陕西葡萄酒产区土壤理化特征与综合肥力评价OA

In order to understand the status of soil nutrients in Shaanxi wine producing areas,soil samples at three depths of 0-20,20-40 and 40-60 cm were collected from 17 wineries in four wine subregions of Northern Shaanxi Plateau,Weibei Dryland,Guanzhong Plain and Southern Shaanxi Mountains.The differences of soil physical and chemical characteristics and nutrient fertility status were analyzed.The comprehensive soil fertility status of different producing areas was evaluated by membership function and principal component analysis.The results showed that the average soil bulk density in Shaanxi wine producing area was greater than 1.50 g·cm-3,and showed a trend of low in the south and high in the north.The soil of the northern Shaanxi plateau subregion is alkaline,the proportion of sand is more than 80%,and the texture is sand.The soil in the Guanzhong Plain subregion is neutral,the rest of the production area is weakly alkaline,and the texture is loam.The soil nutrient status in Shaanxi wine producing areas was significantly different from north to south,mainly showing a trend of increasing first and then decreasing from north to south.The areas with surface soil organic matter,total nitrogen and total phosphorus reaching grade 3 and above accounted for 45.10%,62.74%and 54.90%,respectively,and most of the deep soil was in nutrient deficiency.The potassium content is relatively rich as a whole.The comprehensive soil fertility index was as follows:Guanzhong Plain＞Southern Shaanxi Mountains＞Weibei Dryland＞Northern Shaanxi Plateau.Soil total nitrogen and organic matter are the main limiting factors of soil fertility.