A. Background and scope of the study ...3 1. General ..." ,-, ...11 B. Abandoned and marginal agricultural grasslands ...5 2. Some equilibrium models explaining species di- 1. Definition ...5 versity ., ..., ,-..., ...11 2. Inland areas in western Europe ...6 3. Change of the steady state .. , .. , ...14 3. Ca. stal areas in western Europe ...8 4. Dispersal of plant species ..., ,- 14 C. Nature mc.nagement practices ...10 5. 'Ecotypic' diversity .. , ...15 D. Theoretical considerations on nature management 6. Patterns in plant communities ...15 with special reference to diversity ...7...,. 11 Implications for management 16 LA. Background and scope of the study (Klapp, 1965), Belgium (Van Hecke, Impens & Behaeghe, 1981) and the Netherlands (Oomes & The degradation of flora and vegetation in natural Mooi, 1981; Elberse, Van Den Bergh & Dirven, and semi-natural landscapes has become a matter 1983; Willems, 1983A).

This book is the self-contained sixth volume of a comprehensive series on nitrogen fixation. It presents the state-of-the-art in regards to actinorhizal symbioses. Like legumes, actinorhizal plants form root nodules that host nitrogen-fixing soil bacteria. However, because the macrosymbionts are, with one exception, woody plants rather than crop plants, actinorhizal symbioses are less well-known than legume symbioses to which they are phylogenetically related. Actinorhizal plants come from eight different families. They can grow on marginal soils by virtue of these symbioses and are used extensively in reforestation, soil reclamation, and desert agroforestry. The diversity of the involved host plants poses a variety of challenges to the actinorhizal symbiosis and results in interesting strategies, for example, to cope with the O2 dilemma or nutrient exchange between plant and bacterium. The actinorhizal micro-symbionts are Gram-positive actinomycetes of the genus Frankia...

With one volume each year, this series keeps scientists and advanced students informed of the latest developments and results in all areas of the plant sciences. The present volume includes reviews on genetics, cell biology, and vegetation science.

Life originated and evolved in water. Later the The tropical countries where the need to under plants moved out of water, conquered the land and stand the natural ecosystems is far greater because became dominant over it. The evolution through they are under intensive pressure from develop the millennia resulted in enormous complexity of ment from a rapidly growing human population, form, tissue organisation, reproductive mechan have generally devoted much less attention to the isms and specialisation of taxa in different niches. studies of aquatic ecosystems. The Indian subconti At some stage during evolution, some plants devel nent is a well-recognised biogeographic region with oped appropriate morphological and physiological a distinct geological history, climate, soils and adaptations and reverted back to the aquatic and/ biota. It is also distinct in the history of human civilisation and cultures which have a profound bear or semi-aquatic habitat. These plants, perhaps with the exception of a few ing on the natural ecosystems. This book is in with beautiful flowers, have attracted little atten tended to provide the state of our knowledge of the tion from mankind. The fact that humans evolved aquatic and semi-aquatic vegetation in the inland in a tropical forest or savanna environment appears freshwaters of the subcontinent. The book covers responsible for a permanent bias in human atti only the herbaceous vegetation, since there is al tudes towards land and its biota."

Unmanned Aerial Systems for Monitoring Soil, Vegetation, and Riverine Environments provides an overview of how unmanned aerial systems have revolutionized our capability to monitor river systems, soil characteristics, and related processes at unparalleled spatio-temporal resolutions. This capability has enabled enhancements in our capacity to describe water cycle and hydrological processes. The book includes guidelines, technical advice, and practical experience to support practitioners and scientists in increasing the efficiency of monitoring with the help of UAS. The book contains field survey datasets to use as practical exercises, allowing proposed techniques and methods to be applied to real world case studies.

Genome Mapping and Molecular Breeding in Plants presents the current status of the elucidation and improvement of plant genomes of economic interest. The focus is on genetic and physical mapping, positioning, cloning, monitoring of desirable genes by molecular breeding and the most recent advances in genomics. The series comprises seven volumes: Cereals and Millets; Oilseeds; Pulses, Sugar and Tuber Crops; Fruits and Nuts; Vegetables; Technical Crops; and Forest Trees.

Forest trees cover one third of the global land surface, constitute many ecosystems and play a pivotal role in the world economy. Despite their importance in the economy, ecology and environment, genetic analysis and breeding efforts have lagged behind. Presented here are chapters on Populus trees, pines, Fagaceae trees, eucalypts, spruces, Douglas fir and black walnut, and a first-ever detailed review of Cryptomeria japonica. Innovative strategies to address the inherent problems of genome analysis of tree species are thoroughly discussed.

This book presents, in 26 chapters, the status quo in epigenomic profiling. It discusses how functional information can be indirectly inferred and describes the new approaches that promise functional answers, collectively referred to as epigenome editing. It highlights the latest important advances in our understanding of the functions of plant epigenomics and new technologies for the study of epigenomic marks and mechanisms in plants. Topics include the deposition or removal of chromatin modifications and histone variants, the role of epigenetics in development and response to environmental signals, natural variation and ecology, as well as applications for epigenetics in crop improvement. Discussing areas ranging from the complex regulation of stress and heterosis to the precise mechanisms of DNA and histone modifications, it presents breakthroughs in our understanding of complex phenotypic phenomena.

Vegetables contain several classes of pigments: the green chlorophylls; the yellow, orange, and red carotenoids; the red, blue, or violet anthocyanins; andthered-violet betalains. Thisbookcoversthechlorophyllsandthecarot- enoids, the two chief classes of vegetable pigments, and is the first major compilationofthis kind. Structure, physical and chemical properties, and analytical methods, in- cluding special methods adapted for certain vegetables, are discussed first, and are then followed by a discussion of physiological and biochemical as- pects, including location, biosynthesis, and biochemical changes during plant developmentand senescence. Both pigment classes have extremelyimportant biological functions. The chlorophylls are of paramount importance in photosynthesis. The carot- enoids, besides their photofunction, have a highly significant role in nutri- tion. Someofthem havevitaminA value and, possibly, a rolein the preven- tion of human cancer. The chlorophyll distribution table includes all ofthe currentlyavailable quantitativedataonvegetables. The discussion of carotenoid distribution describes the unique carot- enoids found invegetablesandincludesqualitativeandquantitativedistribu- tion tables for the most common vegetables. These tables summarize all of the publisheddata to date, but they are far from complete. However, appli- cationofrecentlyavailabletechniques should fill theenormousgaps, update old data, and permit an accurate assessment of the vitamin A value of the food. Suchcompletedatawould also make it possible to usecarotenoid dis- tributioninthetaxonomyofvegetables. The presentations of pigment distribution also consider the changes in pigmentcontentduring storageand processing. Thebookalsoincludesapresentationoffactors affectingpigmentsynthe- sis in vegetables (e.g., phytohormones) and environmental factors (e.g., light, temperature), as well as fertilizers and pesticides.

In continuation from the previous three volumes 17, 18, and 19 on High-Tech and Micropropagation this volume presents 29 chapters on the propagation of ornamental plants through modern biotechnological methods. The species covered include "Alstromeria," "Antirrhinum," "Begonia," "Chrysanthemum," "Cornus," "Euphorbia," "Gardenia," "Gladiolus," "Hyacinthus," "Impatiens," "Iris," "Lycoris," "Nematanthus," "Paeonia," "Pelargonium," "Phalaenopsis," "Rhododendron," "Ruscus," "Saintpaulia," "Senecio," "Syringa," orchids, cacti, roses, and Boston ferns. In addition, one chapter is devoted to micropropagation of virus-free ornamentals in the CIS. Throughout the book, detailed protocols as well as a comprehensive review of the literature are provided. Advanced students, teachers, and researchers in the fields of floriculture, horticulture, and plant biotechnology in general, and also those interested in industrial or commercial micropropagation will find a wealth of useful information in the book.

Plants produce more than 30,000 types of chemicals, including pharmaceuticals, pigments and other fine chemicals, which is four times more than those obtain ed from microbes. Plant cell culture has been receiving great attention as an alternative for the production of valuable plant derived secondary metabolites, since it has many advantages over whole plant cultivation. However, much more research is required to enhance the culture productivity and reduce the pro cessing costs, which is the key to the commercialization of plant cell culture pro cesses. The recent achievements in related biochemical engineering studies are reviewed in Chapter 1. The effect of gaseous compounds on plant cell behavior has been little studied, and Chapter 2 focuses on these gas concentration effects (including oxygen, carbon dioxide, ethylene and others, such as volatile hor mones like methyl jasmonate) on secondary metabolite production by plant cell cultures. Two metabolites of current interest, i. e. , the antimalarial artemisinin (known as "qing hao su" in China) that is produced by Artemisia annua (sweet wormwood) and taxanes used for anticancer therapy that are produced by species of Taxus, are taken as examples. Bioprocess integration is another hot topic in plant cell culture technology. Because most of the plant secondary meta bolites are toxic to the cells at high concentrations during the culture, removal of the product in situ during the culture can lead to the enhanced productivity. Various integrated bioprocessing techniques are discussed in Chapter 3.

In hierdie verbeterde, uitgebreide en aangepaste uitgawe van Algemende Plantkunde is die benadering steeds om basiese plantkunde, die vakwetenskap wat oor plante handel, aan studente bekend te stel. Die boek bied aan studente op voorgraadse vlak 'n waardevolle biologies-wetenskaplike basis. Die skrywers, onder leiding van HP van der Schijff, is gemoeid met die bekende, byna klassieke, maar tog moderne vorm van plantkunde om sodoende die hedendaagse student en navorser tot diens te wees, en aan hom/haar 'n onderbou te gee in die werklikheid van vorm, bou , funksie en voortplanting van die plante waarmee hy/sy werk.

Presenting the state of the art of tissue culture and in vitro propagation of vegetable and tuber crops, medicinal and aromatic plants, fibre and oilseed crops, and grasses, this book complements the previous two volumes on High-Tech and Micropropagation, which concentrated on special techniques (Vol.17) and trees and bushes of commercial value (Vol.18). The specific plants covered here include asparagus, lettuce, horse radish, cucumber, potato, cassava, sweet potato, artichoke, yams, cardamom, fennel, celery, thyme, leek, mentha, turmeric, lavender, agave, yucca, cotton, jute, sunflower, ryegrass, zoysiagrass, and various species of "Aconitum," "Artemisia," "Camelia," "Centaurium," "Digitalis," "Dioscorea," "Glehnia," "Levisticum," "Parthenium," and "Pinella." The book is of use to advanced students, teachers and research workers in the field of pharmacy, horticulture, plant breeding and plant biotechnology in general, and also to individuals interested in industrial micropropagation.

This manual is a new guide to the 383 native and naturalized species of trees, shrubs, and woody vines found in northern Florida and adjacent Georgia and Alabama.

In this complete and authoritative work, Robert K. Godfrey provides identification keys, full descriptions, and line drawings that make it possible to identify all the woody flora in the area described. Casual observers of the lower coastal plain, which encompasses the region covered in this volume, may at first see a landscape dominated by pines. Closer observation, however, reveals a great diversity of plants--patterns of contrasting vegetation caused by the complex physical and biotic factors at work. In this richly vegetated area, a rise of only four feet in elevation can bring significant changes in community composition, changes comparable, perhaps, to those occurring on a four-thousand-foot mountainside.

The descriptions in Godfrey's manual are useful not only for identification purposes but also for their help in enhancing the user's knowledge of the plants. Each description is followed by information on the habitat in which the species is known to occur, the species' general location within the area under study, and its overall geographic range. Whenever possible, vegetative characteristics have been used in the keys so that the book is useful beyond the sometimes brief flowering seasons of the species. The use of technical terminology has been minimized in the keys and descriptions, and a full glossary is provided.

Based on thirty years of constant study and firsthand observation, Robert K. Godfrey's manual will become the definitive work on this area's notably diverse woody flora, from the common longleaf pine ("Pinus palustris") and Jackson-brier ("Smilax smallii") to locally rarer species such as the fragrant sumac ("Rhus aromatica"), Spanish bayonet ("Yucca gloriosa"), and ornamental Chinese tallow-tree ("Sapium sebiferum").

This volume provides detailed techniques used for the study and characterization of the plant vascular system, with a central focus on the xylem tissue. Chapters are organized in three main sections covering; analysis of xylem development, xylem characterization though imaging techniques, and analysis of the xylem composition. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and practical Xylem: Methods and Protocols, aims to ensure successful results in the further study of this vital field.

This book outlines the transitions between cultured and natural land cover/vegetation types and their implications in the search for alternatives to reverse the trend of anthropogenic environmental degradation. It also elaborates on the proposed "standardized hierarchical Mexican vegetation classification system" and geobotanical mapping, a critical transversal environmental issue. The first chapter consists of an historical review of the common approaches to the study of vegetation both in Mexico and in other regions of the world. The second chapter concisely analyzes the existing schools of thought that have led to the development of vegetation classification systems based on physiognomic, structural and floristic approaches. The focal point of the book is the "standardized hierarchical Mexican vegetation classification system" (SECLAVEMEX - "Sistema jerarquico estandarizado para la clasificacion de la vegetacion de Mexico"). Chapter 3 describes the system's organizational levels along with the criteria defining them and the nomenclatural basis for the denomination of each type of vegetation. It also includes a series of tables explaining and precisely defining the meaning of each concept, criterion, character and element used to help readers successfully identify the type of vegetation in a determined area. The fourth chapter highlights SECLAVEMEX's inclusive character as evidenced through its compatibility with other systems currently used around the globe. Three concepts are critically reviewed: land cover, land use and vegetation. These are often the study subject of the contrasting disciplines geography, agronomy and ecology, which all rely upon plant species assemblages. As such, the final chapter focuses on a critical transversal environmental issue - geobotanical mapping. Geobotanical mapping offers a baseline for land cover/use planning and provides critical information on ecological, economic and cultural attributes, which can be used as a basis for environmental-policy decisions. The proposed SECLAVEMEX was applied to Mexico as an example of land cover, land use and vegetation patterns intermingling as the result of a long human influence. SECLAVEMEX, however, can be adapted and hopefully adopted globally as a baseline for consistently comparing geobotanical patterns and their transitions.

Biofuels and Rural Poverty makes an original contribution to the current controversial global debate on biofuels, in particular the consequences that large-scale production of transport fuel substitutes can have on rural areas, principally in developing countries but also in some poor rural areas of developed countries.

Three key concerns are examined from a North-South perspective: ecological issues (related to land use and biodiversity), pro-poor policies (related to food and land security, gender and income generation) and equity of benefits within the global value chain. Can biofuels be pro-poor? Can smallholder farmers be equitably integrated in the biofuels global supply chain? Is the biofuels production chain detrimental to biodiversity?

Most other books available on biofuels take a technical approach and are aimed at addressing energy security or climate change issues. This title focuses on the socio-economic impacts on rural people's livelihoods, offering a unique perspective on the potential role of biofuels in reducing rural poverty.

This volume covers a range of methods used in plant cytogenetics, beginning with basic analysis of chromosomes and visualizing gene locations, to manipulating and dissecting chromosomes, and then focusing on less understood features of chromosomes such as recombination initiation sites and epigenomic marks. The methods described in Plant Cytogenetics: Methods and Protocols build on each other and provide, those new to the field, with a comprehensive platform to support their research endeavours, while also introducing advanced techniques to experienced researchers. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Cutting edge and thorough, Plant Cytogenetics: Methods and Protocols, is a valuable resource for anyone who is interested in the diverse and wonderfully complex field of cytogenetics.

Plant Stress Mitigators: Types, Techniques and Functions presents a detailed contextual discussion of various stressors on plant health and yield, with accompanying insights into options for limiting impacts using chemical elicitors, bio-stimulants, breeding techniques and agronomical techniques such as seed priming, cold plasma treatment, and nanotechnology, amongst others. The book explores the various action mechanisms for enhancing plant growth and stress tolerance capacity, including nutrient solubilizing and mobilizing, biocontrol activity against plant pathogens, phytohormone production, soil conditioners, and many more unrevealed mechanisms. This book combines research, methods, opinion, perspectives and reviews, dissecting the stress alleviation action of different plant stress mitigators on crops grown under optimal and sub-optimal growing conditions (abiotic and biotic stresses).