Biological and climatic factors responsible for dieback of juniper in Ziarat,Balochistan [Pakistan]
2005
Chaudhary, M.A. | Aslam, M.,Pakistan Forest Inst., Peshawar (Pakistan)
Study of biological threats in relation to climate causing dieback of Juniperusexcelsa M.B. in Ziarat was carried out by selecting 4 localities out of 15 during2004. The selected localities were Sasnak, Kharwari Baba, Bastargai and KirbeeKach. Three plots each of 1.22 ha/locality was selected at random. There were 954Juniper trees in these selected localities. Each individual tree was studied formistletoe, fungus and insect infestation. Fungal attack was recorded at all the 4localities and intensity of infection in descending order was 61.59%, 40.55%, 39.56%and 25.04% in Kirbee Kach, Kharwari Baba, Bastargai and Sasnak, respectively.Arcethobium oxycedri attack was limited to Sasnak valley only and infested 32.77%trees. Insect attack was observed on fruit berries of 31.13% trees in 4 selectedlocalities. Data also indicated an increase of 2.4 degree C in temperature, reductionof 316 mm in precipitation, increase of 71 % in livestock heads, increase of 3.5% inhuman population, fungal infection and, insect infestation of trees of the selectedlocalities might be the dieback causing climatic and biological threats to Juniper inZiarat valley.
显示更多 [+] 显示较少 [-]