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43 MANAGING TSUNAMI-AFFECTED SOILS IN ACEH AND NIAS Peter Slavich 1 , T Iskandar 2 , Achmad Rachman 3 , Prama Yufdy 4 , Hasil Sembiring 5 Slavich et al. 1 NSW Department of Primary Industries (NSW DPI), Australia; 2 Aceh Assessment Institute for Agricultural Technology (BPTP NAD), Indonesia 3 Indonesian Soil Research Institute (ISRI), Indonesia; 4 North Sumatra Assessment Institute for Agricultural Technology (BPTP SUMUT), Indonesia; 5 Indonesian Rice Research Centre (IRRC), Indonesia Abstract The impacts of the earthquake and tsunami in NAD province and North Sumatra caused large changes to the landforms, soils and the hydrology of coastal floodplains used for agriculture. These changes include reductions in land elevation, opening of estuaries, erosion of beach sands, deposition of transported soils and marine sediments, and salinisation of soil and water resources. The extent of these changes was highly variable across the affected area which resulted in site specific effects on soil properties and crop production. This paper summarises the main tsunami impacts affecting soils and strategies to manage tsunami affected soils for cropping. INTRODUCTION The impacts of the earthquake and tsunami in NAD province and Nias on agricultural lands were most severe on the narrow coastal strip along the west coast of Sumatra. They were also wide spread on the coastal river floodplains of the east and west coasts. The impacts caused major changes to the hydrology of the floodplains, coastal wetlands and estuaries. The earthquake resulted in a reduction in land elevation along the west coast of Sumatra and east coast of Nias, causing previous coastal agricultural land to become submerged under the sea (Figure 1). The erosive forces of the tsunami opened estuaries, transferred beach sands and coastal acid sulphate soils inland and reshaped wetlands. The tsunami also deposited sediments from the sea floor on the land. These transported terrestrial and marine deposits blocked drainage and irrigation systems. The deposition of variable depths of sand, clay and peat materials (Figures 2-5) resulted in a more heterogeneous soil landscape. There was also significant salinisation of soils due to sea water inundation. The salinity impacts were most severe in low lands closest to the sea where landscape changes were greatest. International Workshop on Post Tsunami Soil Management, 1-2 July 2008 in Bogor, Indonesia
44 Slavich et al. Figure 1. West coast of Sumatra showing submergence of land 14 months after the earth quake Figure 2. Deposited sand, stones and gravel at Lhoong on west coast of Sumatra International Workshop on Post Tsunami Soil Management, 1-2 July 2008 in Bogor, Indonesia
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Proceedings International Workshop
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iii FOREWORD The active subduction
Page 6 and 7: Ladies and Gentlemen, v We are situ
Page 8 and 9: Ladies and Gentlemen, vii The time
Page 10 and 11: ix sediment, soil and water salinit
Page 12 and 13: xi TABLE OF CONTENTS FOREWORD .....
Page 14 and 15: 1 Harjadi PJP INDONESIA TSUNAMI EAR
Page 16 and 17: 3 Harjadi PJP Figure 3. Site distri
Page 18 and 19: 5 Harjadi PJP The Operational compo
Page 20 and 21: 7 Harjadi PJP National Coordinating
Page 22 and 23: 9 Harjadi PJP • UNESCO, IOC, ITIC
Page 24 and 25: 2.5. Buoys (BPPT) 11 Harjadi PJP Be
Page 26 and 27: 4. Situation Center 13 Harjadi PJP
Page 28 and 29: Figure 18. The decision support sys
Page 30 and 31: Figure 20. Observation perspective
Page 32 and 33: Figure 23. Five in one information
Page 34 and 35: 21 Niino Y AGRICULTURAL IMPACTS IN
Page 36 and 37: 23 Niino Y rehabilitation of salt-a
Page 38 and 39: 25 Niino Y who lost their crops, li
Page 40 and 41: 27 Niino Y damage afflicting agricu
Page 42 and 43: 29 CONCLUSION AND RECOMMENDATIONS N
Page 44 and 45: 31 Niino Y − Income generation th
Page 46 and 47: 33 Abubakar and Basri REHABILITATIO
Page 48 and 49: 35 Abubakar and Basri Table 1. Ligh
Page 50 and 51: 37 Abubakar and Basri Table 3. Thic
Page 52 and 53: 39 Abubakar and Basri Table 5. Padd
Page 54 and 55: CONCLUSIONS 41 Abubakar and Basri R
Page 58 and 59: 45 Slavich et al. Figure 3. Tsunami
Page 60 and 61: 47 Slavich et al. they were not aff
Page 62 and 63: 49 Slavich et al. factors observed
Page 64 and 65: 51 DYNAMICS OF TSUNAMI-AFFECTED SOI
Page 66 and 67: 53 Rachman et al. measured using th
Page 68 and 69: 55 Rachman et al. Table 2. Characte
Page 70 and 71: 57 Rachman et al. Figure 2. Distrib
Page 72 and 73: 59 Rachman et al. complex are domin
Page 74 and 75: Soil depth (cm) B Soil depth (cm) C
Page 76 and 77: 63 Rachman et al. empty pods. The f
Page 78 and 79: 65 ENVIRONMENTAL RISKS OF FARMING O
Page 80 and 81: 67 Agus F of North America, Europe
Page 82 and 83: International Workshop on Post Tsun
Page 84 and 85: IMPLICATIONS 71 Agus F Land suitabi
Page 86 and 87: 73 Agus F Proceedings of the 12th I
Page 88 and 89: 75 POST-TSUNAMI AGRICULTURE LIVELIH
Page 90 and 91: Nagapattinam Background Geographica
Page 92 and 93: 79 Mohan GMC extensively in compari
Page 94 and 95: 81 Mohan GMC NGOs wherever there wa
Page 96 and 97: 83 Mohan GMC Between February’05
Page 98 and 99: 1.7. Constraints: 85 Mohan GMC •
Page 100 and 101: 87 Mohan GMC The successful first y
Page 102 and 103: 89 Joshi L ACCELERATING LIVELIHOOD
Page 104 and 105: POVERTY AND TREE CROPS 91 Joshi L P
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93 Joshi L The survey conducted in
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CONCLUSIONS 95 Joshi L Aceh and Nia
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97 Sembiring et al. IMPLICATIONS OF
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99 Sembiring et al. level of tolera
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101 Sembiring et al. Leaching, soil
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103 Sembiring et al. Aceh Barat. Th
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105 Sembiring et al. lowland rice t
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107 Sembiring et al. and developmen
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109 Iskandar and Chairunas PALAWIJA
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111 Iskandar and Chairunas Tunong V
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113 Iskandar and Chairunas DPTPH Pr
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115 INSTITUTIONAL DEVELOPMENT FOR P
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117 Shea et al. Material support wa
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TRANSPORTATION 119 Shea et al. Duri
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121 Shea et al. As highlighted duri
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123 Shea et al. Connection Centers:
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125 Shea et al. Photographs: Left -
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127 Shea et al. Photographs: Left -
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MEDIA FOR WOMEN FARMERS 129 Shea et
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131 McLeod et al. SOIL SALINITY ASS
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133 Figure 1. Locations of assessme
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135 McLeod et al. fields after the
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137 Wahyunto et al. ASSESSMENT OF A
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139 Wahyunto et al. 2004 (before th
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141 Wahyunto et al. Since the major
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143 Wahyunto et al. Table 1. Existi
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145 Wahyunto et al. low fertility),
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147 Wahyunto et al. Table 2. Method
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CONCLUSIONS 149 Wahyunto et al. Lan
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151 Wahyunto et al. FAO. 1976. Fram
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153 Sammut et al. TECHNICAL CAPACIT
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155 Sammut et al. associated manage
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157 Sammut et al. Tarunamulia, 2006
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159 Sammut et al. Unfortunately, a
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161 Sammut et al. Gosavi K, Sammut
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163 Chairunas DEVELOPING TECHNOLOGY
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165 Chairunas Table 1. The average
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REFERENCES 167 Chairunas BPS. 2007.
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169 List of Participants Internatio
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171 Didi Ardi S., Dr. Indonesian So
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173 Irawan, Dr. Indonesian Soil Res
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175 Mulyadi, Mr Indonesian Institut
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177 Subhan, Mr Institute for Vegeta
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179 Astu Unadi, Dr. Kepala Balitkli
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