1 Weisel Y, Eshel A, Kafkafi U. Plant Roots: The Hidden Half. 3rd ed. New York: Marcel Dekker Press, 2002. 15-32
[2]
2 Dixon R K, Brown S, Houghton R A, et al. Carbon pools and flux of global forest ecosystems. Science, 1994, 263: 185-190??
[3]
3 Jackson R B, Canadell J, Ehleringer J R, et al. A global analysis of root distributions for terrestrial biomass. Oecologia, 1996, 108: 389-411??
[4]
4 Gregory P J, Hutchison D J, Read D B, et al. Non-invasive imaging of roots with high-resolution X-ray micro-tomography. Plant Soil, 2003, 187: 221-228
[5]
5 Stover D B, Day F P, Butnor J R, et al. Effect of elevated Co2 on coarse-root biomass in Florida scrub detected by ground-penetrating radar. Ecology, 2007, 88: 1328-1334??
[6]
6 Mulkey S S, Chazdon R L, Smith A P, et al. Tropical Forest Plant Ecophysiology. New York: Chapman and Hall Press, 1996. 268-300
[7]
7 Brunner I, Godbold D L. Tree roots in a changing world. J For Res, 2007, 12: 78-82??
[8]
8 Persson H. Spatial distribution of fine root growth, mortality and decomposition in a young scots pine stand in central Sweden. Oikos, 1980, 34: 77-87 ??
[9]
9 Norby R J, Jackson R B. Root dynamics and global change: Seeking an ecosystem perspective. New Phytol, 2000, 147: 3-12??
[10]
10 Pierret A, Moran C J, Doussan C. Conventional detection methodology is limiting our ability to understand the roles and functions of fine roots. New Phytol, 2005, 166: 967-980??
[11]
11 Nadezhdina N, Cermak J. Instrumental methods for studies of structure and function of root systems of large trees. J Exp Bot, 2003, 54: 1511-1521??
[12]
12 Sustek S, Hruska J, Druckmuller M, et al. Root surfaces in the large oak tree estimated by image analysis of the map obtained by the ground penetrating radar. J For Sci, 1999, 45: 139-143
[13]
13 Amato M, Basso B, Celano G, et al. In situ detection of tree root distribution and biomass by multi-electrode resistivity imaging. Tree Physiol, 2008, 28: 1441-1448
[14]
14 Danjon F, Reubens B. Assessing and analyzing 3D architecture of woody root systems, a review of methods and applications in tree and soil stability, resource acquisition and allocation. Plant Soil, 2008, 303: 1-34 ??
[15]
15 Hruska J, èermák J, Sustek S. Mapping tree root systems with ground-penetrating radar. Tree Physiol, 1999, 19: 125-130
[16]
16 Stokes A, Fourcaud T, Hruska J, et al. An evaluation of different methods to investigate root system architecture of urban trees in situ: 1. Ground penetrating radar. Arboriculture J, 2002, 28: 2-9
[17]
17 Cermak J, Hruska J, Martinkova M, et al. Urban tree root systems and their survival near houses analyzed using ground penetrating radar and sap flow techniques. Plant Soil, 2000, 219: 103-116??
[18]
18 Wielopolski L, Hendrey G, McGuigan M. Imaging tree root systems in situ. The 8th International Conference on Ground-Penetrating Radar, May 23 to 26, 2000, Gold Coast, Queensland, Australia. 642-646
[19]
33 Daniels D J. Surface-penetrating radar. London: The Institute of Electrical Engineers, 1996. 300
[20]
19 Butnor J R, Doolittle J A, Kress L, et al. Use of ground-penetrating radar to study tree roots in the southeastern United States. Tree Physiol , 2001, 21: 1269-1278
[21]
20 Barton C V M, Montagu K D. Detection and determination of root diameter by ground- penetrating radar under optimal conditions. Tree Physiol, 2004, 24: 1323-1331
[22]
21 Butnor J R, Doolittle J A, Johnsen K H, et al. Utility of ground-penetrating radar as a root biomass survey tool in forest systems. Soil Sci Soc Am J, 2003, 67: 1607-1615??
[23]
22 Butnor J R, Johnsen K. Feasibility of using ground-penetrating radar to quantify root mass in Florida''s intensively managed pine plantations. Forest Biology Research Cooperative Report Number 38. Gainesville, Florida, USA, 2005
[24]
23 Stover D B, Day F P, Butnor J R, et al. Effect of elevated CO2 on coarse-root biomass in Florida scrub detected by ground-penetrating radar. Ecology, 2007, 88: 1328-1334??
[25]
24 Hirano Y, Dannoura M, Aono K, et al. Limiting factors in the detection of tree roots using ground-penetrating radar. Plant Soil, 2009, 319: 15-24??