槟榔间作香露兜对土壤养分和养分吸收的影响

Effect of Arecanut and Pandan Intercropping on Soil Nutrient and Nutrient Absorption

为了研究槟榔间作香露兜对土壤养分和养分吸收的影响,采用盆栽试验的方法,对槟榔单作、槟榔间作香露兜和香露兜单作3种种植模式的土壤理化性质和养分吸收进行比较研究。结果表明:槟榔间作香露兜后,相对于单作槟榔,土壤EC值和碱解氮含量显著降低47.15%和25.74%,土壤速效磷含量显著增加32.32%,其中碱解氮与过氧化氢酶和过氧化物酶极显著负相关,速效磷与总根长、根系总表面积、根体积、根数目、脲酶和酸性磷酸酶显著正相关,速效磷与过氧化氢酶和过氧化物酶极显著正相关;槟榔地上部N浓度以及香露兜地上部P和K浓度分别显著增加41.56%、26.56%和25.69%;而槟榔和香露兜根系以及地上部N、P和K养分含量均高于单作,其中根系槟榔P和K含量和香露兜K含量显著增加;同时,间作后槟榔和香露兜对N的吸收效率均高于单作,香露兜的P和K的吸收效率高于单作并略高于槟榔的吸收效率,其中P和K的吸收效率与总根长、总表面积、根体积、根数目均显著正相关,氮的吸收效率与根系形态无显著相关关系。综上所述,槟榔间作香露兜增加了土壤中速效磷含量,促进了槟榔和香露兜对氮、磷和钾养分的吸收,土壤速效磷含量的增加、养分吸收效率的提高均与根系形态显著正相关。

In order to evaluate the effect of arecanut and pandan intercropping on soil nutrient and nutrient absorption,the soil physical and chemical properties,and nutrient absorption of arecanut and pandan were studied in arecanut and pandan monoculture and intercropping system with pot experiment.After arecanut intercropped with pandan,the soil EC value and alkali hydrolyzable nitrogen content of arecanut significantly decreased by 47.15%and 25.74%,and the soil available phosphorus content significantly increased by 32.32%.Available nitrogen was significantly negatively correlated with catalase and peroxidase,and available phosphorus was positively correlated with total root length,total root surface area,root volume,root number,urease and acid phosphatase.There was a very significant positive correlation between available phosphorus and catalase and peroxidase.The concentration of nitrogen in the aboveground part of arecanut and the concentration of phosphorus and potassium in the aboveground part of pandan increased significantly by 41.56%,26.56%and 25.69%.The content of nitrogen,phosphorus and potassium in the roots and aboveground parts of arecanut and pandan was higher than those in monoculture,and the content of phosphorus and potassium in root of arecanut and the content of potassium in root of pandan increased significantly.Meanwhile,after intercropping,the absorption efficiency of nitrogen was higher than those in monoculture,and the absorption efficiency of phosphorus and potassium of pandan was slightly higher than that of arecanut.The absorption efficiency of phosphorus and potassium was significantly positively correlated with total root length,total surface area,root volume,and root number.The absorption efficiency of nitrogen had no significant correlation with root morphology.To sum up,after intercropping,the content of soil available phosphorus increased,and promoted the absorption of nitrogen,phosphorus and potassium by betel nut and pandan.The increase of soil available phosphorus content and the improvement of nutrient absorption efficiency are significantly positively correlated with related to the root morphology.