土壤发生

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。

When the cultures of Trichoderma isolates which possess the stronger antagonistic ability to S.sclerotiorum are introduced into the soil, the sclerotia burried in this soil is to decay six months later, the carpogenic germination of sclerotia that has not decayed reduces sharply.

将拮抗作用强的木霉菌株培养物导入土壤后，埋入土壤中的菌核多数将发生腐烂，即使未腐烂的菌核其产子囊盘萌发能力也大大降低。

And soil structure was destroyed and formed erodible particles with size 0.154 to 0.18 mm in the soil surface under the trampling of livestock.

在牲畜的践踏作用下，表层土壤破碎粒子直径主要位于0.154~0.18 mm之间，在风力作用下土壤表面发生风蚀。

The seasonally alternative distribution of wind and rainfall provides energy for soil erosion and loose underlying material, erodible soil types and landform also provide the material basis for desertification.

而河湖积和风积的松散土壤下覆物质和地形地貌及土壤特征都为荒漠化的发生和发展提供了物质基础。

Aiming at the spatial complexity and genesic repeatability of soil salinization in Lower Yellow River Delta, with the application of electromagnetic induction EM38 and its mobile sensing system, spatio-temporal variation of soil salinity in typical field of this region during two critical seasons was analyzed by using GIS and geostatistics method.

针对黄河下游三角洲土壤盐渍化的空间复杂性与发生反复性，运用磁感式大地电导率仪EM38及其移动测定系统，结合GIS与地统计学方法，对该地区典型地块两个关键季节土壤盐分的时空变异特征进行了分析。

Somewhat the typical xeromophic structure of leaf became light mesophytic in nature.

污水排放不会改变土壤质地，对土壤pH、全盐量和有机质含量影响不显著；但导致根中形成层层数和木质部束数减少，而根系活力未受抑制，胚轴和茎的结构未发生变化，在一定程度上却使叶片典型的早生性质变得不强烈。

They have several meters of paleosol developed on the top of overbank silt, suggesting that the abandonment of each terrace due to river incision occurs during the transition from glacial to interglacial climates and there may be a link between the production of terraces and glacial-interglacial climatic cycles. However, it is not every glacial-interglacial transition during the last 1,240ka that terrace can form and preserve.

黄河各阶地河漫滩顶部都有一层古土壤发育表明黄河下切形成阶地发生在古土壤开始发育的冰期向间冰期的过度阶段，但是并非1，240ka以来的每次冰期—间冰期的气候交替都能引起黄河下切形成阶地。

The petrolic substance, which penetrates into the soil with a lot of physical, chemical and biochemical function, will seriously pollute the water system of the soil.

这些石油类物质进入土壤环境后，会发生许多物理、化学和生化作用，造成土壤水环境系统的严重污染。

Vegetation restoration also resulted in the changes of soil physicochemistry properties including the significant increase in contents of organic matter, total nitrogen, available potassium, fine sand, very fine sand and clay, and the decrease in available nitrogen, phosphorus.

植被的恢复使土壤理化性质发生了变化，与封育前相比土壤中有机质、全N、速效K以及细砂、特别细砂和粘粒含量显著增加；速效N、速效P降低。

But as the special geological condition,irrigation causes a series of problems of agroecological geology,such as landslide,salination and so on.

长时期的引水灌溉使土壤理化性质发生改变，并由此引发了地裂缝、滑坡等地质灾害，同时地下水水位的上升，使地表土壤盐渍严重。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失