Study On Fertility Status Of Tobacco-planting Soils At Elevation Height In Tobacco-planting Area Of Zhangjiajie

In order to reveal the changes in tobacco soil fertility and its relationship with the altitude difference in soils tobacco-planting area in Zhangjiajie, clear vegetation at different altitudes and soil fertility status of tobacco-planting use soil, using GPS technology, acquisition representative of25soils tobacco-planting area in Zhangjiajie to study the physical, chemical and biological properties of soil fertility and the main results are as follows:1, Different elevation height tobacco soils sand proportion with the increase of the percentage of elevation height was gradually increased; Percentage of clay percentage increases with elevation height gradually decreased; Percentage of silt percentage increases with elevation height change significantly. The following paragraph450m above sea level to the highest clay content, soil texture heavier; Segment elevation800m above the highest sand content, soil texture lighter.2, Soil pH, available phosphorus, slow potassium, exchangeable Ca with increasing altitude was gradually decreased, organic matter, nitrogen, exchangeable Mg with increasing elevation height increased and then decreased after the first show, potassium, sulfur effectively increases with elevation height was gradually rising trend, total nitrogen, total phosphorus, total potassium, water-soluble chloride no significant changes with elevation height law.3, Soil organic carbon content, carbon content of humic acids, decimating the amount of carbon acids, humin carbon volume at450-800m above sea level the highest segment; Fulvic acid percentage of the total carbon content increases with elevation height was gradually rising trend, an increase of9.9percentage points, percentage of the total carbon content of humin and HA/FA increases with elevation height was gradually decreased; As the elevation height increases, humic acid and organic matter, total nitrogen, nitrogen correlation has been strengthened, and the related changes humin and organic matter, total nitrogen obvious..4, Organic nitrogen components, acid hydrolysis nitrogen, ammonia nitrogen, amino nitrogen, unknown nitrogen content with increasing elevation height were decreased gradually, amino sugar nitrogen content increases with elevation height was gradually rising trend, acid-insoluble nitrogen content increased first decreasing. Amino nitrogen, nitrogen unknown percentage share of total nitrogen increases with elevation height gradually decreased; Ammonia nitrogen to total nitrogen percentage increases with elevation height reduces upward trend after the first amino sugar nitrogen, acid-insoluble nitrogen to total nitrogen percentage increases with elevation height was gradually rising trend.5, Total microbial population, microbial biomass carbon increases with elevation height gradually decreased, microbial biomass nitrogen increases with elevation height decreased first rising trend. Among them, bacteria and fungi with increasing elevation height increased first decreased, actinomycetes increases with elevation height was gradually decreasing trend.