TheImprovement ofTropical and Subtropical Rangelands

SITE EVALUATION 113
by component. Most on-site lIUrVeys and obeervatiol1l of natural resources
are based on a component approach, although the individual
components being evaluated are not necessarily considered in isolation.
Within a systems framework, the components that are related
to the improvement ofa site must be evaluated in an integrated manner.
By doing 80, all of the elements of an ecosystem, both abiotic
and biotic, will be studied to form as complete a picture as p088ible
of a site being considered for improvement.
One final point: many site evaluatiol1l fail to include a provision
to monitor the changes in an ecosystem that could, subsequently,
have an influence on the succet!18 of a range improvement effort.
Therefore, to the extent possible, monitoring should be provided
to be sure that temporal changes, both positive and negative, are
recorded and identified for pOll8ible changes in put project management
as well as for use in future project planning.
In the preceding pages, much haa been said about the various
facton that need to be measured and evaluated. How these components
are used in evaluation has not been discuaed. A computer
model is not generally the answer. Some limits may be needed to
delineate the range of acceptable conditions.
UfEUNCES
Avery, T. E. 1916. NtIIvrol Ruourr:u Mccuurwtnent.. McGraw-Hill, New York,
N_ York, USA.
Beinroth, l". H. 1916. Relationlhip between U.S. lOil taxonom,., the Bruilian
lOil cluliflcation l"mm and l"AO/UneKO lOil unitl. Pp. 92-108, in Soil
MGJlGflfMf'fl in 7I-opiCGl America, E. Born_mme and A. Alvarado, edl.
Proc:eedinp of a Seminor held in Call, Colombia, 10-14 February 1914.
North Carolina State Univenity, Raleigh, North Carolina, USA.
Bell, J. l". and T. Atterbury. 1983. RcnctDtJIJ. RuotftC Inwnloriu /01' Monilonn,
Claan,u and 7JomcU. Orecon State Univenity, Corvaltm, 0!'elon, USA.
Brown, D. 1964. Methods of IUrvlI7ing and meuuring vegetation. Bw/.tin 0/
tM OommonV1CClltla Burcew 0/ Puturc and Firld oro" 43. Commonwealth
Agricultural Bureaux, P'arnham Ro,.&1, England.
Buffo, J., L. J. l"ritlChem, and J. L. Murph,..
1912. DirId Solar RMiation on
VarioUl Slo"., from 0 to 60 D.".., NortA lAtitude. ReHarch Paper PNW-142,
l"Oreit Service, U.S. Department of Agriculture, Wuhin,ton, D.C., USA.
Buol, S. W., l". D. Hole, and R. J. McCraken. 1980. Soil G.nuU and CfaMifi,c4tion,
2nd ed. Iowa State Univenity Pre.., Am_, Iowa, USA.
Butler, B. E. 1980. Soil CfaMitwmon /or Soil Sunn,. Clarendon Preu, Oxford,
England.
Cain, S. A. and G. M. de Oliveira Cutro. 1969. Manual 0/ V"ctation Ana/r_.
Harper and Row, New York, New York, USA.