TheImprovement ofTropical and Subtropical Rangelands

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160 IMPROVBMENT 0' TROPIOAL AND SUBTROPIOAL RANGBLA.NDS FIGURE 7-6 Seedbed preparation caD be done quickly but expeuively with heaYJ equipment, u in thia example in Morocco (a), or br local me&ILI that may be .lower but more COlt effective, u in thia aampl. in Sen.pI (b). (J. O'Rourke) [ 1.)ltIZ ,d byCoogIe
REHAB1LlTATlON TECHNIQUES 161 Plant Materiah The plant Ipecies selected for seeding must be compatible with management objectives (for example, palatability and growth period). It is important to use only those species and varieties well adapted to the lOil, climate, and topography of the specific lite being revegetated. If native species are chosen, seed of local origin should be used. Improved ecotypes, varieties, and introduced species may be available for revegetation and should be used. Species chosen for seeding must not only be adapted to the site but also appropriate for the future use and management capabilities of the lite. (See chapter 8 for more details on plant selection.) Plant DifJernt, A diverse ground cover will generally result in reduced lOil erosion, and mixtures of grasses, forbs, and shrubs will better meet the multiple needs of the land user. The danger in monocultural seeding is that disease or insect infestation can eliminate the one species planted, whereas in a mixture, the differing characteristics of the various speciel would better assure a higher percentage of survival. The numerous ecological niches of variable terrain generally support higher levels of species diversity. Seetl Treatment The dormancy of most seeds can be overcome through the use of pretreatmentl designed to IOften, puncture, wear away, or Iplit the seed coat in order to render it permeable without damaging the embryo and endosperm within. They include physical and biological methods, dry heating, and soaking in water or chemicallOlutions. For further information, see Willan (1985). Various microbial treatments, IUch as nitrogen-fixing bacteria or mycorrhizal fungi, may enhance seedling lurvival. Seetling Rates It is important to use enough seed to establish adequate plant densities, but not more seed than necessary to accomplish this. Too much seed can produce a Itand of seedlings 10 thick that individual plants compete with each other. Species of plants, the number of pure live seedl (PLS) per kilogram, and the potential productivity ofthe site are major factors in determining the rate of seeding. PLS il determined by multiplying the germination of a lot of seed by its purity. Seeding rates providing 125-250 PLS per m 2 should be used when the seed is placed in the lOil with a drill. Broadcast seeding is an inefficient method of revegetation, and should be used only where other methods cannot be used. Many broadcast seeds are left on the soil surface where germination and
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- ....... .I,"U1J:1~ National Resea
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PANEL ON THE IMPROVEMENT or TROPICA
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can be restored to the world's rang
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4 Dromedary Pastoralism in Mrica an
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OVERVIEW 3 associated with the exte
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OVERVIEW 5 results, they must be su
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OVERVIEW 7 higher levels of biologi
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OVERVIEW 9 of approaching this obje
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Introduction In this report, rangel
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INTRODUCTION 15 protein per hour of
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INTRODUOTION 17 Moreover, grain cro
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Sudan 66 million hectlln8 (permanen
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Zambia Countrywide, Upper Zambesi (
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People's Democratic Republic ofVeme
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Saudi Arabia Countrywide 85 miIllon
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Arghaniatan 30 million hectara Low
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INTRODUCTION 29 knowledge, adaptati
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1 The Nature ofTropical and Subtrop
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THE NATURE 0' TROPIOAL AND SUBTROPI
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THE NA.TURE OF TROP/OAL AND SUBTROP
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THE NATURE OF TROPICAL AND SUBTROPI
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TllB aoorAL aoNTEXT FOR RANGELAND I
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THE SOOIAL OONTEXT FOR RANGELAND IM
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THE SOOIAL CONTEXT FOR RANGELAND IM
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T11B aOorAL OONTl:XT FOR RANQIILAND
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THE SOorAL OONTEXT FOR RANGELAND IM
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THE ECONOMIC CONTEXT 55 proved extr
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THE ECONOMIC CONTEXT 57 • The cas
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THE EOONOMIO OONTEXT 59 Climate and
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THE EOONOMIO OONTEXT 61 CAlIH_11ON
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THE EOONOMIO OONTEXT 63 and returns
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THE ECONOMIC CONTEXT 65 The basic p
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THE EOONOMIO OONTEXT 67 can give a
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THE EOONOMIO OONTEXT 69 evaluation.
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THE EOONOMIO OONTEXT 71 fashion or
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4 Regional Resource Assessment The
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REGIONAL RESOUROE ASSESSMENT 75 onl
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REGIONAL RESOUROE ASSESSMENT 77 wil
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REGIONAL RESOURCE ASSESSMENT 79 spe
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REGIONAL RESOUROB ASSB88MENT 81 Aqa
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REGIONAL RESOUROE ASSESSMENT 83 imp
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REGIONAL RESOUROE AS8mJSMENT 85 60
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REGIONAL RESOUROE ASSB88JlENT 87 Ta
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REGIONAL RESOUROE ASSESSMENT 89 •
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REGIONAL RESOUROE ASSESSMENT 91 FIG
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N r;; (L ~ C) o ~ -rv • 01 . •
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REGIONAL RESOUROE ASSESSMENT 95 The
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SITE EVALUATION 97 The natural proc
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SIT8 EVALUATION 99 Climate is diffi
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SITB EVALUATION 101 Instantaneous m
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SITE EVALUATION 103 by field observ
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SITE EVALUATION 105 dynamics ofan e
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SITE EVALUATION 107 macbiuery at le
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Page 121 and 122: SITE EVALUATION 111 Animal 7Jpe. Al
Page 123 and 124: SITE EVALUATION 113 by component. M
Page 125 and 126: SITE EVALUATION 115 National Raearc
Page 127 and 128: GRAZING MANAGEMENT 117 Species that
Page 129 and 130: GRAZING MANAGEMENT 119 the loss of
Page 131 and 132: GRAZING MANAGEMENT 121 seed product
Page 133 and 134: GRAZING MANAGEMENT 123 FIGURE 8-2 (
Page 135 and 136: GRAZING MANAG8MENT 125 FIGURE 6-4 A
Page 137 and 138: GRAZING MANAGEMENT 127 FIGURE 6-6 C
Page 139 and 140: GRAZING MANAGDIBNT conditions by pr
Page 141 and 142: GRAZING MANAGEMENT 181 FIGURE 6-9 (
Page 143 and 144: GRAZING MANAGEMENT 133 The success
Page 145 and 146: GRAZING MANAGEMENT IS5 a more nutri
Page 147 and 148: GRAZING MANAGEMENT 137 flooded and,
Page 149 and 150: 7 Rehabilitation Techniques ESTABLI
Page 151 and 152: RBlIABILlTATlON TEOHNIQUES 141 to h
Page 153 and 154: REHABILITATION TEOHNIQUES 143 habit
Page 155 and 156: REHABILITATION TEOHNIQUES 145 Some
Page 157 and 158: REHABlLlTATION TEOHNIQUES 147 Topog
Page 159 and 160: REHABILn'ATlON TEOHNIQUES 149 years
Page 161 and 162: RE1IABILrl'ATION TEOHNIQUES 151 are
Page 163 and 164: REHABILITATION TEOHNIQUES 153 FIGUR
Page 165 and 166: RBllABILlTATlON TEOHNIQUES 155 Adva
Page 167 and 168: 1UUIAB1LlTATION TE01IN1QUEB 157 Adv
Page 169: REHABILITATION TEOHNIQUES 159 satis
Page 173 and 174: RElIABlL1TATION TEOHNIQUES 163 FIGU
Page 175 and 176: REHABHJTATION TECHNIQUES 165 FIGURE
Page 177 and 178: RBIlAB1LITATION TBOlINIQU1l8 167
Page 179 and 180: REHABIL17'ATION TEOHNIQUES 169 FIGU
Page 181 and 182: REHABILITATION TEOHNIQUES 171 plast
Page 183 and 184: R.ElIABILlTATION TEOHNIQUES 178 The
Page 185 and 186: REHABILITATION TECHNIQUES 175 6onne
Page 187 and 188: REHAB1LJTATION TECHNIQUES 117 Desic
Page 189 and 190: RE1lAlJ1LlTATION TBOHNlQUBS 179 tra
Page 191 and 192: RElIABlLlTATION TEOHNIQUES 181 sand
Page 193 and 194: REHABILITATION TEOHNIQUES 183 Barke
Page 195 and 196: REHABILITATION TEOHNIQUES 185 Sb.nl
Page 197 and 198: CRlTERlA FOR PLANT SELECTION 187
Page 199 and 200: ORITERIA FOR PLANT SELEOTlON 189 La
Page 201 and 202: ORJTERIA FOR PLANT SBLEOTION 191 70
Page 203 and 204: CRITERIA FOR PLANT SELECTION 193 AD
Page 205 and 206: 0R1TER1A 'OR PLANT SICLEOTION 195 m
Page 207 and 208: CRITERIA FOR PLANT SICLECTION 197 C
Page 209 and 210: CRITERIA 'OR PLANT SELEOTION 199 di
Page 211 and 212: • ORJTERIA FOR PLANT SELECTION 20
Page 213 and 214: ORJTERIA FOR PLANT SELEOTlON 203 st
Page 215 and 216: ORITERIA FOR PLANT SELECTION 205 An
Page 217 and 218: ORJTBRIA FOR PLANT SELECTION 207 In
Page 219: CRITERlA FOR PLANT SELEOTlON 209 Mo
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Introduction to the Case Studies Su
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INTRODUOTION TO THE OASE STUDIES 21
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PASTORAL REGIMES 0' MAURITANIA 217
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PASTORAL REGIMES OF MAURITANIA 225
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Case Study 2 The Beni Mguild ofMoro
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THE BEN! MGUILD OF MOROOOO 229 on t
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THE BENI MGUILD OF MOROOOO 231 thei
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THE BENI MGUILD OF MOROOOO 238 Alth
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THE BEN! MGUILD OF MOROOOO 235 -tle
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Case Study 3 The Kel Tamasheq SUSAN
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TIn: KEL TAMASHEQ 239 TABLE 8-1 Ave
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THE KEL TAMAS11EQ 20U TABLE S-4 Com
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TIlE KEL TAMASHEQ TABLE 3-6 Proport
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THE KEL TAMABHEQ 245 maintain healt
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25 0 25 IlO 75100 , ";) ~ 1:25kmL N
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THE KEL TAMASHEQ the two somehow me
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• Major well • Seuonal ftll •
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THE KEL TAMASHEQ 253 FIGURE 3-3 T8n
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THE KEL TAMASHEQ 255 N 1 I.. I ----
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THE KEL TAMASHEQ 257 about 10 m to
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TABLE 1-10 ComparUoD ofU_ of Variou
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Case Study 4 Dromedary Pastoralism
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DROMEDARY PASTORALISM IN AFRIOA AND
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DROMEDARY PASTORAUSM IN AFRIOA AND
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276 IMPROVEMENT OF TROPIOAL AND SUB
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278 IMPROVEMENT OF TROPIOAL AND 8UB
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282 IMPROVDaNT0' TROPIOAL AND SUBTR
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284 IMPROVEMENT OF TROPICAL AND SUB
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Case Study 6 The Marri Baluch ofPak
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290 IMPROVEMENT 0' TROPIOAL AND SUB
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Case Study 7 Changing Patterns ofRe
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~ IMPROVEMENT OF TROP/GAL AND SUBTR
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30& IMPROVBlD:NT OF TROPICAL AND SU
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310 IMPROVI:ID:NT OF TROP/GAL AND B
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Case Study 8 Kenya: Seeking Remedie
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Case Study 10 Wildlife Land Use at
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33" IMPROVEMENT 0' TROPICAL AND SUB
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338 IMPROVEMENT OF TROPIOALAND SUBT
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3.2 IMPROVIlMIlNT 0' TROPICAL AND S
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3« IMPROVEMENT OF TROPIOAL AND SUB
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3" IMPROVEAaNT OF TROPICAL AND SUBT
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Case Study 12 The Potential of Faid
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352 IMPROVEMENT 0' TROPICAL AND SUB
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356 IMPROVEMENT 01' TROPIOAL AND SU
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360 IMPROVEMENT 01' TROPICAL AND SU
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3M IMPROVEMENT OF TROPIOAL AND SUBT
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Case Study 13 Improving Nigeria's A
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370 Board on Science and Technology
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372 technologies in developine coun
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ham_ saline reeourcee that are sene
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376 scientists who were brought tog
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378 T.O.O.L. Publication, Entropotd
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TheImprovement ofTropical and Subtropical Rangelands

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