{'fraction_non_alphanumeric': 0.018257261410788383, 'fraction_numerical': 0.0, 'mean_word_length': 5.153061224489796, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Spatial heterogeneity of surface soil nutrients in Minqin lake area

By using the methods of geostatistics,the spatial heterogeneity of available N,available P and available K in surface soils in Minqin lake area was studied.The results indicated that soil N and K were rich but soil P was poor over the three landscapes of oasis,desert and transitional belt.The variation coefficient of soil available N and P was the smallest in oasis area and the biggest in desert area,while that of soil available K was the smallest in desert area and the biggest in oasis-desert transitional belt.Soil nutrients in the study area wholly exhibited moderate spatial variability.The soil available N and P presented a U-shaped distribution pattern,and the soil available K presented an inverse U-shaped distribution pattern from oasis to desert.Available N,P and K fitted well to Exponential model,PentaspHerical model and Tetrasherical model,respectively.The enriched zone of available N and P was located in oasis area,whereas that of available K was located in oasis-desert transitional belt.The soil nutrient contents were related not only to the elements of parent rocks,but also to the impact of human activities.