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the superior class
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     Lake Superior
     世界最大的淡水湖:苏必利尔湖
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     Its efficiency is superior to 80%.
     重量轻,效率大于80%。
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     The system is superior and practical.
     该系统具有优越性和实用性。
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     The Superior Property of PEN
     聚萘二甲酸乙二醇酯(PEN)的优异特性
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     On L-injective class
     关于L-内射类
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Statistical analysis of the soil mites distribution was done in the habitats of alpine tundra, coniferous forest,mixed forest,and Pinus sylvestriformis in the north slope of Chang Bai shan. The data was collected in June 1983 and 1984.The results are. 1.The distribution of soil mites is of random clumped and it has appearance of negative binomial distribution type in all of the four habitats. 2. For the test for significance of mite and oribati,there is no significant difference within the habitats of alpine...

Statistical analysis of the soil mites distribution was done in the habitats of alpine tundra, coniferous forest,mixed forest,and Pinus sylvestriformis in the north slope of Chang Bai shan. The data was collected in June 1983 and 1984.The results are. 1.The distribution of soil mites is of random clumped and it has appearance of negative binomial distribution type in all of the four habitats. 2. For the test for significance of mite and oribati,there is no significant difference within the habitats of alpine tundra,coniferous forest and Pinus sylvestriformis forest.respectively. While the difference is exist when the four habitats are compared together. The Mesostigmata, Prostigmatmata are of different patterns in comparison of the habitats and number. 3.Both the highest of evenness degree and diversity index is occured in the mixed forest and followed by the alpine tundra,the coniferous forest and the Pinus sylvestriformis forest in proper order. 4.The superior class group is of twelve species in the Pinus sylvestrifomis forest three species in the mixed forest, and five species in the conifoerus forest and alpine tundra.

本文对长白山北坡四种林型中土壤螨类的类群和数量进行了调查,就螨类的分布型,样地间数量差异、多样性指数及均匀度,优势类群等进行了统计分析,对四种林型中螨类的数量分布与生境间的关系作了初步地探讨。

The plot and field experiments were conducted to study the effect of humic acid on the soil environ-ment and mineral nutrition of flue-cured tobacco.The results indicated that humic acid can reduce pH val-ue in soil,increase the content of organic matter up to2.68-18.70percents,and improve the activity of saccharase and phosphatase in soil up to6.03-51.87and1.99-22.93percents respectively.Thus,the soil nutrition condition is improved.Absorbing ability to mineral materials of flue-cured tobacco is improved...

The plot and field experiments were conducted to study the effect of humic acid on the soil environ-ment and mineral nutrition of flue-cured tobacco.The results indicated that humic acid can reduce pH val-ue in soil,increase the content of organic matter up to2.68-18.70percents,and improve the activity of saccharase and phosphatase in soil up to6.03-51.87and1.99-22.93percents respectively.Thus,the soil nutrition condition is improved.Absorbing ability to mineral materials of flue-cured tobacco is improved by the action of the certain amount humic acid.The mineral materials of flued-cured tobacco leaves such as P 2 O 5 ,K 2 O,B,Mg ,Zn are also more increased than the control.Humic acid can also improve the ratio of the superior class,unit leave weight ,output value and yield of cured leaves.Furthermore,the important chemical elements of tobacco leaves are better matched and all quality indexes are more reasonable in cured leaves of the humic acid treatment .The optimum amount of humic acid used in flue-cured tobacco planting is120kg /hm 2 .

采用烤烟盆栽和大田试验相结合的方法,进行了腐殖酸对土壤环境和烤烟矿质营养影响的研究。试验结果表明,腐殖酸可在一定程度上降低土壤pH值;增加土壤有机质含量2.68%~18.70%;土壤中的蔗糖酶和磷酸酶活性分别提高6.03%~51.87%和1.99%~22.93%,土壤营养状况随之改善。在一定用量腐殖酸的作用下,烤烟体内的矿质营养得到改善,烤后烟叶的磷、钾、硼、镁、锌等矿质元素含量比对照都有所提高,腐殖酸可明显提高烤烟上等烟比例、单叶重、产量和产值,使烟叶内在化学成分更趋协调,各项品质指标更趋合理。烤烟生产中,腐殖酸最适用量为120kg/hm2。

The experiment was carried to study the effect of humic acid on photosynthetic natural capacity, quality and yield of flue-cured tobacco by utilizing the pot and field. The results indicate that humic acid can improve photosynthetic rate,the content of pigment and activity of nitrate reductase of tobacco leaves. And the improved range is successively 1.23%~20.37%,4.27~38.31%,1.98%~56.90%.Humic acid can improve the absorbing ability to mineral materials of tobacco plants. Humic acid can also raise the ratio of...

The experiment was carried to study the effect of humic acid on photosynthetic natural capacity, quality and yield of flue-cured tobacco by utilizing the pot and field. The results indicate that humic acid can improve photosynthetic rate,the content of pigment and activity of nitrate reductase of tobacco leaves. And the improved range is successively 1.23%~20.37%,4.27~38.31%,1.98%~56.90%.Humic acid can improve the absorbing ability to mineral materials of tobacco plants. Humic acid can also raise the ratio of the superior class,unit leave weight, output value and yield of cured leaves.Furthermore, the main chemical elements are better matched and all quality indexes are more reasonable of cured leaves by the treatment of humic acids. The optimum amount used in tobacco planting is 120 kg/hm~2.

采用烤烟盆栽和大田试验方法,进行了腐殖酸对烤烟生理特性和产质量影响的研究。试验结果表明,一定用量的腐殖酸能有效提高烟叶的叶绿素含量、光合强度和硝酸还原酶活性,各处理提高的幅度依次为1 23%~20 37%、4 27%~38 31%和1 98%~56 90%。施用腐殖酸能促进烟株对矿质营养的吸收。在大田生产条件下,腐殖酸在一定用量范围内,可明显提高烤烟产量、上等烟比例和单叶质量,使烟叶化学成分更趋协调,各项品质指标更趋合理。烤烟生产上腐殖酸最适用量为120kg/hm2。

 
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