Rehabilitation of Degraded Lands in Watersheds TK Sreedevi Suhas P Wani M sman and Shailendra Tiwari International Crops Research Institute for the SemiArid T ropics ICRISAT Patancheru 502 32 Andhra Pradesh Ind ID: 74961
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!" !"#$ehabi%itation#of#&egraded#'ands#in#Watersheds #K$Sreede%i&$Suhas$P$Wani&$'$(s)an$and$Shailendra$#iwari!nternational"Crops"Resear#h"!nstitute"$or"the"Semi%Arid"Tropi#s"&!CR!SAT'Patan#heru"()*"+*,-"Andhra"Pradesh-"!ndiaCentral"Resear#h"!nstitute"$or"Dryland"Agri#ulture"&CR!DA'Santoshnagar-"Hyderabad"())")./-"Andhra"Pradesh-"!ndiaSeva"Mandir-"Old"0atehpura-"1daipur"%"+ +")),-"Ra2asthan-"!ndia (bstra)t There are about !" cate#ories of wastelands identi$ed in India, which constitute about 20%!7& of total #eo#ra'hical area% The Govt% of India has identi$ed !(6 districts in !9 states for micro-'lannin# of de#raded lands% Nearly )"& of wastelands are in Andhra Pradesh, Gu*arat, Karnataka, +adhya Pradesh, +aharashtra, .rissa, Ra*asthan, Tamil Nadu and /P% This 'a'er analyses the classes of wastelands and di1erent a''roaches to reclamation of these lands%Keywords:$Watersheds, wasteland, livestock, land de#radation, common 'ro'erty resources% Introd*)tion The soil erosion, caused 'rimarily by water and wind, is one of the ma*or contributors to the land de#radation% Livestock vis-3-vis over#ra4in# is yet another factor causin# de#radation of the e5istin# common 'ool resources 8CPRs:% The e5istin# CPRs, which include the natural #ra4in# lands have very 'oor #reen cover to feed the livestock% Heavy #ra4in# intensity reduces vi#or of #ra4ed 'lants, distort the 'lant #rowth 'attern and chan#e the biodiversity com'osition of the #ra4in# land% The land de#radation leads to the loss of soil, water, biota as well as nutrients from the to'soil% .n the other hand im'roved 'ractices result in e;cient and accelerated nutrient recyclin# system, im'roved intake of rainwater and thus stimulate 'lant #rowth% +,tent#of#&egraded#'ands There are various estimates of wastelands ran#in# from ")%( m ha to !)7 m ha due to di1erent methods em'loyed 8Table !:% There are about !" cate#ories of wastelands identi$ed in India, which constitute about 20%!7& of total #eo#ra'hical area 8NRSA, 2000: 8Table 2:% The Govt% of India has identi$ed !(6 districts in !9 states !+ for micro-'lannin# of de#raded lands% Nearly )"& of wastelands are in Andhra Pradesh, Gu*arat, Karnataka, +adhya Pradesh, +aharashtra, .rissa, Ra*asthan, Tamil Nadu and /P% #a,le$1-$$.arious$es/i)a/es$o0$was/eland$in$2ndia$3)-$ha415- !"#$%%'()!*)+!+',))-%!.)'#%'/'+0!1',)2!330440!1)!1)&5#0$",+"#%)6/2&789:;-898;.08;8:=.=?@0#%$+!#'+%)!*)A$!1!30$4)B) +'+04+0$4C)@%D+.)!*)&5#0,)B)2!!D%#'+0!1?E.F8GH0104+#I)!*)&5#0$",+"#%)689EG8:=.⡀=? !$0%+I)*!#)J#!3!+0!1)!*)K'4+%,'1L)@%M%,!D3%1+)6 JK@789EF8G9.;?9@%D'#+3%1+)!*)A1M0#!13%1+)'1L)N!#%4+4)6OO)P!Q#'C)89E-280;.99;9=.-593; .64;G9/'+0!1',)K'4+%,'1L)@%M%,!D3%1+)O!'#L)6H!AN789E=-692;.08;8G?.?:/'+0!1',)O"#%'")!*) !0,) "#M%I)B)R'1L)S4%)J,'11015)6T2&U7899F-266;8E:.=:/'+0!1',)U%3!+%) %14015)&5%1$I)6/U &7899=;?.E=G-101;.7;/.2.) 'V%1')6 %$.)U@7K@8G=.⡀?E !"#$%W)P.O.)A4X'#'1C)2Q'0#3'1) JK@C)/%X)@%,Q0C)T1)J#!$.)!*) %301'#)!1)K'4+%,'1L)@%M%,!D3%1+C)H'#⡀⡀$Q)G8C)J78F #a,le$ -$6rea$under$ea7h$7a/egory$o0$was/eland$in$2ndia- 2'+%5!#I%'6 Y)Z3()!*)+!+',)5%!5#'DQ0$)'#%')$!M%#%L8.-",,0%L)'1L[!#)#'M%1!"4),'1L)Gʄ.;==?.Fʄ.;.;=G.R'1L)X0+Q)!#)X0+Q!"+)4$#"\89Fʄ.;8F.?;.8??.S1L%#)"+0,0]%L[L%5#'L%L)1!+0^%L)*!#%4+),'1L)ʄ.;8F;=G.?F.FFF.H01015[01L"4+#0',)X'4+%,'1L)8G=G.8ʄ.;ʄ.;.F=.O'##%1)#!$ZI[4+!1I)X'4+%[4Q%%+)#!$Z)'#%';F=EF.EG.ʄ.;F;. +%%D)4,!D015)'#%':;=;.?ʄ.;.GF:. 1!X)$!M%#%L)'1L[!#)5,'$0',)'#%'==:EE.=8.:;E.@%5#'L%L)D'4+"#%4[5#']015),'1L)G=9:E.9ʄ.;.EG9.@%5#'L%L),'1L)"1L%#)D,'1+'+0!1)$#!D=EGE.8ʄ.;.8E8ʄ.;. '1L4701,'1L[$!'4+',=ʄ.;ʄ.;G8.;8.=E88.K'+%#),!55%L)'1L)3'#4QI),'1L)8;=;E.=ʄ.;.=G8G.R'1L)'**%$+%L)\I)4',010+I[',Z',010+I7$!'4+',701,'1Lʄ.;GF::.Fʄ.;.;=8?. Q0*+015)$",+0M'+0!1)'#%'?=8FG.G8.88_!+',)X'4+%,'1L)'#%';?E=8E.?Gʄ.;.G/!+%W)8CGʄ.;CEF9)4Y)Z3)01)`Ba)04)1!+)3'DD%L)'1L)Q%1$%)1!+)$!140L%#%L)*!#)$',$",'+015)+Q%)D%#$%1+'5%. !"#$%W)/U &)6Gʄ.;ʄ.;ʄ.;.) !8 -armoni.ation#of#&atabases#for#&e)ision#Ma/ers Harmoni4in# databases for land use and land evaluation is essential to address the key issues related to land resources and sustainable develo'ment of de#raded lands% There is a #rowin# concern that various e1orts are 'roducin# data sets, which are incom'atible and $#ures do not match% This 'oses di;culties for decision makers to rely u'on data emanatin# from di1erent scienti$c or#ani4ations% Wastelands information of National Remote Sensin# A#ency 8D.S: and soil de#radation of National Bureau of Soil Survey and Land /se Plannin# 8ICAR: form a #ood e5am'le% Therefore, there is a need for conver#ence of these data sets throu#h harmoni4ation to evolve a viable decision su''ort system at 'olicy makers level% The re'orted area under wastelands and their di1erent cate#ories by di1erent or#ani4ations has been si#ni$cantly varyin#% As 'er the Wasteland Atlas of India 'ublished recently by +oRD and NRSA, the area under wastelands is 6"%)= m ha 8NRSA, r.0;靰2000: based on !?=0,000 scale ma''in# whereas, NBSS@L/P has re'orted soil de#radation of !(6%) m ha in the country out of soil ma''in# on !?2=0,000 scale% The methodolo#y ado'ted for harmoni4ation of data sets consisted of collection of information available with NRSA, NBSSL/P, AISL/S and CAERI, e5aminin# the de$nitions ado'ted by them, sco'e for harmoni4in# the classes in the le#end of the ma's and availability of ma's 8Ramakrishna et al% 2007:% The nation-wide data are available only with NRSA and NBSSL/P% The data of AISL/S were coverin# only 'art of the country and hence not used in harmoni4ation% The com'arison of le#ends between wastelands and de#raded soil indicates that the common cate#ories between wasteland ma's and soil de#radation ma's are #ullied andFravinous lands, semi-stabili4ed to stabili4ed sand dunes, waterlo##ed @ marshy lands and land a1ected by salinityFalkalinity% However, there are some e5clusive cate#ories such as land withFwithout scrub, shiftin# cultivation, de#raded forest-scrub dominated, de#raded 'astureF#ra4in# land, a#riculture land inside noti$ed forest, de#raded land under 'lantations, stee'ly slo'in# area loss of to' soil, terrain deformation, over blowin# and loss of nutrients in soil de#radation ma'% After thorou#h deliberations on the data sets of wastelands and soil de#radation, a le#end com'risin# wasteland classes and soil de#radation was 're'ared and the statistics were #enerated on de#raded lands of India% The wasteland classes were com'ared with soil de#radation classes to arrive at common classes and mutually e5clusive classes% As 'er the harmoni4ed e1orts, the total de#raded lands in the country are !0=%96 m ha% The $#ure for soil de#radation by water erosion 8loss of to' soil: is 20%=2 m ha and "%76 m ha for wind erosion 8loss of to' soil:% The area under !9 #ully formation under water erosion is )%(7 m ha and under ravines is !%9 m ha% /nder wind erosion the aerial e5tent of over blowin# is !%)9 m ha and "%2( m ha under terrain deformation% The chemical de#radation consists of salini4ationFalkali4ation and acidi$cation 8J(%= 'H: where the harmoni4ed statistics are 6%7" m ha and 6%!9 m ha, res'ectively% /nder water lo##in# two cate#ories namely surface 'ondin# 80%97 m ha: and sub-surface water lo##in# 8=%(( m ha: have been identi$ed% The ve#etal de#radation with water erosion includes land withFwithout scrub, de#raded forest - scrub dominated, a#riculture land inside noti$ed forest, de#raded 'astureF#ra4in# land, de#raded land under 'lantations and abandoned @ current shiftin# cultivation areas of wasteland ma' 're'ared by NRSA% The area has been estimated to be "=%(= m ha% The other cate#ory includes minin# and industrial waste, barren rockyFstony waste and snow coveredFice ca's and their aerial e5tents are 0%2 m ha, =%77 m ha and =%(" m ha, res'ectively% 0%asses#of#Waste%ands#and#0orre)ti1es Since wastelands are un'roductive for di1erent socio-economic and bio-'hysical reasons, di1erent technical solutions will be needed% Broadly s'eakin#, Venkateswarlu 8200": #rou'ed the wastelands into? u /ncultivable u Cultivable u Social u +ar#inalSome details are discussed below? 2n)*%ti1ab%e#Waste%ands The $rst reason is lack of soil of any kind% This includes those areas of barren rocky outcro's and where the surface consists lar#ely of fractured rock, coarse #ravel or loose boulders% The Himalayan 'eaks, fro4en arid valley of Ladakh and the hot arid deserts of north-west a#ain come in this cate#ory% They can be im'roved only by 'lantin# s'arse forest cover in select micro-sites or soil 'ockets% 0*%ti1ab%e#Waste%ands These areas have some soil and include lar#e areas where the soil is e5cessively acidic, alkaline, saline or waterlo##ed either naturally or throu#h 'revious mismana#ement% Such areas may be turned 'roductive by? !; u selectin# es'ecially tolerant s'ecies and varieties or arable cro's or trees, u s'ecial soil treatments like dee' 'lou#hin#, draina#e etc, and u chemical amendments like limin#, #y'sum or sul'hur a''lication%Generally, such treatments 8ii @ iii: are costly and only hi#h value cro's are likely to #ive an economic return% Therefore, selection of tolerant trees may be the only economically viable o'tion% 3o)ia%#Waste%ands This is another cate#ory of wastelands that are cultivable% The soils would lar#ely be #ood with climate that is not e5treme% But various social and economic factors make these lands sub*ect to e5cessive e5'loitation 'ressures that remove the 'roductive ca'ital as well as the interest or harvestable annual 'roduction%Amon# these are, mainly the lands where ownershi' is either ambi#uous, absent or is common% Mvidently nobody has a controllin# interest to mana#e it for lon# term 'roduction% .n the other hand everybody has an interest in e5tractin# as much as 'ossible% Returnin# such lands to 'roductivity will reOuire social and economic ad*ustments that can come throu#h 'eo'les 'artici'ation%IR+A, Anand had a detailed study on such Qsocial wastelands throu#h si5 case studies% They conclude that the most desirable answers to be? u assi#n 'ro'erty ri#hts on newly develo'ed wastelands to individual 'oor families.1; with technical back sto' lar#ely from voluntary a#encies.1;