Study On The Evolution Of Land Main Ecological Service Function Of Zhenglanqi

The function of ecosystem services is the foundation of human existence and modern civilization,because humans have insufficient understanding of the functions of ecological services,leading to people's massive destruction and exploitation of ecological resources,which seriously affects the ecological service functions of the land.In recent years,although the sandification of Zhenglanqi has improved,it is still in a serious state of desertification.Ecological phenomena such as soil erosion and weathering erosion have occurred from time to time.The ecological environment is still not optimistic,which directly affects the lives of local people and restricts The development of Zhenglanqi agriculture and animal husbandry.In order to make the local economy stable and healthy,the ecological environment of the region has received more attention and attention.This paper uses the CASA model,2005,2010 and 2015 three remote sensing images,DEM data,and related meteorological data.After ENVI and Arc Gis process the impact and related data,extract the relevant index and complete the corresponding calculation.Vegetation net primary productivity(NPP)can reflect the material and energy cycle processes of terrestrial ecosystems.The net primary productivity of Zhenglan Banner In 2005,the average NPP value was 131.08 g C/m~2/a.In 2010,the static primary productivity of vegetation in the study area was slightly lower than that in 2005,and the average NPP in the study area dropped to the level of 123.76 g C/m~2/a.Compared with 2010,the NPP value of Zhenglanqi has increased in 2015,and the average NPP of the entire study area has risen to 141.08.Water conservation function: Water conservation is one of the main service functions of natural ecosystems.The water conservation function of ecosystems is to provide more high-quality water resources for ecosystems and humans by intercepting precipitation,suppressing evaporation,increasing runoff and purifying water quality.During the 10 years from 2005 to 2015,the change of the water conservation index of Zhenglanqi was basically flat and slightly decreased,with an average of-0.743.The rising area is mainly distributed in the western boundary and northeast part of Qixian County.The area accounts for 21.03% of the area of Quanqi County,the area is 1351.28km~2,and the area of the falling area is 78.97%,with the interval of-1~0 and-2~0.The area ratio is the largest,respectively 24.26% and 37.66%,and the proportion of other interval values is relatively small.Zhenglanqi has a low level of water conservation.Wind-proof and sand-fixing function: The largest increase in 2005-2010,a total increase of 965.66 km~2;in 2015,the wind-proof and sand-fixing capacity of Zhenglanqi was generally lower than that in 2010,and the average wind-proof and sand-fixing capacity index decreased from 0.84 in 2010.It is 0.67.Except for the 0-0.25 and 0.5-1.0 two wind-proof and sand-fixing capacity index areas,the land area has been greatly improved,and the other other wind-proof and sand-fixing capacity index segments have shown a downward trend.The positive blue flag wind and sand fixing capacity is at a medium level.