Tanzanian rangelands in a changing climate: Impacts, adaptations and mitigation

Abstract

Livestock are central to the livelihoods of Tanzanians who rely on them for income via sales of milk, meat,\nskins and draught power. Owning livestock is amongst the ways in which many Tanzanians could diversify\ntheir risks, increase assets and improve their resilience to changes in climate. Though local coping\nstrategies can deal with shocks in the short-term, they are hardly able to cope with more frequent and\nsevere climate events. Observably, temperature, rainfall and atmospheric CO2 concentration interact with\ngrazing and land cover change to influence rangeland quality and composition. Increased temperature\nincreases drought stress and tissue lignifications in plants and, consequently, affects their digestibility and\ndecomposition rate. Increased temperature and lower rainfall also increases vegetation flammability\nresulting in a shift in species composition due to increased fire frequency. Literature indicates that, Tanzania\nrangelands receiving between 400 and 1000 mm of rain per year (e.g. Kongwa, Monduli, Kiteto, Simanjiro,\nNgorongoro, Babati, Hanang, Mbulu and Karatu) have greatest impact on climate change on surface\ndrainage. A 10% drop in rainfall of 1000 mm per year in a rangeland results in a decline in surface drainage\nof only 17%, while in areas of 500 mm per year will result in a 50% decline. Interventions such as controlled\nanimal stocking rates, sustainable yield and use of good pasture will lessen the negative impacts of climate\nchange on rangelands. Opportunities for reducing greenhouse gas emissions on rangelands include\nmaintaining or increasing carbon sequestration through better soil management and reducing methane\nproduction by altering animal management practices on rangelands. There is a need to focus on enabling\nherd mobility through securing better access to water resources, land use planning, and improve early\nwarning systems and supporting a diversification of livelihoods