| Potential of earlywood and latewood ring width parameters of teak (Tectona grandis L.F.) from central India in relation to the monsoonal climate |
| Paper ID : 1015-ADA2013 |
| Authors: |
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Amar Bishwamber Sikder * Indian Institute of Tropical Meteorology, Pashan, Pune-411008, INDIA |
| Abstract: |
| ABSTRACT A good quality tree-ring data network has been established from central and peninsular parts of India. About 40 tree-rings core has been used for the present study. The central and peninsular regions of India is strongly influenced by summer monsoon rainfall where more than 75% of total annual precipitation is received during the monsoon seasson ( June – September ). The tree-ring chronologies prepared goes back to the year 1775. The teak chronologies of central and peninsular India may be used as high resolution proxy to understand the variation in past precipitation and moisture. Preliminary analysis based on response function and correlation analysis. Initial results of two to three century long tree-ring chronologies of teak show significant correlations with monsoon precipitation. It is evident that, two to three consecutive good monsoon years are capable of maintaining normal or above normal tree growth, even though the following year is low precipitation year. In this paper, earlywood, latewood and total ring width parameters of teak (Tectona grandis L.F.) from Allapalli forest region of central India have been used for dendroclimatic analysis. It is observed that the frequency of occurrence of false rings is relatively more and confined to the latewood zone as compared with the earlywood part of the ring. It is also observed that the pre-monsoon showers followed by prolong dry spell in the beginning of the growing season of the teak may cause occurrence of earlywood false rings. All the tree-ring parameters show moderately high dendroclimatic potential by virtue of their high values of mean sensitivity and common variance. Variations in earlywood width contribute more to the total ring-width than the variations in latewood width. Correlation analysis indicates significant positive relationship of rainfall and Palmer Drought Severity Index (PDSI) of summer months (pre-monsoon; MAM and monsoon; JJAS) with earlywood and total ring-width parameters, whereas late wood width variations are directly related to post-monsoon (Oct-Nov) rainfall. Frequency of occurrence of low tree growth index was significantly higher during the recorded deficient monsoon rainfall years, associated with El Nino events. Analysis indicates the potential of earlywood and latewood width parameters along with the total ring width of teak in reconstructing the summer monsoon rainfall variations since past few centuries. |
| Keywords: |
| Earlywood width, latewood width, tectona grandis, monsoon climate, Central India |
| Status : Abstract Accepted |
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