关键词: 16S rDNA PCR-RFLP分析, 16S rDNA PCR-RFLP分析

Abstract: This study was to systematically comprehend soil quality status in coastal region of Hebei Province, and acquire management measures to improve soil quality. With the application of fuzzy synthetic evaluation method and GIS technology, fuzzy synthetic evaluation and classification of regional soil quality was conducted, and spatial patterns of synthetic evaluation results of regional soil quality was obtained. The results indicated that, soil quality status of farmland across the study area was generally low, soil organic matter and N nutrient was low, available phosphorus and quick-acting potassium were abundant, content of total salt was up to the standard of medium saline soil, groundwater depth was shallower and degree of mineralizations was higher. Soil salinity, groundwater mineralization and depth were limiting factors of soil quality. Soil quality status differed significantly at different administrative region of the study area, coefficient variation of pH value was the smallest, while coefficient variation of total salt content was the biggest, the spatial pattern of soil quality was similar to that of total salt content. The region of poor soil quality was in the Middle East of Cangzhou coast and south of Tangshang coast, which the area occupied 5.3% of total farmland in the study area. The soil quality map can be used for the improvement of moderate-and-low-yield farmlands, comprehensive treatment of saline-alkali soil in our study area. The pattern of ladder second advance should be taken, which firstly halophytes were planted, then economic plants. Soil quality was improved through gradual improvement of the physicochemical properties of soil. Comprehensive mastering soil quality status of the area should provide a theoretical reference to improvement and scientific distribution of alkaline land in coastal region of Hebei Province.