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In order to find out completely the soil-wheat contaiminated by heavy metals in Tianjin sewage farm, we collect samples on the dry land and examinate contents of heavy metals in soil-wheat system. Firstly, the anthor evaluates that soil irrigated by sewage that has been contaminated slightly, the main polluting factors are Cd and Zn, and then the anthor evaluates soil according to different regions, soil types and irrigating water. Secondly, the anthor analyzes content and enrichment ability of heavy metals in different part of wheat, evaluates wheat is contaiminated by Cd widespreadly, only few samples polluted by Zn.Finally the anthor put up correlative analysis about heavy metal contents in the soil-wheat system, as well as plant enrichment coefficient and some physico-chemical properties of soil, and establishes a prognostic model about heavy metal content among wheat spike, soil, soil types, PH, organic matter and salinity with the quantifying theory.The prognostic accuracy of primarily contaminative factors is the best with compound correlative coefficient examining, the model can be founded.With improvement of living level, people need cleaner food.
为全面了解天津市污灌区农产品生产地土壤和旱地作物小麦的重金属污染状况,我们于2004~2005年对全市污灌区的土壤和小麦进行了采样,在对该区土壤—小麦系统中六种重金属元素(Cd、Cu、Pb、Zn、Cr和Ni)的含量进行检测的基础上,本文首先分析评价了污灌区农田土壤的环境质量总体已达到了轻度污染水平,主要的污染因子是Cd和Zn,同时对污灌区农田土壤分区县、土壤类型和不同灌水类型进行了评价;然后分析了重金属在小麦不同部位的含量与富集能力,评价了污灌区旱地作物小麦普遍遭受了Cd的污染,只有个别样点遭受了Zn的污染;最后对土壤—小麦系统重金属含量间以及植物富集系数与土壤部分理化性质间进行了相关分析,由于土壤类型是定性变量,本论文以数量化理论建立了小麦穗实中重金属含量与土壤中重金属全量、土壤类型、PH值、有机质和全盐量间的预测模型,经复相关系数检验,污灌区主要的污染因子Cd和Zn的预测精度最高,模型可以成立。
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The results showed that there existed significant difference in chlorophyll a, MDA and proline content among different treatments. No significant physiological variation was found in electrolyte exosmosis percentage, POD activity and proline content between the salt treatment and the control during the treatment while the parameters in drought and salt/drought treatment fluctuated remarkably.
结果表明:欧李的叶绿素a、丙二醛和脯氨酸含量在不同的逆境处理间差异显著;碳酸盐处理的电解质外渗率、POD活性、脯氨酸含量等生理指标变化平缓,与对照差异不明显;干旱处理和盐与干旱协同处理的各项指标波动很大。
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The correlation analysis indicated that positive correlations existed between electrolyte exosmosis percentage, MDA content and POD activity in both salt and drought treatments, and significant correlations were also found between electrolyte exosmosis percentage, POD activity and MDA content in NaHCO3 stress.
相关分析表明:不论是碳酸盐胁迫还是干旱胁迫,欧李的电解质外渗率、MDA含量和POD活性存在一定程度的正相关,碳酸盐处理下POD活性与电解质外渗率和MDA含量间达到显著的正相关。
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The results showed that the mutant contained high trehalose content and high cell survival rate kept even after 4 h 18 %vol alcohol treatment (no respiration deficiency existed), which indicated that high trehalose content could protect cells membrane and prevent DNA loss of mitochondria and exosmosis of intracellular materials.
结果表明,中性海藻糖酶缺失突变株细胞海藻糖含量较高,用18 %vol的酒精处理4 h后仍可保持高的细胞存活率,并且无呼吸缺陷型的出现,说明高海藻糖含量可以保护细胞膜,防止线粒体DNA丢失和胞内物质的外渗,与酵母的酒精耐性之间存在一定的关系。
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The study was supported by National Nature Science Foundation of China of ""Biological foundation study of electrical indexes assessing tree vigor"". The mechanism of tree's leaf and stem capacitance and the application of electrical indexes under environmental stresses were studied. The main conclusions are summarized as following:(1) The leaf capacitance had significant positive correlations with leaf exosmosis electro conductivity, exosmosis percentage and leaf absolute moisture content, had significant negative correlations with leaf electrolyte electro conductivity and had no correlations with leaf relative water content.
本研究在国家自然科学基金"林木健康状况评价的电指标生物学基础"的支持下,对树体叶片电容和树体干部电容的机理及外界胁迫因素作用对树体电指标的影响进行了初步研究,研究的主要结论包括:(1)树木叶片电容与单位质量叶片离子外渗液电导率、叶片细胞离子外渗百分率及叶片绝对含水率呈显著的正相关关系,与单位质量叶片总电导率呈显著的负相关关系,与叶片相对含水率的相关性不显著。
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In 1978, the Japanese education authority discovered the teaching at primary school has the orientation to overemphasize on the cramming of knowledge, so they began to expurgate and eliminate properly and comprehensively some content of the course and reselect and revise the music course content in order to improve its defects.
三、日本於西元一九七八年教育主管机关,发现国小教育有偏重知识之灌输倾向,为改善此缺失,全面适当删减课程内容,其中音乐课程内容亦重新精简修订。
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Methods: Determining paeoniflorin content by high performance liquid chromatography measurement conditions: mobile phase of acetonitrile -0.4% phosphoric acid solution (volume ratio 13∶87; detection wavelength 230 nm; flow rate 1.0 mL/min; and column temperature 25℃; and determining polysaccharide content by anthrone-sulfuric acid method. The extraction procedure of Langchuangling granule was measured, and the evaluated indexes were the rate of dry extra, contents of the paeoniflorin and the total polysaccharide with L9 (34) orthogonal test and preferential treatment of data.
采用高效液相色谱(high performance liquid chromatography,HPLC)法测定芍药苷含量[测定条件:流动相为乙腈-0.4%的磷酸水溶液(体积比为13∶87);检测波长230 nm;流速1.0 mL/min;柱温25℃];采用硫酸-蒽酮法测定总多糖含量,并以干浸膏得率、总多糖含量和芍药苷含量为指标,采用L9(34)正交实验,用综合评分法处理数据优选水提取工艺。
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If the content of the website is a mobile phone, but the content of the website is other however farfetched thing.
网站的内容如果是手机,但是网站的内容却是其他乱七八糟的东西。
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The content of abstract configuration basically is reflected in " the plutonomy is critically " the first fascicule and " capital is talked " hank the first in, the content of particular form basically is reflected in " capital is talked " the 7th when hank reachs the 3rd the 2nd piece in.
抽象形态的内容主要体现在《政治经济学批判》第一分册和《资本论》第一卷第一篇中,具体形态的内容主要体现在《资本论》第一卷第二篇至第三卷的第七篇中。
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The statistics of slice component showed that the content of quartz and felspar is low and the content of detritus are high.
碎屑岩成分成熟度低,主要为岩屑砂岩,极少量长石岩屑砂岩。
- 推荐网络例句
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And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.
同时,论述了一体化管理体系构建中的几个主要问题,包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。
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Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.
运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。
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If you're huffing and puffing at any point during the run, slow down and make sure you can take deep breathes.
如果你任何时候在跑步过程中气喘如牛,降低速度并且确保你能够深呼吸。