The Research On Land Use Ecological Efficiency In Jianghan Plain

As a vital input production factor,land is combined with key elements such as labor and capital to get agricultural outputs?crops,fruit,etc.?.In recent years,the fast-growing population accelerates agriculture product demand which increases the land intensity dramatically.Meanwhile,land which is an important ecological space also conveys every ecological process.However,we are ignoring the ecological part of land use function due to the incomplete land use efficiency theory,resulting in the rising conflict of the relationship between human and land.Therefore,this dissertation will discuss the land us of ecological efficiency theoretically from human and nature dimension,which can provide the vital theoretical value of land productivity.The main research content of this dissertation includes:?1?Estimating the net primary productivity of Jianghan plain,calculating the effective harvest net primary productivity and then goes to the human harvest pressure index,which represents for the land use intensity.?2?Calculate the landscape index in Jianghan plain,analysis land use cover changes.?3?Evaluate land use ecological efficiency by using DEAThe main conclusion of this dissertation are demonstrated as follows:?1?NPP in Jianghan plain shows a fluctuate trends in total,NPP in 2000,2010,2015 are 783.7 gC/m²,816.7 gC/m²,766.6 gC/m².The difference of NPP in different land use type are distinct,which demonstrate that of forest land>cultivated land>grassland>unused land.From the spatial distribution perspective,NPP in west outweighs that in east.?2?NPP_eh of forest land and cultivated land both show an upward trend,however,the area of cultivated land keeps decreasing during the research period.Two main transfusion types are from cultivated area to water and cultivated land.Land transition leads to the decrease of NPP,and increase of harvest demand,which makes the HHPI rise up.In 2000,2010,2015,Cultivated land HHPI are20.94%,22.88%,29.18%respectively and forest land HHPI are 7.70%,7.25%,10.86%respectively.?3?From 2000 to 2015,landscape patch number is increasing,the average mean patch area are decreasing which shows the cultivated land fragmentation are increasing.In the spatial scale,patch density in north is higher than that in south.SHDI in the middle area is lower than that in the outside.?4?Half of land use ecological efficiency of the decision making units are below 0.3,the efficiency of decision making units equals 1 occurs in Honghu city.?5?HHPI of cultivated land and landscape diversity changes in the same direction.High HHPI means low potential to get benefit,which leads to the dramatic land use change.It makes the patch density and landscape diversity increase.