النمو الطولي و التراكم القطري لسيقان خلفات شجرة السدر Willd. Ziziphus spina-christi (L.)‎ في أراضي الري بالآبار و السيول بوادي دمون-حضرموت

الملخص EN

Wadi Damoun is one of the tributaries of main Wadi Hadhramout.

Two irrigation systems have been selected and after felling Ziziphus trees, ten trees from each farm have been selected randomly.

Coppices were calculated and measured.

Mean coppices length growth were high (6.45 m and 4.778 m) at first year in irrigated and spate areas respectively.

Standard deviations of mean length measurements were high ( not accepted ) in all years ( 0.598 - 1.740 m ),( 0.982 - 1.991 m ) in irrigated and spate areas respectively.

Coefficient variations in length were not accepted in first and fourth years ( 25.172% & 21.161% ) and well in others ( 7.031% - 16.499% ) in irrigated area while in spate area were medium ( accepted ) in seventh and the eighth years ( 13.925% & 15.925% ) and high in other years ( 25.446% - 40.089% ).

Mean growth of coppice stem diameter is high in first year at the two irrigation systems (3.229 & 2.108cm ).

Standard deviations of mean coppices diameters were high in all years at the two irrigation systems (1.608 – 3.240 cm ), ( 0.99 – 2.689 cm ) while coefficient variations were high also at the two irrigation systems in all years (30.674% – 49.805% ), (33.612% – 47.396% ).

Mean accumulation diameters of coppices trees histogram were not regular in wells irrigation system when compared with histogram of spate irrigation.

The irrigated and spate areas experiments showed that there is some significant difference at 5% level between annual means diameters accumulation in years.

High annual mean diameters accumulation were recorded 69.6 cm in the seventh year and 27.0 cm in the eighth year in irrigated and spate areas respectively.