The community of living organisms in conjunction with the non-living components of their environment that interact as a system is referred to as ecosystem. The biotic and abiotic components are linked together by nutrient cycle and energy flows. Forest ecosystem is the basic ecologic unit in a particular forest. It exists as a habitat for a community of both native and introduced classified organisms. The collective living inhabitants of that forest ecosystem co-exist in symbiosis to create a unique ecology. It is a natural woodland unit which consists of all plants, animals and microorganisms of that area that function together with all of the non-living physical factors of the environment. The scientific study of the interrelated processes, patterns, flora, fauna and ecosystems in forests fall under the domain of forest ecology. This book provides comprehensive insights into the field of forest ecosystem. It presents researches and studies performed by experts across the globe. The readers would gain knowledge that would broaden their perspective about forest ecosystem.