We studied seedling survival and growth ofAquilaria malaccensis in three different environmental conditions （homegardens, green house and in different canopy conditions） of northeast India. Results show that mean se...We studied seedling survival and growth ofAquilaria malaccensis in three different environmental conditions （homegardens, green house and in different canopy conditions） of northeast India. Results show that mean seasonal survival was highest in green house （95.53%±2.33）, followed by homegardens （89.3%±1.89） and different canopy conditions （77.62%±6.73）; the highest values were found during February to April for both the homegardens （96%±1.68） and green house （98% ± 0.88） and lowest during November to January （78%±2.99） in homegardens and May to July （90%：t：4.53） in green house. In case of transplanted seedlings in different canopy conditions, mean seasonal survival was highest during May to July （98%±1.92） and lowest during August to October （66%±12.81）. However, mean seasonal growth of collar diameter was highest in different canopy conditions （23.99%±1.76） compared to green house （21.52%±2.70） and homegardens （12.44%±1.33） and it was highest during rainy season （May to July） and lowest during dry winter （November to January） in all the three experi- mental sites. These variations may be due to the different microclimatic conditions as well as nutrient status of the soil in all the three experimen- tal sites. Although, seedling quality plays a great role in their survival and growth, based on the result of green house experiment, it can be concluded that maintenance of seedlings in green house conditions during their early growth period may improve both the survival and growth for large scale plantation of the species. Thus, the species can be reintroduced in its natural forest range to compensate the loss of natural population of this precious species in northeast India.展开更多
Background:Tropical forests play a crucial role as source and sink in global carbon cycle.Development and other anthropogenic activities have led to degradation of forest land,and ultimately,it results in loss of biod...Background:Tropical forests play a crucial role as source and sink in global carbon cycle.Development and other anthropogenic activities have led to degradation of forest land,and ultimately,it results in loss of biodiversity and increases concentration of CO_(2) in atmospheres.Therefore,there is urgent need to estimate regional and national level carbon stock for making forest-based policies and strategies for mitigation of CO_(2).Patchy and sporadic information is available on biomass and carbon stock of Indian forests.The paper presents a systematic review and comprehensive account of studies conducted in different forest types in India.Result:There are six major forest types found in India consisting of 15 groups and other subgroups with peculiar characteristics.Methodologies used by researchers for biomass/carbon stock estimation are destructive,nondestructive,tree inventories data,species-specific biomass estimation,and remote sensing.Majority of estimates are based on nondestructive allometric equation approach.Studies showed positive correlation between tree species,diameter at breast height,and biomass/carbon stock.Small-and medium-sized growing trees,invasive species,mixed forest,Agroforestry,and Agrosilviculture also play an important role in atmospheric carbon assimilation.The results of diverse forest carbon stock studies are broadly categorized in North,Central,and Southern India.Present review will be helpful for developing conservation policies and decision to increase carbon stock and also REDD+program for particular forest ecosystem.Conclusion:The systematic literature review was carried out to gather and summarize information from different studies conducted on forest ecosystems and quantification methods used for biomass estimation and carbon stock in different forests types and states of India.In general,great variability occurs in aboveground biomass and carbon stock on account of climatic and geographic differences.To obtain good and accurate estimations,following nondestructive approach,species-specific density-based equations are required from different habitats and also in relation to degradation status of forests.As such regional volume equations would increase error of estimations.The comprehensive account of data would be helpful to formulate strategies based on carbon sequestration in Indian forests for CO_(2) mitigation.展开更多
基金supported by DBT,Govt. of India through the project "Mapping and quantitative assessment of geographic distribution and population status of plant resources of Eastern Himalayan Region"
文摘We studied seedling survival and growth ofAquilaria malaccensis in three different environmental conditions （homegardens, green house and in different canopy conditions） of northeast India. Results show that mean seasonal survival was highest in green house （95.53%±2.33）, followed by homegardens （89.3%±1.89） and different canopy conditions （77.62%±6.73）; the highest values were found during February to April for both the homegardens （96%±1.68） and green house （98% ± 0.88） and lowest during November to January （78%±2.99） in homegardens and May to July （90%：t：4.53） in green house. In case of transplanted seedlings in different canopy conditions, mean seasonal survival was highest during May to July （98%±1.92） and lowest during August to October （66%±12.81）. However, mean seasonal growth of collar diameter was highest in different canopy conditions （23.99%±1.76） compared to green house （21.52%±2.70） and homegardens （12.44%±1.33） and it was highest during rainy season （May to July） and lowest during dry winter （November to January） in all the three experi- mental sites. These variations may be due to the different microclimatic conditions as well as nutrient status of the soil in all the three experimen- tal sites. Although, seedling quality plays a great role in their survival and growth, based on the result of green house experiment, it can be concluded that maintenance of seedlings in green house conditions during their early growth period may improve both the survival and growth for large scale plantation of the species. Thus, the species can be reintroduced in its natural forest range to compensate the loss of natural population of this precious species in northeast India.
文摘Background:Tropical forests play a crucial role as source and sink in global carbon cycle.Development and other anthropogenic activities have led to degradation of forest land,and ultimately,it results in loss of biodiversity and increases concentration of CO_(2) in atmospheres.Therefore,there is urgent need to estimate regional and national level carbon stock for making forest-based policies and strategies for mitigation of CO_(2).Patchy and sporadic information is available on biomass and carbon stock of Indian forests.The paper presents a systematic review and comprehensive account of studies conducted in different forest types in India.Result:There are six major forest types found in India consisting of 15 groups and other subgroups with peculiar characteristics.Methodologies used by researchers for biomass/carbon stock estimation are destructive,nondestructive,tree inventories data,species-specific biomass estimation,and remote sensing.Majority of estimates are based on nondestructive allometric equation approach.Studies showed positive correlation between tree species,diameter at breast height,and biomass/carbon stock.Small-and medium-sized growing trees,invasive species,mixed forest,Agroforestry,and Agrosilviculture also play an important role in atmospheric carbon assimilation.The results of diverse forest carbon stock studies are broadly categorized in North,Central,and Southern India.Present review will be helpful for developing conservation policies and decision to increase carbon stock and also REDD+program for particular forest ecosystem.Conclusion:The systematic literature review was carried out to gather and summarize information from different studies conducted on forest ecosystems and quantification methods used for biomass estimation and carbon stock in different forests types and states of India.In general,great variability occurs in aboveground biomass and carbon stock on account of climatic and geographic differences.To obtain good and accurate estimations,following nondestructive approach,species-specific density-based equations are required from different habitats and also in relation to degradation status of forests.As such regional volume equations would increase error of estimations.The comprehensive account of data would be helpful to formulate strategies based on carbon sequestration in Indian forests for CO_(2) mitigation.
