贵州省贵阳市云岩区耕地质量地球化学调查评价及特色耕地分布特征研究

以硅酸钠提供硅源，铝酸钠提供铝源，通过一步水热法成功合成出具有典型立方体形状的KA分子筛。通过粉末X射线衍射仪，傅里叶变换红外光谱仪，扫描电子显微镜，透射电子显微镜，热重分析和N2吸附-脱附技术详细表征了KA分子筛。研究结果表明：KA分子筛的晶体结构属于体心立方结构，KA分子筛是多晶体；KA分子筛的硅铝物质的量比为1.0∶1；KA分子筛的BET（Brunauer-Emmett-Teller）比表面积是36.783 m2/g，微孔比表面积是24.399 m2/g，微孔体积是0.053 cm3/g。另外，通过对KA分子筛的热稳定性研究，得出2个结论：KA分子筛的相转变温度约是500 ℃，KA分子筛的总质量损失为15.1％。

Geochemical Investigation and Evaluation of Cultivated Land Quality Indicating Significance for Featured Cultivated Land in Yunyan District, Guiyang City, Guizhou Province

The geochemical survey and evaluation of cultivated land quality in Yunyan District takes the second land survey map spots of Guizhou Province as the evaluation units, which are based on the maintenance (application) subsystem platform of Arcgis 10.2 and geochemical survey and evaluation data and cover from cultivated lands, garden lands to naked lands,etc, its area 12.43 km2, involving cultivated land areas 7.07 km2. A total of 82 samples of various media were collected in the studying area. The sampling density of topsoil was 9.05 spots per square kilometer of cultivated land. According to the element geochemical composition and content in cultivated soil, it evaluate and divide soil nutrients of cultivated land, and whose comprehensive grades of Geochemistry. It was found that the cultivated land rich in selenium and germanium was 7 430 mu and 6 000 mu respectively.