[Spatial-temporal evolution of ecological land and influence factors in Wuhan urban agglome-ration based on geographically weighted regression model].

Ecological land is essential to sustainable development of urban agglomeration. Based on the results of remote sensing image interpretation, we analyzed the spatial-temporal evolution of ecological land in 32 research units of ecological land in Wuhan urban agglomeration in 2000-2005, 2005-2010 and 2010-2015, using the land use transition matrix, exploratory regression analysis, the ordinary least squares (OLS) model, and geographically weighted regression (GWR) model. Then, the best regression model was selected after perfecting the traditional index system of influencing factors by data of the location and quantitative information of companies, enterprises and life services, etc.

[Review of CO and CH Emissions from Rivers].

Streams and rivers play a major biogeochemical role in the global carbon cycle and act as hot spots for carbon dioxide (CO) and methane (CH) emissions to the atmosphere, excepting their roles of transporting the water and carbon from the terrestrial environment to the ocean. While carbon gases have been of great global concern, systematic reviews are still scarce. Given recent recognition of the pervasiveness of CO and CH in streams and rivers, this study synthesized existing research and discoveries to identify patterns and controls for riverine CO and CH, knowledge gaps, and research opportunities.

[Phenological characteristics of introduced Polygonum viviparum from high altitude to low altitude area].

Objective: To explore the phenological characteristics of Polygonum viviparum introduced from high altitude to low altitude area.

Methods: To introduce the root and seed of Polygonum viviparum from high altitude to low altitude area and collect their growth and phenological data.

Results: In low altitude area, Polygonum viviparum germinated at the beginning of March, grew from March to the end of July, withered during the whole August due to high temperature, recovered from the end of August to the beginning of October, and then withered again due to low temperature.