• U Baruah

      Articles written in Proceedings – Plant Sciences

    • Growth strategies of early and late successional shrubs from a subtropical moist forest under two light regimes

      U Baruah P S Ramakrishnan

      More Details Abstract Fulltext PDF

      Two early successional shrubsMallotus indica Muell. andClerodendron infortunatum Gaertn. and two late successional shrubs,Litsea khasiana Meissn. andCombretum flagrocarpum Herb. were studied under both open and shade environments. The early successional species had greater dry weight allocation to the stem and leaf components and lesser allocation to the root component. Thus the early successional species had an exploitative strategy for effective light capture and utilization of nutrient enriched surface soil after clear-cutting of a forest. On the other hand, the late successional shrubs showed a reverse pattern in allocation. This was related for their survival and to make adequate growth in a competitive environment. These differential strategies of the two categories of shrubs was also reflected in the lower nutrient uptake efficiency and higher use efficiency of the late successional species compared to the early successional ones. Under shade the dry weight production of late successional species was reduced to a less extent than that of early successional species. This would presumably have a competitive advantage for the former category of species.

    • Architecture and growth patterns of early versus late successional shrubs of sub-tropical moist forests of north-eastern India

      U Baruah P S Ramakrishnan

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      Growth and architecture of early versus late successional shrubs are compared and contrasted to evaluate their leaf display characteristics. Early successional shrubs had a higher growth rate over an extended period of time compared to late successional shrubs. Inter-branch length and branch angle were greater for late successional species as compared to early successional ones. First- and second-order branch production over third-order branches was greater in late successional shrubs, whereas the reverse was the case for early successional ones. On the other hand, length contribution by all branch orders was higher for the early successional species. The bifurcation ratio was significantly higher for early successional species growing in the open as compared to late successional shrub species growing in shade. Early successional shrubs follow an exploitive strategy and make faster growth whereas late successionals have a conservative strategy for survival in shade.

    • Leaf dynamics of early versus late successional shrubs of sub-tropical moist forests of north-eastern India

      U Baruah P S Ramakrishnan

      More Details Abstract Fulltext PDF

      The two early successional shrubs (Melastoma malabathricum L. andMussenda frondosa L.) are periodic growth leaf-exchanging-types (leaf fall is associated with bud break; leaf span of leaves being approximately 12 months), whereas the two late successional ones (Litsaea khasiana Meissn andOxyspora vagans Wall.) are periodic growth evergreen types (leaf fall is completed well after bud break; life span of leaves being a little over one year). Early successional shrubs have larger leaf production and faster turn-over rates, unlike late successional shrubs with production confined during the early part of the growing season (April–May) is geared to expose larger area over a longer time period, for survival under shade. The early successional shrubs have an exploitative strategy whereas the late successionals are conservative in nature for survival under shade.

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