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Based on the land use and land cover changes from 1995 to 2010, the relationship of land use and carbon emissions was estimated, using existing calculate model Change of land use-carbon emissions. The carbon emissions caused by farmland, forest, garden plot, and construction land were estimated, furthermore, the influence of carbon emission was revealed. Finally, the problems that facing G.D. province in the view of carbon reduction was analyzed, and several suggestions was brought out.

The supply of construction land index is difficult in coal villages migration, especially the construction land index in urban and rural, lacking of construction land index becomes the bottleneck of village migration. In order to ruduce the pressure of the contradiction between supply and demand of land used for construction purposes. This paper combines with the actual situation of coal villages, taking Huainan as an example, starting from the connotation and significance of the policy of linking the increase in land used for urban construction with the decrease in land used for rural construction, based on the analysis of the current situation of the city construction land use, making predictions on the potentiality of village land readjustment in coal mining areas, the potentiality of the rural residential areas hook readjustment and the potentiality of linking the increase in land used for urban construction with the decrease in land used for rural construction, the results show that the overall hook potentiality is larger.

Background and Objectives: Patients with unstable intertrochanteric fractures are older, and body function gradually degrades with age. The reduction and fixation of these fractures are difficult. Total hip arthroplasty is one of the main surgical treatments for unstable intertrochanteric fractures in the elderly. This trial was designed to identify the differences between cemented and cementless prostheses in the repair of unstable intertrochanteric fractures in the elderly so as to provide a clinical basis for the selection of hip prostheses for treating unstable intertrochanteric fractures in elderly patients. Design: A prospective, single-center, non-randomized, controlled, clinical trial. Methods: Eighty-six elderly (> 65 years old) patients at the Harrison International Peace Hospital of China with unstable intertrochanteric fractures underwent total hip arthroplasty. Forty-four patients in the control group received a cemented SPII prosthesis (Link, Hamburg, Germany). Forty-two patients in the trial group received a cementless Wagner prosthesis (Zimmer, Spartanburg, SC, USA). All patients were followed for 6 months. Outcome measures: The primary outcome was an excellent or good Harris hip score at 6 months postoperatively to evaluate the recovery of hip function. The secondary outcomes were the changes in Harris hip scores or morphological changes in the hip on X-ray preoperatively and 1, 3, and 6 months after surgery, intraoperative blood loss, operative time, postoperative blood transfusion volume, ambulation time, amount of drainage at the incision 1 month after surgery, and the incidence of adverse reactions at 6 months after surgery. Results: Postoperative blood transfusion volume and the amount of drainage were higher in the trial group than in the control group (P 0.05). Harris scores were lower in the trial group than in the control group at 1 and 3 months postoperatively (P 0.05), but bone cement poisoning was found in four patients in the control group. Conclusion: Efficacy and safety of cemented and cementless prostheses for unstable intertrochanteric fractures in the elderly were good. However, the cemented prosthesis was associated with a risk of bone cement poisoning. Trial registration: Clinical Trails.gov indentifier: NCT03193697.