Bu calisma; Hindistan, Uttarakhand, Bati Himalaya, Garhwal'daki Tehri Baraji'nin su altinda kalan kismindaki cesitli bitki topluluklarinin icinde ve arasindaki bitki yapisi ve topluluk sablonlari hakkindadir. Su altinda kalan kisim (SZ), Bhagirathi su alti bolgesi (BGSZ) ve Bhilangna su alti bolgesi (BLSZ) seklinde iki vadiden olusmaktadir. TWINSPAN vasitasiyla su alti bolgesinin her ikisinde de, farkli baglantilari olan dort onemli bitki toplulugu tespit edilmistir. cogu kisimlarinda tur zenginligi ve cesitliliginin az-cok benzer oldugu Bhilangna SZ'a kiyasla, Bhagirathi SZ'deki bolgelerin cogunda tur zenginligi ve cesitliligi yuksekti. Bolgelerin cogundaki esitlik degerleri; turlerin Bhagirathi SZ'da esit sekilde dagildiklarini, Bhilangna SZ'daki bolgelerin cogunda ise heterojen olarak dagildiklarini goster ektedir. Ancak, turlerin orani degisiklik arzetmektedir. Bhagirathi SZ'a kiyasla Bhilangna SZ'da ß-cesitlilik daha yuksektir. Her iki turun toplam mevcut biyokutlesi bakimindan, Lantana'nin biyokutlesi (74.5%), Carissa (25.4%) ile kiyaslandiginda, su altinda kalan kismin tamaminda yuksekti. Ancak turlerin toplam mevcut biyokutlesi icinde, Carissa (2.2%)'nin ekstraksiyonu Lantana (1.2%)'ya kiyasla daha fazlaydi.
The present paper deals with the vegetation structure and community patterns within and between various plant communities in the Tehri Dam Submergence Zone in Garhwal, in the western Himalaya, Uttarakhand, India. The submergence zone is comprised of two valleys, the Bhagirathi submergence zone and the Bhilangna submergence zone. Four major plant communities were identified in both the submergence zones with varied associations through TWINSPAN. Most of the communities are similar in both the submergence zones, while their associations altered due to the micro-climatic variations. The species richness and diversity was high in most of the sites in the Bhagirathi submergence zone compared to the Bhilangna submergence zone, where species richness and diversity were more or less similar in most of the sites. The evenness values in most of the sites indicate that the species were distributed evenly in the Bhagirathi submergence zone, while heterogeneously in most of the sites in the Bhilangna submergence zone. However, the rate of species change, for example, the ß- diversity was higher in the Bhilangna submergence zone compared to the Bhagirathi submergence zone. The biomass of Lantana (74.5%) was high for the entire submergence zone compared to Carissa (25.4%), with respect to the total available biomass for both species. However, the extraction was more for Carissa (2.2%) as compared to Lantana (1.2%), with respect to the total biomass of each species.
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