[Effects of simulated soil warming on the growth and physiological characters of Deyeuxia angustifolia].

By using improved heating cables, a field experiment was conducted to study the effects of 1 degrees C-30 degrees C soil warming on the growth and physiological characters of Deyeuxia angustifolia. Soil warming obviously promoted the growth of D. angustifolia.

[Effects of simulated nitrogen deposition on biomass of wetland plant and soil active carbon pool].

A simulation study was made on the responses of biomass of Deyeuxia angustifolia and soil active carbon pool in Sanjiang Plain of Northeast China to simulated nitrogen deposition. Two water conditions (W1: non-flooded, W2: flooded) and four N treatments (equivalent to 0, 1, 3, 5 g N x m(-2) x a(-1) nitrogen deposition rate) were installed. The results showed that under effects of nitrogen deposition, the total biomass, above-ground biomass, and root biomass of D.

[Effects of urbanization on supply and demand of regional ecological footprint].

Based on the time series of ecological footprint (EF) in Jilin Province from 1994 to 2003, the relationship models of EF, ecological budget, and EF intensity with urbanization level were established. The results showed that in Jilin Province, there existed significant correlations of EF, ecological budget, and EF intensity with urbanization level. Along with the development of urbanization, the EF in the Province increased from 1.