土壤酸度（soil acidity）

题目

土壤酸度（soil acidity）

相似考题

1.土源性线虫(soil-transmitted nematodes)

2.According to the text．which of the following is NOT true?A．Soil forms from weathered rock on the earth surface．B．The deeper layer of soil is darker in colour than t}le surface soil．C．Air pollution is partially responsible for acid soil．D．Groundwater tends to carry away nutrients for plant growth．

3.土壤酸度按H＋存在的形式可分()和()两种基本类型。

4.根据文章，回答 67～70 问题DHave you ever noticed the colour of the water in a river or stream after a heavy rainfall? What do you think caused this change in colour? It is soil that has been washed into the river from the riverbank or from t}le nearby fields．Components of SoftSoil is made up of a number of layers(层)，each having its own distinctive colour and texture．The upper layer is known as the litter．It acts like a blanket．limiting temperature changes and reducing water loss．The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus(腐殖质)，which is black and gives the topsoil its dark colour．This layer is usually rich in nutrients，oxygen，and water．Below the topsoil is the subsoil，a layer that contains more stones mixed with only small amounts of organic matter．This layer is lighter in colour because of the lack of humus．Beneath the soil lies a layer of bedrock．Soil forms from the bottom up．Over time bedrock is attacked by rain, wind，frost, and snow．It is gradually broken down into smaller particles in a process called weathering．Plants begin to grow，and rotten materials enrich the topsoil．Most of the soil in Eastern Canada．for example．Was formed from weathered rock that was exposed when the ice disappeared l2．000 years ag0．Water Beneath the SoilSurface water collects and flows above the ground in lakes．ponds．and rivers．Once in the soil or rock，it is called groundwater．Gravity pulls groundwater through the soil in a process called percolation(渗透)．Eventually the water reaches a layer called the water table．Under this is bedrock through which water cannot percolate．As water percolates downward，it dissolves organic matter and minerals from the soil and carries them to deeper layers．This causes a serious problem because plants require these nutrients for growth.Soil pHSoil can be acidic．neutral．or basic．The pH of the soil is determined by the nature of the rock．from which it was formed．and by the nature of t}le plants that grow and rot in it．The acidity of rain and snow can lower the pH of the groundwater that enters the soil．By burning fossil fuels such as coal，oil and gasoline，humans have been contributing to higher levels of acidity in many soils．When fossil fuels are burned．gases are released into the air and then fall back to earth as acid rain．Acid soil increases出e problem of carrying nutrients to lower soil levels．As nutrients are removed，soil is less fertile．Plants grow more slowly in acidic soil，and also become easily attacked by diseases．第12题：The layer of soil that provides necessary nutrients for plant growth is called．A．1itterB．topsoilC．humusD．subsoil

更多“土壤酸度（soil acidity）”相关问题

  • 第1题：

    what chemicals did you use to treat the boiler water ?when you test alkalinity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .


    正确答案：I have ever used the following brand chemicals :unitor , drew and so on . We should keep the boiler water’s ph scale between 10.5 and 11.5 . If the water become of acidity ( ph scale is below 10 ) ,it is may be caused by following reasons : The water has not been given enough blow down ,or has not been filled enough alkalinity chemicals

  • 第2题：

    下列肥料可以降低土壤酸度的是（）

    • A、钾肥
    • B、钙肥
    • C、镁肥
    • D、硫肥

    正确答案:B

  • 第3题：

    土层（soil horizon）


    正确答案: 成土过程对疏松物质的改造作用，特别是腐殖质的形成和加入过程，以及颗粒与溶解物质的转移过程，导致土壤内部沿垂直方向发生分异，形成了一些物理和化学性质明显不同的水平层次，称为土层（soil horizon）。

  • 第4题：

    土壤酸度可分为活性酸度和（）两个基本类型。


    正确答案:潜在酸度

  • 第5题：

    简述土壤酸度对林木的影响？


    正确答案: （1）性或碱性环境直接伤害林木组织。
    （2）响养分的有效性和微生物活动，间接影响林木生长。

  • 第6题：

    什么是土壤酸度？其包括哪两种类型，其作用机理如何？


    正确答案: 土壤酸度是指土壤来中和OH-的能力，包括活性酸度，和潜性酸度。土壤活性酸度，是指土壤溶液中的氢离子浓度。而指由土壤胶体上吸附的氢离子、铝离子和羟基离子所可能产生的酸度。

  • 第7题：

    土壤环流术 soil perfusion technique


    正确答案: 能使水分或营养液在土柱中不断循环流过以达到生物和生物化学作用不断进行的装置和技术。

  • 第8题：

    土壤－根界面 soil-root interface


    正确答案: 土壤和根系交界的部位。

  • 第9题：

    问答题
    茶树对土壤酸度的要求？茶树喜酸的原因是什么？

    正确答案： ①茶树的遗传性所决定。
    ②茶根汁液的缓冲能力在pH5.0时最高，这也是由于茶树长期生长在有效磷含量极低的红壤中，因而造成了根中含磷量较低，借以适应红壤的环境。
    ③茶树菌根需要在酸性环境中才能生长和侵染与茶树根系共生互利。
    ④茶树需要土壤提供大量的可给态铝。在pH>5.5时，代换性Al3+的含量便很低以致不存在。
    ⑤茶树是嫌钙植物。
    解析： 暂无解析

  • 第10题：

    问答题
    简述影响土壤酸度的因素？

    正确答案： 母岩、降水、地形、植被等。
    例如湿润地区多数森林土壤呈微酸性反应，沼泽土酸性较强，干旱地区的盐碱土为碱性。针叶林下的土壤常呈酸性反应。
    解析： 暂无解析

  • 第11题：

    单选题
    A

    To transport water to high places.

    B

    To provide air conditioning.

    C

    To fertilize the soil.

    D

    To adjust the soil temperature.


    正确答案： D
    解析：
    [考点]推断题。录音指出，他们把管子插进土壤中，这样冷水就会降低土壤温度，选项D与此句同义替换。

  • 第12题：

    According to the text. which of the following is NOT true?

    A. Soil forms from weathered rock on the earth surface.

    B. The deeper layer of soil is darker in colour than the surface soil.

    C. Air pollution is partially responsible for acid soil.

    D. Groundwater tends to carry away nutrients for plant growth.


    正确答案：B

  • 第13题：

    土壤酸度按氢离子的存在方式可以分为（）两种。


    正确答案:活性酸和潜性酸

  • 第14题：

    土壤酸度分为哪些类型？各类型之间的关系如何？


    正确答案: （1）活性酸度，也称有效酸度，是土壤溶液中游离H+形成通常用pH表示。
    （2）潜在酸度，是土壤胶体所吸附的H+和Al3+所引起的。
    土壤中的活性酸和潜性酸，是同属于一个平衡系中的两种酸度。
    土壤酸度的产生，必先起始于土壤溶液中活性氢离子的存在，也就是说，土壤活性酸是土壤酸度的根本起点。

  • 第15题：

    简述影响土壤酸度的因素？


    正确答案: 母岩、降水、地形、植被等。
    例如湿润地区多数森林土壤呈微酸性反应，沼泽土酸性较强，干旱地区的盐碱土为碱性。针叶林下的土壤常呈酸性反应。

  • 第16题：

    土壤酸度类型有哪些？


    正确答案: （1）活性酸
    （2）潜性酸  交换性酸和水解性酸

  • 第17题：

    土壤多糖 soil polysaccharide


    正确答案: 土壤中由10个以上单糖及其衍生物通过糖苷缩聚而形成的化合物。

  • 第18题：

    干土效应 effect of soil drying


    正确答案: 土壤经干燥后，在加水湿润的最初1~2周内，二氧化碳和氨态氮释放量增多的现象。

  • 第19题：

    填空题
    土壤酸度分为（）和（）两种。

    正确答案： 活性酸度,潜在酸度
    解析： 暂无解析

  • 第20题：

    单选题
    Why does land become desert after all trees are cut down?
    A

    Because nothing remains on land except floods.

    B

    Because there are no longer trees to keep the rain and protect the top-soil.

    C

    Because too much rain sinks in and washes away the top-soil.

    D

    Because roots of the trees break up the soil.


    正确答案： C
    解析：
    推理题。第三段最后一句指出“When all the top-soil is gone, nothing remains but worthless desert.”表层土壤流失导致了沙漠化，而树木是可以防止水土流失的。

  • 第21题：

    单选题
    A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
    A

    slight acidity

    B

    slight alkalinity

    C

    excessive alkalinity

    D

    excessive acidity


    正确答案： D
    解析： 暂无解析

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