不同比例砒砂岩添加对沙土中碳氮含量的影响
Effects of Different Proportions of Soft Rock Addition on Carbon and Nitrogen Contents in Sandy Soil

本研究主要以砒砂岩与沙复配比小区为基础，选择砒砂岩与沙体积比分别为0:1 (CK)、1:5 (C1)、1:2 (C2)和1:1 (C3)的四个处理，主要分析其碳氮比(C/N)的分布特征。结果表明，土壤有机碳随着土层深度的增加而降低，平均值介于3.10~3.53 g？kg？1之间，0~10 cm土层复配比处理有机碳含量显著高于CK处理且以C3处理最高(P < 0.05)。在10~20 cm土层和20~30 cm土层中，所有处理下的有机碳含量均无显著差异。全氮平均值介于1.52~1.90 g？kg？1之间，平均以C3处理含量最高，且10~20 cm土层全氮含量最大。10~20 cm土层全氮含量显著高于0~10 cm和20~30 cm土层。C/N在0~10 cm、10~20 cm和20~30 cm土层的范围分别为1.58~3.53、1.41~2.85和1.49~2.49，平均以0~10 cm土层C/N最高且显著高于其他土层，20~30 cm次之，10~20 cm最低。C3处理平均值低于其他处理。因此本研究得出砒砂岩与沙体积比为1:1时可增强微生物的降解作用，促进0~10 cm表层土壤碳氮的积累。
This study was based on the soft rock and sand complex ratio test plots. The four treatments of soft rock to sand volume ratios of 0:1 (CK), 1:5 (C1), 1:2 (C2) and 1:1 (C3) were selected, and the carbon-nitrogen ratio (C/N) was mainly analyzed. The results showed that the soil organic carbon decreased with the increase of soil depth, and the organic carbon content of each compound ratio treatments in the 0 - 10 cm soil layer was significantly higher than that in the CK treatment. The results show that soil organic carbon decreases with the increase of soil depth, and the average value is between 3.10 - 3.53 g？kg？1. The organic carbon content of 0 - 10 cm soil layer compounding treatment was significantly higher than that of CK treatment and the highest treatment with C3. There was no significant difference in the organic carbon content of all treatments in the 10 - 20 cm soil layer and the 20 - 30 cm soil layer. The average value of total nitrogen was between 1.52 - 1.90 g？kg？1 and the total nitrogen content in 10 - 20 cm soil layer was the largest. The total nitrogen content in the 10 - 20 cm soil layer was significantly higher than that in the 0 - 10 cm and 20 - 30 cm soil layers. The range of C/N in the 0 - 10 cm, 10 - 20 cm and 20 - 30 cm soil layers is 1.58 - 3.53, 1.41 - 2.85 and 1.49 - 2.49, respectively. The average C/N of 0 - 10 cm soil layer is the highest and significantly higher than other soil layers, 20 - 30 cm, and 10 - 20 cm lowest. The average C3 treatment is lower than other treatments. Therefore, this study shows that the ratio of soft rock to sand volume was 1:1, which can enhance the degradation of microorganisms and promote the ac-cumulation of carbon and nitrogen in the surface soil of 0 - 10 cm.