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tag 标签: 土壤生态学

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土壤团聚体、胶体、粘粒、有机无机复合体等概念-----你混淆吗?
热度 2 dingfan1985 2018-12-6 16:23
土壤生态学是土壤学与生态学的交叉学科。由于不同学科学者之间理解的差异,以及对英文单词的不准确翻译,导致一些相同的概念在不同学科中代表着不同的意思,或者一些不同的概念却表示相同的意思。团队的一名博士生近来在看一些土壤胶体化学的文章,对土壤学一些概念有一些疑问。下面是我的回答。欢迎大家批评指正! 1.土壤粘粒、黏粒有何区分? 我认为:粘粒和黏粒一样,都是指土壤中小于2微米的矿质颗粒。这里的颗粒不包括有机质。测定机械组成时,需要去掉有机质,就是这个道理。 2. 土壤团聚体分级所得到的粘粒与通过超声波分散得到的粘粒有何区别?土壤有机无机复合体与这两种方法得到的粘粒有何联系? 我认为: 团聚体分级和超声波得到的 小于2微米的颗粒 不叫粘粒,应该叫粘粒大小的组分(clay sized fraction),同时包含有机物和无机物(也可以叫有机无机复合体organ-mineral assoication )。理论上说,前者( 团聚体分级所得到的粘粒 )包含一些小于2微米的微团聚体;后者( 超声波分散得到的粘粒 )是团聚体破碎后单个矿质颗粒与有机物结合形成的有机无机复合体,但实际上两者有很大的相似性,因为不能保证 超声波破碎 把所有团聚体都打碎。 3. 土壤胶体与粘粒、有机无机复合体有何联系?土壤全部是由有机无机复合体组成的么?大团聚体中是否也包含胶体? 我认为,土壤胶体应该是个很广的概念,只要它有细小的颗粒,无机和有机颗粒,有机无机复合体都可以叫胶体。土壤是由团聚体组成的,团聚体是由有机无机复合体组成的。胶体无处不在,当然也在大团聚体中。
个人分类: 研究心得|10314 次阅读|3 个评论
土壤生态学与生态土壤学(pedoecology and ecopedology)的暇想
hillside 2012-9-6 09:05
近期对生态打头的学科进行了一些思考,发现网络与知网中均无“生态土壤学”一词的存在。喜欢生造新学科名称、尤其交叉学科的我又是一阵快意。 水土气生是地球上重要的四大圈层,生态气候学、生态气象学、生态水文学均已闪亮登场。那么,生态土壤学的联想对我就在题中之义。 本人对水科学领域的有关学科领域名称务求一网打尽,尽入囊中。《水文生态学与生态水文学》(英国P J.Wood等著,中国水利水电出版社,2009)就体现了学科名称的动态与摇摆。 说是“暇想”而不是“遐想”,是因为我对土壤与生态的关系并无太多了解,比如pedoecology与soil ecology之间的异同我就不太清楚。我主要着眼于学科的角度作些宏观的推断。 中文百度与谷歌找不着“生态土壤学”之后,我自然地尝试检索pedoecology与ecopedology,结果发现,ecopedology的英文网页已有一些出现,并且有冠以ecopedology的课程出现。
个人分类: 水文科学|5595 次阅读|0 个评论
生态学图书推介(8)The Biology of Soil
lianas 2010-5-3 14:50
图书名称 The Biology of Soil - A Community and Ecosystem Approach 作者 Richard D. Bardgett 年代 Jun 2005 介绍 Description This book is unique in providing a comprehensive, up-to-date synthesis of what is known about soil biodiversity and the factors that regulate its distribution, as well as the functional significance of below-ground biodiversity for ecosystem form and function. It describes the vast diversity of biota that live in the soil environment - the most complex habitat on earth - and discusses the factors that act as determinants of this diversity across different spacial and temporal scales. The Biology of Soil also considers how biotic interactions in soil influence the important soil processes of decomposition and nutrient cycling. It demonstrates how interactions and feedbacks between diverse plant and soil communities act as important drivers of ecosystem form and function. The importance of these relationships for understanding how ecosystems respond to global change phenomena, including climate change, is discussed in depth. Much is still to be learned about the soil biota and their roles in ecosystems, and the author highlights some of the many challenges that face ecologists in the exploration of soil. Richard Bardgett has wide experience in soil and terrestrial ecology, and his background of research in many ecosystems is reflected in this book which is the most comprehensive, up-to-date volume currently available in soil ecology. It provides an introduction to the biology of soil, and it also discussed the most recent developments in this progressive field of ecology. The importance of soil biotic interactions or community and ecosystem ecology is illustrated through the use of numerous examples and case studies. The Biology of Soil provides an excellent, easy to read introduction to anyone working in the field of soil ecology and related disciplines, and will be ideal for students taking undergraduate and postgraduate courses in soil ecology, plant-soil relationships, ecosystem ecology, and land management. Features An up-to-date, comprehensive overview of the causes and consequences of biodiversity in soil, providing an accessible and authoritative summary of the field of soil ecology Provides unique combination of information on the biology of soil biota and their roles in ecosystems at different spatial and temporal scales, including wider ecological issues such as biodiversity, ecosystem functioning and global change Global case studies illustrate the importance of biotic interactions in soil for properties of different ecosystems, placing soil ecology in the context of real world issues in terrestrial community and ecosystem ecology Boxes throughout the text give background information on important soil biological properties and processes, facilitating student tuition Reviews Very well written and illustrated, and its unique approach and breadth of coverage separates it from typical soil microbiology textbooks. ... This volume deserves a place on the bookshelves of all soil scientists and soil ecologists.-- Quarterly Review of Biology 图书内容 Table of Contents 1. The Soil Environment 2. The Diversity of Life in Soil 3. Organism Interactions and Soil Processes 4. Linkages Between Plant and Soil Biological Communities 5. Above-Ground Trophic Interactions and Soil Biological Communities 6. Soil biological properties and global change 7. Conclusions Bibliography Index
个人分类: 生活点滴|3607 次阅读|0 个评论

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