Research Journal of Environmental Sciences1819-34122152-8238Academic Journals Inc.10.3923/rjes.2009.299.310GholipoorM. 3200933The regionally determination of direction of runoff
changes is a challenging task. This simulation study was aimed to evaluate
the past changes in runoff for sloped farms of five locations in Iran
(Isfahan, Shiraz, Kermanshah, Tabriz and Mashhad) in 2006-2007. The soil
water balance sub-model of CYRUS model with some modifications was used
to calculate the value of runoff over monthly and yearly periods and over
growing period of chickpea. The model was run for the daily weather data
set from 1961 (or 1966) to 2004. Linear regression analyses were used
to determine the trends (slopes) in value of runoff. The results indicated
that in Isfahan, the value of runoff has increased for January, March
and yearly period; on the other hand, it has had a downwardly change for
April; runoff has shown statistically steady state for the rest months
of the year. It appeared to have upwardly trend just for December in Shiraz.
In Kermanshah, it was found the increasing trend in runoff for December,
but decreasing trend for February and May. The months February and November
have experienced the increasing risk of runoff in Tabriz and Mashhad,
respectively. Over growing period of chickpea, this risk has been diminishing
for Isfahan and Kermanshah; while it found to be constant for other locations.
There is a consensus for inversed relation between recommendable slopes
of land for planting the crops, including chickpea and risk of runoff;
hence, it can be said that the recommendable slopes for planting the chickpea
(Cicer arietinum) in declivitous farms of Isfahan and Kermanshah
is steeper in 2000s as compared to those in 1960s.]]>Amir, J. and T.R. Sinclair,1991Georgievsky, V., A. Yu, A.V. Ezhov, I.A. Shalygin and I.A. Shiklomanov et al., 1996Aizen, V.B., E.M. Aizen, J.M. Melack and J. Dozier, 1997Barzegar, A.B. and A. Soltani,2007Gholipoor, M. and A. Soltani, 2006Brown, R.D., 2000Gholipoor, M., A. Soltani and S. Sharafi, 2006Dai, A., I.Y. Fung and A.D. DelGenio, 1997Gholipoor, M.,2007Doorenbos, J. and W.O. Pruitt,1977Gholipoor, M.,2008Folland, C.K., T.R. Karl, J.R. Christy, R.A. Clarke and G.V. Gruza et al., 2001Gholipoor, M.,2008Gholipoor, M. and A. Soltani, 2008Garcia, N.O. and W.M. Vargas, 1998Gholipoor, M. and S. Shahsavani,2008Groisman, P.Y., P.W. Knight and T.R. Karl, 2001Gholipoor, M. and A. Soltani,2005Groisman, P.Y., R.W. Knight, T.R. Karl, D.R. Easterling, B. Sun and J. Lawrimore, 2004Groisman, P.Y. and E.Y. Rankova, 2001Hennessy, K.J., R. Suppiah and C.M. Page, 1999Haylock, M. and M. Nicholls,2000Huntington, T.G., 2006Houghton, J.T., Y. Ding, D.C. Griggs, M. Noguer and P.J. van der Linden et al.,2001Knisel, W.G.,1980Lins, H.F. and P.J. Michaels, 1994Manton, M.J., P.M. Della-Marta, M.R. Haylock, K.J. Hennessy and N. Nicholls et al.,2001Mekis, E. and W.D. Hogg, 1999Milly, P.C.D. and K.A. Dunne, 2001Mwale, D., T.Y. Gan and S.S.P. Shen, 2004Purcell, I.C., T.R. Sinclair and R.W. McNew,2003Rahimi-Karizaki, A. and A. Soltani,2007Ritchie, J.T., 1991SAS,1989Scho¨nwiese, C.D. and J. Rapp, 1997Sinclair, T.R.,1994Soltani, A., K. Ghassemi-Golezani, F.R. Khooie and M. Moghaddam,1999Soltani, A., F.R. Khooie, K. Ghassemi-Golezani and M. Moghaddam,2000Soltani, A., B. Torabi, E. Zeinali and R. Sarparast,2004Soltani, A., B. Torabi and H. Zarei,2005Soltani, A. and M. Gholipoor, 2006Soltani, A., G.L. Hammer, B. Torabi, M.J. Robertson and E. Zeinali,2006Soltani, A., M.J. Robertson and A.M. Manschadi,2006Soltani, A., M.J. Robertson, Y. Mohammad-Nejad and A. Rahemi-Karizaki,2006Soltani, A., M.J. Robertson, B. Torabi, M. Yousefi-Daz and R. Sarparast,2006Soltani, A. and B. Torabi,2007Soltani, A., M. Gholipoor and K. Ghassemi-Golezani,20072 effects on radiation use efficiency in chickpea (Cicer arietinum L.).]]>Soltani, E. and A. Soltani, 2008Tanner, C.B. and T.R. Sinclair,1983Zhai, P.M., A. Sun, F.M. Ren, X. Liu, B. Gao and Q. Zhang,1999Zhai, P.M., Ren, F.M. and Q. Zhang, 1999Zhang, X., K.D. Harvey, W.D. Hogg and T.R. Yuzyk, 2001Zhang, X., L.A. Vincent, W.D. Hogg and A. Niitsoo, 2000Clapp, C.E., R.R. Allmaras, M.F. Layese, D.R. Linden and R.H. Dowdy,2000Kumar, K. and K.M. Goh, 1999Martens, D.A.,2000Power, J.F., P.T. Koerner, J.W. Doran and W.W. Wilhelm, 1998