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[资源] 【分享】Trees, Crops, and Soil Fertility Concepts and Research Methods

Foreword
Soil science benefits from the availability of a wide array of practicable
methods. There are a number of very useful compendia in which sets of
these methods are collected together to provide easy reference for the
intending  practitioner.  The  need  for  yet  another  handbook  might
therefore be questioned. This book, however, fulfils several needs that are
not met in previous volumes.
First and foremost it is unique in its format and purpose – being not a
compendium of protocols but a reasoned discussion of the value and utility
of different methods. Major advances in science are dependent on, and
sometimes even driven by, the availability of suitable methods by which key
questions or hypotheses may be answered. Progress may be said to be a
product  of  the  match  between  developments  in  concept  and  those  in
technique. The structure and content of this book are designed to review
the ways in which current thinking in terms of the major problems of soil
fertility can be methodologically attacked. As such the book should be useful
not only in helping to solve problems but also in provoking new questions.
The  book  is  written  within  a  particular  context  –  soil  fertility
development under agroforestry. At first this may seem very specific and
thus limited in appeal and application. But over the last decade or so
agroforestry research has been one of the most influential in developing
new insights into soil biology and fertility and thus provides a very suitable
framework for review of progress. Furthermore, the influence of trees on
soil is profound and of significance beyond agroforestry systems, so the
book is likely to be of interest in the wider spheres of agriculture, forestry
and ecological sciences.
The book covers a spectrum of soil methods broader than most soil
science handbooks, combining the techniques of soil chemistry and physics
with a wide scope of biological approaches and aspects of social science.
This is reflective of the ways in which soil research has moved beyond its
strict reductionist paradigm to embrace a more holistic and ecosystematic
approach.
The book comes at an appropriate time to review the progress of both
concept and method in the slow march towards an integrated approach
to land management. It should not only serve the purpose of directing
enquiring researchers towards the useful approaches but also act as a
stimulus for the next wave of soil fertility research.
                                                      Mike Swift
                                                TSBF, Nairobi, Kenya

Download link：http://www.isload.com.cn/store/bo4avfghdg48k

[ Last edited by ewigkeit on 2008-11-29 at 13:04 ]

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