稻虾共作对土壤有机碳的影响及其与土壤性状的关系

通过田间定位试验,以水稻单作为对照,研究稻虾共作模式对土壤有机碳的影响,采用Pearson(皮尔逊)相关性分析法,探讨稻虾田中土壤有机碳与土壤肥力、土壤酶活力的关系。结果表明:稻虾共作显著(P<0.05)增加了土壤有机质含量,但低C/N饲料投喂组的土壤有机碳含量显著(P<0.05)下降。稻虾共作条件下,土壤全磷、脲酶与有机碳呈显著(P<0.05)正相关,土壤有机质、纤维素酶与有机碳分别呈极显著(P<0.01)和显著(P<0.05)负相关。土壤铵氮与有机质呈显著(P<0.05)负相关,土壤纤维素酶与有机质呈显著(P<0.05)正相关。

Changes of soil organic carbon and relationships with soil properties in rice-crayfish coculture system

A field experiment on rice-crayfish coculture was conducted to assess the influence on soil organic carbon in paddy field with regular rice monoculture as control. Pearson correlation analysis was introduced to explore the relationships within organic carbon, soil fertility and soil enzyme activities. It was shown that rice-crayfish coculture significantly (P<0.05) increased the contents of soil organic matter, but the soil organic carbon contents were significantly (P<0.05) decreased in rice-crayfish coculture with low C/N diet. Under rice-crayfish coculture, soil total phosphorus, soil urease showed significant (P<0.05) positive correlation with soil organic carbon, yet soil cellulose and soil organic matter showed significant negative correlation with soil organic carbon at P<0.01 and P<0.05, respectively. Soil ammonia nitrogen was significantly (P<0.05) negatively correlated with soil organic matter, yet soil cellulose was significantly (P<0.05) positively correlated with soil organic matter.