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'https://openalex.org/W3004350917', 'https://openalex.org/W2555538250', 'https://openalex.org/W2495625245', 'https://openalex.org/W2469656855', 'https://openalex.org/W2412772269', 'https://openalex.org/W2390603273', 'https://openalex.org/W2384048323', 'https://openalex.org/W2354056138', 'https://openalex.org/W2348194275', 'https://openalex.org/W2347211908', 'https://openalex.org/W2337571210', 'https://openalex.org/W2332530180', 'https://openalex.org/W2211343424', 'https://openalex.org/W2146570701', 'https://openalex.org/W2013444386', 'https://openalex.org/W2001385520'], 'abstract_inverted_index': {'通过对中国农业大学曲周试验站所在地土壤质地和土壤容重的测定分析,研究华北冲积平原曲周地区的农业土壤容重空间变异性.结果显示,研究区域土壤客重的空间变异情况复杂,无确定的变化规律;壤质类土壤的容重值为(1.55±0.09)g/cm3,砂质类土壤的容重值为(1.43±0.16)g/cm3,粘质类土壤的容重值为(1.54±0.07)g/cm3,粘砂交错层的土壤容重值为(1.47±0.12)g/cm3,土壤呈紧实趋势.土壤质地不均匀分布是引起土壤容重变化的关键因素.': [0]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2872274677', 'counts_by_year': [], 'updated_date': '2024-09-19T14:28:44.785968', 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