عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
TLpq303711693
انگلیسی
Livestock grazing and its impacts on soil, water and vegetation in a temperate range of Pakistan
[Thesis]
F. Bari
K. M. Wood
New Mexico State University
1989
116
Ph.D.
New Mexico State University
1989
Livestock grazing affects various hydrologic processes such as infiltration, and sediment production. Overgrazing affects the range site productivity, water quality, and siltation of reservoirs. Range scientists are concerned about regulating livestock grazing which can assure a sustained forage production without deteriorating watershed condition. If the grazing land is a critical part of a watershed, then watershed values should be given priority. Any grazing management plan should include these considerations for the proper utilization of the natural resources. This experiment was started in a temperate range of Pakistan in 1987. The main purpose of the experiment was to determine a suitable residual phytomass level for the moist temperature ranges of Pakistan. The data were collected for two consecutive growing seasons. A completely randomized design, with four treatments, and two replications were used. The treatments were four different residual phytomass levels. A hand-portable rainfall simulator was used to apply rainfall to 48 flexible circular plots, about 1 meter square in size. Correlation analysis, simple linear regression, and stepwise multiple regression, were used to determine treatment differences, and to identify the important vegetation and soil variables affecting infiltration and sediment production. The control (treatment 1) resulted in the highest infiltration and lowest sediment production, while treatment 4, having the lowest residual phytomass, produced the lowest infiltration and highest sediment production. Among the independent variables, the standing phytomass was the most important variable affecting infiltration and sediment production. Foliar cover, and basal cover were also highly correlated to these dependent variables. Keeping in view the findings of the experiment, the siltation rate of Tarbela Dam, and the prevailing socio-economic conditions of the people of the area, the most suitable residual phytomass level should be 600-1000 kg ha.
Biological sciences
Range management
F. Bari
K. M. Wood
مطالعه متن کتاب p
[Thesis]
276903
a
Y
