土壤微生物

In this paper,researching progress of allelopathic autotoxicity in agro-ecosystem was briefly reviewed based on many studies collected,including allelochemicals,factors of allelopathy ,mechanism of allelopathy .

本文对化感作用的本质和影响因素，化感中自毒作用对作物连作的影响进行了阐释与介绍，在此基础上综述了植物化感自毒作用与土壤病虫害发生、土壤微生物之间的关系，并对化感及自毒作用在农业生态系统中的应用和前景进行了展望。

The growth of laminae of Carex meyeriana showed a single peak curve and daily quantity of assimilation was much higher.

乌拉苔草沼泽湿地的生物过程着重探讨生物量、土壤微生物及土壤酶活性。

The effect of drought stress on the microbes of red soil in Chamaecrista rotundifolia stand was studied by pot culture experiment.

通过圆叶决明盆栽试验，研究了土壤干旱胁迫对红壤土中土壤微生物的影响。

VA fungus is one of the most important kinds of edaphon in agriculture biogeocenose ,which appears abroad in the soil.

一VA菌根菌是农业生态系统中一类重要的土壤微生物，在农田土壤中广泛存在。

As the result showed: Compared to American Ginsengs growing in different years, the result showed that the amount of edaphon in American Ginsengs' rhizosphere became larger and the soil physcial and chemical properties changed in different degree .

结果显示：通过对不同生长年限的比较，西洋参根际土壤微生物有总体水平看，均有所增长，土壤理化性质也有不同程度的改变。

The mount of germ and fungus quantity in soil are remarkably increased for the continuous cropping about 5 years, puts the trichobacteria quantity always change tendency to reduce;The edaphon total quantity, the bacterium quantity change reduces generally above the continuous cropping 5 years and below 5 years (including 5 years) the change are not obvious;In the nitrogen physiology group by ammoniates the bacterium primarily and the quantity changes are not very big;The nitrifying bacteria quantity is lower than the comparison (non- continuous cropping), the quantity of denitrifying bacteria is opposite;The alkalinity phosphatase, the urease, invertin activeness have a closed relations with the continuous cropping when it will increase less than 5 years or decrease in more than 5 years. The relation between catalase activeness and the continuous cropping is not very big. The reduction of the invertin activeness, the alkalinity phosphatase, urease activeness have slightly elevates, catalase activeness have no the regular changes.

表现为连作条件下土壤真菌数量显著增大，放线菌数量总的变化趋势降低；土壤微生物总量、细菌数量变化在连作5年以上普遍降低，5年以下(包括5年)则变化差异不明显；氮素生理群中以氨化细菌为主，但数量变化不大；硝化细菌数量低于对照组，反硝化细菌数量则相反：多酚氧化酶、转化酶活性在5年之前逐渐上升，5年之后逐渐下降，，脲酶活性随着连作年限增加持续上升，过氧化氢酶活性、碱性磷酸酶活性变化无规律。

We indicated from our test that the treatment concentration of 50 mg· L- 1 and exporsure time with 4h by the herbicide were believed to be the threshold concentration and threshold time for causing abnormal cell mitosis in Secale cereale and Hordeum vulgar, respectively.

人们对它的作用机理和作用部位[2]、它在土壤中吸收和降解[4]以及草甘磷对土壤微生物群落的影响作过一定的研究[5]，并已开始抗草甘磷转基

This paper reports the effect of added copper on microbial population in lateritic rice soil.

重金属元素对土壤微生物的作用，国内外已进行了不少研究，国内在这方面的研究则主要体现于&六五&和&七五&攻关项目中的土壤环境容量研究。

Melongena as scion, this paper studied the verticillium-resistance of grafted eggplant and its relationships with the variations of microbial populations and enzyme activities in rhizosphere soil.

surattense为砧木，西安绿茄(S 。melongena)为接穗，研究了嫁接茄的抗黄萎病效果及其根际土壤微生物种群数量和酶活性变化，探讨了嫁接茄的抗病性与根际土壤生物学活性的关系。

There was an interaction between soil and plant on the diversity of soil microbial community.

对土壤微生物群落结构和功能的研究一直以来是土壤生态学研究的一个热点。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐