Arbuscular Mycorrhizal Colonization in Five Tropical Forest Tree Legumes of Chittagong University Campus in Bangladesh

Arbuscular mycorrhizal (AM) colonization in five tropical forest tree legumes (Gliricidia sepium, Dalbergia sissoo, Indigofera tysmanii, Delonix regia and Samanea saman) was investigated in Chittagong University (CU) campus. The results of the present study clearly suggests that, Vesicular AM fungi (VAM) are common in all the studied forest tree species, and that the studied forest tree species differ in their rates of AM formation. The intensity of colonization is maximum (98%) in I. tysmonii followed by D. sissoo (95%), D. regia (63%), S. saman (59%) and G. sepium (52%). Coiled structures of hyphae were recorded in D. regia. Arbuscule formation was recorded in D. sissooand in I. tysmonii. Mycorrhizal spores were found in rhizosphere soils of all the sites. Glomus, Acaulospora, Entrophospora and Gigaspora spores were identified in all the hosts. Forest plants differ in their rates of AM formation. Edhapic conditions like moisture content, soil pH also influence the extent of root colonization.Keyword: Mycorrhizae, Legume, Colonization, Edhapic condition, Rhizosphere, Underground networking

Arbuscular Mycorrhizal Colonization in Five Tropical Forest Tree Legumes of Chittagong University Campus in Bangladesh

Arbuscular mycorrhizal (AM) colonization in five tropical forest tree legumes (Gliricidia sepium, Dalbergia sissoo, Indigofera tysmanii, Delonix regia and Samanea saman) was investigated in Chittagong University (CU) campus. The results of the present study clearly suggests that, Vesicular AM fungi (VAM) are common in all the studied forest tree species, and that the studied forest tree species differ in their rates of AM formation. The intensity of colonization is maximum (98%) in I. tysmonii followed by D. sissoo (95%), D. regia (63%), S. saman (59%) and G. sepium (52%). Coiled structures of hyphae were recorded in D. regia. Arbuscule formation was recorded in D. sissooand in I. tysmonii. Mycorrhizal spores were found in rhizosphere soils of all the sites. Glomus, Acaulospora, Entrophospora and Gigaspora spores were identified in all the hosts. Forest plants differ in their rates of AM formation. Edhapic conditions like moisture content, soil pH also influence the extent of root colonization.Keyword: Mycorrhizae, Legume, Colonization, Edhapic condition, Rhizosphere, Underground networking

Size-dependence of the respiration of Kandelia obovata trees at Manko Wetland

琉球大学21世紀COEプログラム「サンゴ礁島嶼系の生物多様性の総合解析」平成20年度成果発表会（平成21年3月14日開催）　講演・特別講演会場：理系複号棟102号室，ポスター発表会場：琉球大学50周年記念館1

Litterfall studies on mangrove Kandelia obovata stands at Manko Wetland, Okinawa Island, over three years

琉球大学21世紀COEプログラム「サンゴ礁島嶼系の生物多様性の総合解析」平成20年度成果発表会（平成21年3月14日開催）　講演・特別講演会場：理系複号棟102号室，ポスター発表会場：琉球大学50周年記念館1

People, Policy, and Perpetuity: Sustainability Indicators of Bangladesh Forestry

How resources and social factors shaped sustainable development of Bangladesh forestry and forest products

Acclimation of acacia hybrid (Acacia mangium x Acacia auriculiformis) vegetative propagules to soil water deficits

The aim of the present work was to investigate the acclimation potential of acacia hybrid (Acacia mangium Willd×Acacia auriculiformis A.Cunn.ex Benth)vegetative propagules to soil water stress in the nursery of Institute of Forestry and Environmental Sciences, Chittagong University. Acacia hybrid showed significant decrease in total plant biomass in two months water-stressed conditions. Allocation of assimilates to root growth relative to shoot found to be an important acclimation mechanism. Leaf area ratio (LAR)increased under water-stressed plants with simultaneous increase in specific leaf area (SLA)but almost no change in leaf weight ratio (LWR). Significant increase in LAR with limited water supply by increasing SLA was likely to be an important acclimation potential since this relative increase in leaf area compensated, at least partially, for a lower photosynthesis under water-stressed conditions aswas evident from decreased mean total biomass under water-stressed regimes

SEASONAL FOLIAGE DYNAMICS OF MANGROVE Bruguiera gymnorrhiza (L.) lamk. IN A SUBTROPICAL REGION, MANKO WETLAND, OKINAWA ISLAND, JAPAN

In case of mangroves, little information is available on seasonal crown leaf area growth and leaf survival. Therefore, it is necessary to investigate the dynamics of crown foliage to understand the productivity of mangroves. The present study describes the crown foliage dynamics of  Bruguiera gymnorrhiza (L.) Lamk., Okinawa Island, Japan, which is the northern limit of its distribution. This study was carried out from April 2008 to March 2009. The crown foliage dynamics includes the leaf recruitment and survival. The production and fall of leaves were investigated by a direct observation of a sample tree of B. gymnorrhiza as well as by an indirect observation of litterfall measurement. The numbers of surviving and dying new leaves were totaled monthly. Newly flushed leaves occurred successively throughout the year, with a maximum in July and a minimum in January. The highest leaf death was in June, whereas the lowest was in December. The crown leaf area was almost stable throughout the year, having a peak in December. The homeostatic control of the crown foliage area may also be accompanied by the regulation of leaf recruitment and death. Therefore, the present results suggest the existence of integrated mechanisms between the internal and external factors maintain the crown foliage area