhancement in concentration of sodium due to the salinity was alleviated by Zn addition. Potassium content was increased by Zn treatments. A substantial increase was observed in leaf Zn concentration as the applied level of Zn was increased. Overall, these results indicate some positive and negative interactions of salinity and Zn application, which could be helpful in management of the saline soil and water. 相似文献
14.
重金属铜和锌胁迫下的小麦冠层反射光谱特征 总被引：2，自引：0，他引：2
目前关于土壤重金属污染对作物的光谱影响仍然处于探索阶段,受植物种类和环境等因素的影响,植物重金属胁迫机理的诊断仍存在不明确的问题,作物不同生长阶段对不同重金属的耐受程度存在差异。为了探究快速监测作物受重金属污染胁迫状况,采用田间小区试验,利用光谱分析方法研究了土壤重金属不同质量分数铜(0、100、300、600、900 mg/kg)和锌(0、250、500、750、1 000 mg/kg)处理下小麦分蘖期、拔节期和抽穗期冠层光谱特征。结果表明,小麦在分蘖期和拔节期冠层光谱在可见光(350~760 nm)波段内反射率总体随着铜、锌污染浓度的增加而升高,而在近红外(760~900 nm)波段内反射率随铜、锌处理浓度的增加而降低;分蘖期不同浓度铜、锌处理下,小麦冠层光谱出现红边蓝移和红谷蓝移现象;分蘖期铜处理在600、900 mg/kg和拔节期铜处理在900 mg/kg下小麦红边归一化指数值(NDVI705)均低于0.2;分蘖期锌处理在750和1 000 mg/kg下小麦红边归一化指数值(NDVI705)均低于0.2;该试验中引起小麦受到胁迫作用冠层光谱响应的铜临界浓度介于300与600 mg/kg之间,而锌临界浓度介于500与700 mg/kg之间。 相似文献
15.
硅对Cd胁迫下黄瓜苗期光合及抗氧化酶系统的影响 总被引：1，自引：0，他引：1
为了解石灰性土壤硅对Cd胁迫下黄瓜苗期叶片的光合特性和抗氧化酶系统及对实际土壤Cd毒害植物的防治,研究了硅介入下Cd污染土壤中黄瓜苗期的叶片净光合速率(P_n)、气孔导度(G_s)、蒸腾速率(T_r)、胞间CO_2(C_i)等光合作用指标,叶绿素含量,丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)等抗氧化酶系统等相关参数。结果表明:与空白相比较,单施Cd处理下,P_n、G_s、T_r和叶绿素含量下降,Ci提高。硅介入后,能明显提高P_n、G_s、T_r和叶绿素总量,降低C_i含量。当C_d含量为5mg/kg时,硅施加量100~200mg/kg情况下,与空白相比,P_n、G_s、T_r和叶绿素上升,C_i下降,但100mg/kg与200mg/kg的硅处理差异不明显,300mg/kg的硅添加量效果最好。对于抗氧化酶系统,与空白相比较,土壤Cd含量为3~5mg/kg时,3类抗氧化酶的活性均受到显著抑制,200~300mg/kg硅的引入可明显提高SOD、POD、CAT活性,降低MDA值。可见,硅的引入可明显改善Cd胁迫下黄瓜叶片的光合特性和抗氧化酶系统。施用少量硅肥在石灰性土壤中对缓解植物Cd毒害具有一定的应用前景。 相似文献
16.
影响山核桃林地土壤生产性能的主要肥力因子及其临界区间 总被引：1，自引：0，他引：1
【目的】土壤养分是植物生存的必要条件,探讨山核桃(Carya cathayensis Sarg.)主产区林地土壤肥力因子及其对土壤生产性能的影响,为山核桃的栽植和可持续发展、土壤培肥提供科学依据。【方法】在浙江省山核桃主产区,随机选择58个典型乡镇的山核桃林采集土样,测定了pH、有机质、碱解氮、有效磷、速效钾、有效钙、有效镁、有效铁、有效锰、有效铜、有效锌、有效硼12个肥力因子水平,运用主成分分析和回归分析方法,分析了它们对山核桃生长、感病等级、产量等级的影响以及丰缺临界区间。【结果】主成分分析前5个因素(PC1、PC2、PC3、PC4、PC5)的累计贡献率达78.49%。PC1的主要荷载为土壤pH、有效钙和有效镁含量,PC2的主要荷载是微量元素和有效磷含量,PC3是有机质和碱解氮含量,PC4和PC5分别是有效硼和速效钾含量。林分生长性状中,生长势等级与pH、速效钾、有效钙、有效镁、有效铜、有效锌显著负相关(P <0.01),干腐病感病等级与pH、有效钙、有效镁显著负相关(P <0.01),产量等级与pH、有效钙、有效镁、有效磷、有效锌显著正相关(P <0.01)。回归模型分析得出,土壤pH、速效钾和有效钙、有效镁、有效铜、有效锌是当前栽培措施水平下影响山核桃生长的关键土壤肥力因子。综合评价后发现,研究区现有约57%的山核桃林地土壤综合肥力低于平均水平。【结论】对山核桃林地土壤生产性能影响最大的因素是土壤pH、有效钙和有效镁含量,其次是微量元素和有效磷含量,有机质、速效钾含量也有一定的影响。山核桃主产区的林地土壤关键指标丰缺范围:pH 5.19~5.70、速效钾87~129 mg/kg、有效钙817~1374 mg/kg、有效镁93~145 mg/kg、有效铜1.36~4.39 mg/kg、有效锌0.78~2.33 mg/kg。 相似文献
17.
[目的]探讨施钾方式(一次性施入和钾肥后移)对高产春玉米根系特性的影响,为高产春玉米钾素养分调控提供理论依据。[方法]以金山27玉米为供试品种,2个施钾水平(K2O 150和300kg/hm2)及施钾后移处理下,测定不同生育时期各土层根系干物质重、根系活力及其酶活性,成熟期测定根条数、根幅。[结果]300kg/hm2施钾水平与150kg/hm2施钾水平相比,各土层根系干重增加,尤以吐丝前0—20cm土层为根干重增加幅度最大,20—60cm土层根干重占总干重比例减小,尤以乳熟期为甚;各土层根条数、最大根幅增加,最大根幅下移;各生育时期各土层根系活力、超氧化物歧化酶(SOD)活性和过氧化物酶(POD)活性随施钾量增加而增加,丙二醛(MDA)含量下降。相同施钾水平下,施钾后移各生育时期0—60cm各土层根系干重减小;0—20cm土层根干重占总干重比例增加;最大根幅、根条数及最大根幅深度均减少,且随土层深度增加差异增大;各土层根系活力、SOD酶活性和POD酶活性降低,MAD含量增加。[结论]300kg/hm2施钾量较150kg/hm2施钾量促进玉米根系生长,且延缓根系衰老,尤其可促进深层根系的生长;同一施钾水平下,施钾后移则促进作用不明显,甚至降低了根系的干重。 相似文献
18.
氧化/磺化腐殖酸对潮土中Cu、Zn、Fe、Mn有效性的影响 总被引：1，自引：0，他引：1
19.
Abdelnasser Galal 《Journal of plant nutrition》2019,42(8):915-927
The present study was conducted to investigate the effects of Zn application to salt stressed eggplant (Solanum melongena L.) seedlings grown in vitro and whether it can alleviate the deleterious effects of salinity or not. Zinc (0, 5, 10 and 20?mg/L) and sodium chloride (NaCl) at different concentrations (0, 50, 100 and 150?mM) were added to solidified half strength MS medium placed in 250?mL glass jars. The treatments were arranged in a 4?×?4 factorial experiment in a completely randomized design with four replications. Application of Zn to growing seedlings at different concentrations (5, 10 or 20?mg/L) increased the length of shoot and root and their dry weights, as well as enhanced the photosynthetic pigment contents and leaf relative water content compared to control. However, the application of NaCl to growing seedlings at different concentrations (50, 100 and 150?mM) significantly reduced the above mentioned attributes compared to control and those of Zn treatments alone. Treatment of seedlings with either Zn (5, 0 or 20?mg/L) or NaCl (50, 100 or 150?mM) significantly increased the proline content and the antioxidant enzyme activities of superoxide dismutase (SOD), peroxidase (POX) and ascorbate peroxidase (APX) in growing seedlings. However, the application of Zn to salt stressed seedlings mitigated the deleterious effects of salt stress in growing seedlings and increased the tolerance of seedlings to its deleterious effects. 相似文献
20.
硅作用下铜对小麦幼苗生理特性影响研究 总被引：2，自引：1，他引：1
通过水培试验,研究了在不同加硅量(0,30,60,90,120,150 mg/L,以SiO2计)作用下,铜(10 mg/L,以Cu计)对小麦幼苗叶绿素含量、抗氧化酶系统活性(SOD、POD、CAT)、脯氨酸含量、可溶性蛋白含量以及MDA含量的影响,结果表明:在加硅量(30,60,90 mg/L,以SiO2计)作用下,小麦幼苗叶绿素a含量、抗氧化酶系统(SOD、POD)活性、脯氨酸含量、可溶性蛋白含量的升高以及MDA含量的降低,减轻了铜对小麦幼苗的毒害作用;在加硅量150 mg/L作用下,小麦幼苗叶片可溶性蛋白含量的降低,MDA含量的升高,加重了铜对小麦幼苗的毒害作用。研究结果表明,加硅处理能够在一定浓度范围内缓解铜对小麦幼苗的毒害作用,从而为铜毒害的小麦区域增施硅肥提供理论依据。 相似文献