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Parameters of vegetation spatial structure have important effect on the carbon cycle and biodiversity of the ecosystems. How to estimate above-ground biomass is still a problem need to be worked out. In this paper we tried to use UAVSAR datasets to discuss the relation between backscattering coefficient and local incidence angle in different forest types. By the relation, a method based on scattering...
In this paper we present a forest scattering scenario consisting of solely vertical stems. Stems are the primary volume stores of forests; this model therefore simplifies the forest make-up to represent these major scatterers. This model representation is known as the “Matchstick Model” and is used as a comparison to backscatter data resulting from the combination of macro-ecology with a numerical...
Wetland is a significant component of the land ecosystems to discover the characteristics and ecological laws. Presently, a common method to estimate a regional wetland biomass is normally based on optical remote sensing images. The estimation of wetland biomass by Synthesize Aperture Radar (SAR) is a novel subject. As a new type sensor, SAR has advantages for wetland applications, therefore, it can...
The management of recreational fishing is a controversial subject in most jurisdictions. On the one hand, recreational fishing provides substantial economic benefits. Fishing activities, on the other hand, can threaten valuable fish stocks and cause damage to marine environments. However, most management strategies undertaken so far tend to be ad hoc and not supported by proper modeling. To address...
Understanding tree architectural plasticity is a major challenge. Functional-structural models can be of great interest to quantify the allocation patterns and their changes according to environment. In this paper, we focus on Acacia tortilis trees in savanna to understand their responses to herbivore attacks both in terms of architecture and allocation pattern. Measurements were carried out in Hwange...
A tri-trophic, physiological and ecological based ecosystem model is developed. It considers ecological processes of different development stages of insect pests and auxiliary insects. One of the ecological components in ecosystems, plant, is simulated using the functional-structural plant growth model GreenLab, and the population dynamics of insect pests and auxiliary insects are simulated by a dynamic...
A class of models that may be used to quantify the effect of size-asymmetric competition in crowded plant communities by estimating a community specific degree of size-asymmetric growth for each species in the community is suggested. The model consists of two parts: an individual size-asymmetric growth part, where growth is assumed to be proportional to a power function of the size of the individual,...
A two-dimensional coupled hydrodynamic-ecosystem model is developed to simulate biological processes in Bohai Bay. The biological sub-model describes the carbon cycles through the microbial loop with eight state variables: phytoplankton, zooplankton, bacterioplankton, pelagic detritus, dissolved organic carbon, dissolved organic nitrogen, ammonium and nitrate. In this paper, the seasonal changes of...
An ecosystem can be viewed as an energy flow system in which various species are connected by energy flows along food web links. To understand the co-evolution of the fast dynamics of energy flows and slow dynamics of food web structure, a simple reaction diffusion equation is presented in this paper. Some statistical indicators such as total system throughflow (TST) and Shannon entropy are designed...
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