CENTURY is a general model of plant-soil nutrient cycling which has been used to simulate carbon and nutrient dynamics for different types of ecosystems. It can be used to assess soil matter turnover, which can indicate the state of degradation. CENTURY is composed of a soil organic matter/decomposition submodel, a water budget model, a grassland/crop submodel, a forest production submodel, and management and events scheduling functions. It computes the flow of carbon, nitrogen, phosphorus, and sulfur through the model's compartments.
ABT 5. Habitat loss, fragmentation and degradation
By 2020, the rate of loss of all natural habitats, including forests, is at least halved and where feasible brought close to zero, and degradation and fragmentation is significantly reduced.
A review of coastal management approaches to support the integration of ecological and human community planning for climate change
This review describes the use of natural infrastructure in tidal marsh, beach and barrier island, mangrove, and biogenic reef habitats along the Atlantic, Gulf of Mexico, and Caribbean coasts of the United States. The term natural infrastructure refers to planned networks of natural lands that conserve or enhance ecosystem values and services (see Ozment et al., 2015). The benefits, opportunities, and challenges of implementing natural infrastructure in a coastal zone are compared to those of grey and hybrid infrastructure.
The Regional and Subregional Assessment of Biodiversity and Ecosystem Services for Asia and the Pacific
DNDC is a computer simulation model of carbon and nitrogen biogeochemistry in agro-ecosystems. The model can be used for predicting crop growth, soil temperature and moisture, carbon dynamics, nitrogen leaching, and trace gases emissions.
The DNDC model can assess the soil matter turnover, which can indirectly indicate the state of degradation. It is a point-scale model and can be extrapolated to large spatial extents using remote sensing and GIS approaches.
The HYDRUS computer software packages simulate the one-, two- or three- dimensional movement of water, heat and multiple solutes in variably saturated media. The program numerically solves the Richards' equation for saturated-unsaturated water flow and Fickian-based advection dispersion equations for heat and solute transport. The Flow equation incorporates a sink term to account for water uptake by plant roots. The Heat transport equation considers conduction as well as convection with flowing water.
RUSLE helps assess land degradation through soil related measures. RUSLE estimates long-term annual soil loss due to erosion across different land uses and land management activities.
The RUSLE equation, developed by the U.S. Department of Agriculture, estimates average annual soil erosion as follows: A = R*K*L*S*C*P
A = average annual soil loss
R = rainfall erosivity
K = soil erodibility
L = slope length
S = slope
C = cropping
P = conservation practice
MIMES is an ecosystem-based management tool. It integrates georeferenced datasets, with diverse information sources on human and natural systems to create systems models. These systems models assess the value of ecosystem services at different spatial levels under different future scenarios. These are bespoke models for particular cases.
The MIMES approach has been applied in New Zealand and Massachusetts. It is also under development for use by the Ministry of Fisheries in Cambodia in managing the Tonle Sap Lake.
Conservation Evidence (www.conservationevidence.com) collects and summarises scientific evidence on the effectiveness - or otherwise - of conservation actions. Concise, plain-English accounts of how well conservation actions have worked can be used by decision-makers to make conservation planning more effective.