Abstract:
Climatic changes are more intense in Himalayan region, and they have already altered the hydroclimatic balance, tree growth trend and plant distribution patterns. Dendrochronological studies include tree ring records as high resolution proxies for investigating response of climatic changes in tree radial growth. Tree rings from Himalyan region are highly important which is associated with diverse climate variation modulated by great altitudinal gradient in Himalayas. My studies in more than six different plant species including conifers and broadleaved trees broadly indicated that the radial growth is mainly conrolled by temperature related moisture in early growth season (March-May) in Himalaya, however there is site and species specific growth sensitivity. More particularly, the trees in altitudinal treelines are more sensitive to temperature, while those of timberline and even at low elevation (sub-tropical, temperature) show higher sensitivity to moisture. Warming temperatures, mainly day temperature (Tmax) is increasing more rapidly in entire Himalayan region (exceeding global average) and this has elevated evapotranspiration trend causing moisture limitation for tree radial growth. Hence it can be cocluded that the future trajectories of tree growth pattern is highly dependent on intensity of warming temperature and monsoon seasonality associated with overall precipitation trend. Further, tree radial growth at temperate and sub-tropical region in Himalaya is also influenced by forest level disturbance factors including human interference in forest management trends. More specified investigations on tree ring isotope analysis, wood anatomy and multi species response to climate variation are yet to be carried out for Himalayan region.
Speaker: Dr. Achyut Tiwari
Affiliation: Tribhuvan University Nepal
Time: 4:30 PM, Tuesday, Jan.10, 2023
Venue: ZOOM 会议平台 会议 ID：312 430 8960 会议密码 PWD：666666
ZOOM
会议 ID：312 430 8960
会议密码 PWD：666666
