STUDY ON THE SOIL CARBON SEQUESTRATION OF AGROFORESTRY SYSTEMS AS A MITIGATION STRATEGY OF CLIMATE CHANGE IN DINAJPUR DISTRICT, BANGLADESH

Abstract

The study was carried out in three locations of Dinajpur district namely HSTU campus, Birol upazila and Sadar upazila, during January 2019 to June 2019 to observe soil carbon sequestration of agroforestry system as a mitigation strategy of climate change in Dinajpur district, Bangladesh. Eighty six (86) composite soil samples were collected at 0-30 cm in different areas of studies area. Three adjacent soil samples were collected from an each agroforestry system and mix together to get composite soil samples. The total number of samples was composed of three groups, 32 samples were cropland agroforestry and 27 samples were homestead agroforestry and 27 were orchard agroforestry systems. The findings showed that the soil organic carbon (SOC) and soil organic matter (SOM) changes over the change of ages. For example SOC and SOM of 5 years old mango garden had (0.5%) and (0.6 %) respectively. Again in case of agroforestry systems study showed that there are significant differences among the systems. The highest soil organic carbon (SOC) was found (1.60%) from Eucalyptus woodlot based agroforestry system and the lowest soil organic carbon was found 0.29 % from mahagoni woodlot based agroforestry system but both organic carbon and organic matter are very low compared to optimum level. On the other hand, in case of soil pH the highest result was recorded (5.45) under mango tree while lowest result was recorded (5.12) under mahagoni tree. Based on above findings the researcher concluded that all the collected samples were acidic. And finally, in case of soil moisture the highest result was recorded (10%) from Ghora neem species and lowest was recorded (6%) from Mahagoni tree. Finally it may be concluded that in most species homestead agroforestry system gave maximum SOC and SOM as compared to cropland and orchard if we consider addition more SOC and SOM to the soil and environmental safety practicing homestead agroforestry system is a viable option.