Volume 97, Issue 2
April 1987, pages 81-183
pp 81-155 April 1987
There are several reviews on the chemistry, biochemistry and uses of carbohydrates in general. The scope of the present review is restricted essentially to research done on the plant carbohydrates in India and information available in research journals. Emphasis is placed on the various classes of plant carbohydrates, viz free sugars, water-soluble polysaccharides, starch, pectins, gums and mucilages, hemicelluloses and cellulose. Different aspects of work on these polymers have been covered in a broad sense, such as chemistry and structure, biochemistry, nutrition and processing-modification-application.
pp 157-164 April 1987
The pattern of release of N, P and K from decomposing leaf-litter of 3 species was investigated. These elements were continually released in all 3 litter types. Among the 3 elements studied, K was released rapidly in all the 3 litter types. No immobilization phase was evident.
pp 165-176 April 1987
Coexistence of closely relatedEupatorium species. I.Eupatorium odoratum L. versusEupatorium adenophorum Spreng. andEupatorium adenophorum Spreng. versusEupatorium riparium Regel. at different altitudes
At their altitudinal limits at 950 m elevation,Eupatorium adenophorum was more susceptible to density-dependent mortality but plasticity of individual organs including reproductive growth was more adversely affected inEupatorium odoratum. In mixtures,Eupatorium adenophorum had an edge overEupatorium odoratum suggesting that the former checks the upper altitudinal limit of the latter.Eupatorium adenophorum andEupatorium riparium coexist well in their mid-altitudinal range of 1500 m. In pure stands,Eupatorium adenophorum was more susceptible to density stress thanEupatorium riparium. Eupatorium riparium was more aggressive thanEupatorium adenophorum in the mixture of increased interspecific competition. In mixtures, these two sets of competing species are less affected than could be expected from the effect of crowding; they, perhaps, occupy different ecologic niches.
pp 177-183 April 1987
The competitive relationships betweenEupatorium adenophorum andEupatorium riparium were studied at Barapani (950 m) and Upper Shillong (1700 m) using 3 altitudinal populations of the former and one population of the latter.Eupatorium riparium was generally more susceptible to competition from the native population ofEupatorium adenophorum compared to the introduced population. The two species tended to avoid each other in mixtures to a certain degree, due to niche differentiation.