drivers of soil respiration of root and microbial ... - Unitus DSpace

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Acknowledgements This work was possible to realize thanks to the help and support of many people to whom I’ m very grateful. I wish to thank in particularly My supervisor Prof. Riccardo Valentini for the opportunity to conduct this study, for his loyalty, provided freedom and support in realization almost any idea. Prof. Paolo De Angelis for his careful assistance as a coordinator of the PhD course. Dr. M. Cristina Moscatelli for her incredible sustain, attention and help performing soil biochemical analyses and data elaboration. Prof. Yakov Kuzyakov who involved me to the fascinating world of isotopes, introduced the technique of isotope pulse labeling and despite of general busy was always disposed to answer any question and solve any problem. Prof. Francesca Cotrufo, Dott.sa Ilaria Inglima, Dott.sa Carmine Lubritto for their assistance and effective collaboration during the in situ pulse labeling procedure, sampling preparation and analyses. Dr. Luca M. Belelli who introduced me to the basis of the flux measurements and field work organisation, and finally thanks to whom was maturated the idea to start the PhD course. Latilla Leonardo, Renato Zompanti, Francesco Mazzenga and Manuela Balzarolo for organizing the logistic to the experimental site, help in biomass sampling, soil respiration measurements and their nice company during the filed campaigns. Dr. Ilya Yevdokimov for his support in realization of soil induced respiration experiment. Dr. Rick Wehr and Dr. Rudzani Makhado for their help in correcting the English version of some chapters of this work. To my family for their support and patience during these three years. ',( (." #/0!.( 1)2( -("34)5 166
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explain diurnal and seasonal change
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sull’intensità del flusso respir
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8 3.2.4. Data analyses and definiti
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1. INTRODUCTION AND OVERVIEW 11
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times as much carbon as the terrest
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Fig. 3 Different soil C pools with
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1.3. Soil respiration sources Soil
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conditions, like soil type, plants
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For grasslands, the nature, frequen
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(a) (b) (c) Fig.7 Amplero (AQ, Ital
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magnitude of root respiration and o
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efficiency, indicating future posit
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approaches for studying of the cont
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Houghton R.A., 2003. Revised estima
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Vleeshouwers L.M., Verhagen A. 2002
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2.1. Introduction 36 Soil respirati
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38 In the year 2005 ten PVC collars
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2.2.4. Biochemical analyses Microbi
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42 Variation of soil respiration fr
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CO 2 efflux (mmol m -2 s -1 ) 44 CO
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46 All diurnal measurements of root
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48 Q10 R 2 p Rs 2.51 0.77 0.000 Ra
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the photosynthesis and its followin
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2.3.3. Inter-annual variation of so
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54 RS RHET 8 6 6 4 25 4 2 2 25 20 T
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2.4. Discussion 2.4.1. Partitioning
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measurements, the possibility to fi
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and Schlesinger, 1992; Moyano et al
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Janssens I.A., Pilegaard K., 2003.
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Xu X., Kuzyakov Y., Wanek W., Richt
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3.1. Introduction Soil respiration
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Our experiment was conducted in a m
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Lactic acid 13 C 13 CO2 Root-derive
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At the end of the process, the subl
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where, MAs - the mean age of the co
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13C of respiration ( o / oo ) 155 1
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Total Label Recovered (TLR, %) Ra R
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GPP (mmol m -2 s -1 ) 25 20 15 10 5
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frequent and possibly they missed t
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3.4.3. Destructive vs. Non-destruct
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Gavrichkova O., Kuzyakov Y., 2008.
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Chapter source: 90 4. THE EFFCT OF
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Bardgett et al. (1997) showed that
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94 Partitioning plots were installe
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Microbial C was calculated as a dif
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taken from 1 µg N-NO2 ml -1 soluti
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ates between clipped and unclipped
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Fig. 7 Total (Rs), root (Ra)- and m
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104 Rh, (CO 2 , mmolm -2 s -1 ) 7 6
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Fig. 11 Cumulative microbial respir
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108 After the calculation of synthe
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Fig. 16: a) Relationship between sy
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an annual mowing the measurement wa
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mineral N available to plants and N
Page 116 and 117: Cambardella C.A., Elliott E.T., (19
Page 118 and 119: Rice C.W., Moorman T.B., Beare M, 1
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Page 122 and 123: 5.1. Introduction 122 Nitrogen (N)
Page 124 and 125: specie, c) an additional aim was to
Page 126 and 127: 5.2.4. Sampling and analyses 126 Na
Page 128 and 129: the differences between N and contr
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Page 132 and 133: Fig. 4 a) Intensity of 14 CO2 efflu
Page 134 and 135: Fig. 6 a) values above zero: root-d
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Page 138 and 139: plants. The growth stage could cont
Page 140 and 141: nitrates. At temperatures of 15 - 2
Page 142 and 143: experiment could be responsible for
Page 144 and 145: Horwath W.R., Pretziger K.S., Paul,
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Page 148 and 149: 148 6.1 . Introduction In studies o
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Page 154 and 155: 154 100% 80% 60% 40% 20% 0% 85% 13%
Page 156 and 157: 6.3.2. 2008: Mesh- exclusion vs. re
Page 158 and 159: 6.4. Discussion 6.4.1. Mesh-exclusi
Page 160 and 161: introduction in a small soil sample
Page 162 and 163: component, expressing a total soil
Page 164 and 165: Kucera C.L., Kirkham D.R., 1971. So
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