Research For Climatic Factors And Vegetation Changes And Their Response Relationships In Horqin Sandy Land

Horqin sandy land is Chinese typical of the sandy desertification, the problem is outstanding especially on ecological environment The climate and vegetation change has certain model and representativeness. To study the climate factors and vegetation’s changes and their response to eachother has Practical reference value for Rational Utilization of Water Resourc, Ecological Environment Construction and Improve, Regional Economicand Social development in the study areas.In this paper, based on covered the study area and the surrounding areas of 27 meteorological stations from 1951 to 2012 meteorological data, from 2000 to 2012 Normalized Difference Vegetation Index (NDVI) data, used Regression Analysis,5 Year Moving Average, Climate Tendency Rate and Productivity Test, Maximum synthetic (MVC), Dimidiate Pixel Model, Simple and Partial Correlation Analysis method and so on like that method to analysis the change characteristics and rules of many years climate factor, NDVI, and their relation that response to eachothers qualitative and quantitative in.the the study area. The main conclusions were as follows:1. The regional average annual(season) precipitation change not significantly (annual: 6.913mm/10a) in the past 62 years. The annual(season) precipitation change with wetting drying alternation. The space annual temperature centered KaiLu, TongLiao to low in west and east direction, from northwest to southeast increase. The annual precipitation reduced rate fastly in some area’s from 1951 to 1982 that reduced rate become slowly from 1983 to 2012.2. The regional average annual(season) maximum, (years:0.223℃/10a), average (year: 0.319℃/10a), minimum (0.525℃/10a) temperature has increased, and become abrupt change in the 1981 -1987,1981-1994,1985-1999 in turn. Winter, spring, autumn and summer abrupt change in turn. Temperature in spring, minimum temperature, before the abrupt change of the minimum temperature (0.50℃/10a) in spring, after the abrupt change of the maximum temperature in autumn(0.75℃/10a), are the largest contribute to temperature rise. Seasonal order of incremental mean temperature value for many years before andafter abrupt change is opposite to their incremental climate tendency rate.The space annual temperature increased gradually from north to south. Annual maximum and average(minimum) temperature’s climate tendency rate from west to East, from north to south decreased gradually respectively. Annual minimum temperature increasing significant abrupt change increased by 6.79% compared with their before abrupt change. Annual(summer) precipitation and temperature has a relationship in stage character symmetric relation, precipitation and the maximum, average, minimum temperature’s symmetry become weaken in turn.3. The vegetation growth show a good trend in general, the area of deteriorated accounted for 28% of the research area, the NDVI value is below 0.60, Bare land and Low coverage vegetation showed decrease, and the vegetation growth of the remained area showed ameliorated trend. High coverage vegetation’s area is the largest, accounted for 52.90% in 2012. Vegetation change rate for many years is contrary to the growth of vegetation from April to August.4. Perennial vegetation grew well with NDVI. The vegetation growth was influenced greatly by 2-3 months accumulated precipitation, the temperature of the month and average temperature of 2-3 months. The vegetation growth was promoted by precipitation increment, temperature rising during April to November, the lowest temperature increment in April, as well as the highest or the average temperature decrease from June to August. When NDVI was0.23～062, the vegetation growth was influenced positively by precipitation, when NDVI was 0.03-033 and 0.43-0.53, it was influenced positively by temperature, when NDVI was above 0.53, it was influenced by average and maximum temperature negatively. NDVI responded to the changes of precipitation or temperature. For example, When the precipitation, maximum, average, minimum temperature change in 104.90～159.38mm,18.68～25.58℃,24.96～32.04℃,12.65-19.81℃, NDVI response to 0.43～0.53. Precipitation increased promote most of the area of vegetation growth; from April to August,the area is largest when maximum temperature rise combined action of precipitation and temperature could inhibit vegetation growth, when minimum temperature rise action of temperature alone could inhibit vegetation growth.5. Semi-fixed Sandy land positive responded to precipitation in April and June, negative responded to average temperature from May to July. Fixed Sandy land and Grassland positive responded to precipitation, negative responded to average temperature from June to July.6. Impacts of climate change on vegetation greater than the impact of human activities, the relative role of human activities in June was the largest, accounting for 13.2%.