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Rhizosphere plays an important role in regulating soil fertility and nutrient cycling in different ecosystems. Bamboos are important secondary successional plants in fallow land that have strong impact on the soil fertility of different fallow lands. The main objectives of the present study is to examined the rhizosphere effects of bamboo (Melocanna baccifera) on soil microbial properties (soil organic carbon, SOC; total nitrogen, TN; microbial biomass C and N, MBC and MBN; dehydrogenase activity, DHA; acid phosphatase activity, APA; β-glucosidase activity, GSA) in rhizosphere (RS) and bulk soil (BS) in shifting cultivation stand with different fallow phase (2 years old, FP-2; 5 years old, FP-5; and 10 years old fallow, FP-10) in Mizoram. The result indicated that soil microbial properties were significantly higher (p<0.05) in RS compared to BS. Further, the level of microbial properties significantly increases in longer fallow (FP-10) compared to shorter fallow (FP-2 and FP-5). On contrary, magnitude of rhizosphere effect of M. baccifera was greater in shorter fallow phase compared to longer fallow phase for all microbial properties except in APA and GSA. It was concluded that the rhizosphere effect of bamboo in shorter fallow is microbial mediated

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Aboveground biomass and carbon stock in tropical forest play an important role in global carbon cycle. Assessment of biomass and carbon pool in different forest stands may provide information in making decisions about the carbon management within the forest. Gmelina arborea, a fast growing species that is widely distributed and an important timber species of Mizoram has been chosen to assess its biomass and carbon stock. The present study was carried out to estimate the aboveground biomass and carbon stock in G. arborea in different forest stands of Mamit District, Mizoram, north-east India. The result shows that the total aboveground biomass ranged between 66-108 Mg ha -1 and carbon stock (30.00-53.20 mg C ha -1 ). The aboveground biomass and carbon stock was maximum in forest stands (site-III) with highest tree density and diameter class of 30-40cm and 40-50cm indicating the forest site was mature and undisturbed. The result demonstrates that G. arborea contribute in carbon sequestration and helps in mitigating global warming. Further, the aboveground biomass and carbon sequestration potential was greatly affected by the tree composition, population pressure and anthropogenic activities.