Contents
	Summary	974
I.	Introduction: continuing to face up to root ecology's challenges	975
II.	Semantics: defining concepts for better understanding and communication	977
III.	Species‐level vs ecosystem‐level measurements	978
IV.	Below‐ground plant entities and root classifications	979
V.	Contextualisation and reuse of data	988
VI.	Experimentation and sampling in laboratory and field	989
VII.	Root washing, sorting and storage	1001
VIII.	Horizontal plant mobility	1004
IX.	Below‐ground allocation	1007
X.	Root system architecture	1013
XI.	Root spatial distribution	1017
XII.	Root morphology	1021
XIII.	Root anatomy	1028
XIV.	Root chemistry	1037
XV.	Root mechanics	1046
XVI.	Root dynamics	1050
XVII.	Root respiration and exudation	1056
XVIII.	Physiology of resource uptake	1063
XIX.	Mycorrhizal associations	1070
XX.	Nitrogen‐fixing symbioses	1075
XXI.	Root tip morphology and elongation	1080
XXII.	Root hair morphology and development	1084
XXIII.	Root decomposition	1090
	Acknowledgements	1094
	References	1095