福州滨海地区菜地和果园土壤碳、氮、磷含量及其生态化学计量学特征

不同农业土地利用方式土壤生态化学计量学特征对于表征土壤养分供应水平具有一定的指示作用，对农田生态系统养分资源管理具有重要意义.为了揭示菜地和果园两种农业土地利用方式土壤碳(C)、氮(N)、磷(P)含量及其生态化学计量学特征，以福州市滨海地区菜地(芋头地、红薯地)和果园(橘树园、西瓜地、梨树园)为研究对象，对菜地和果园农业土地利用方式下土壤C、 N、 P含量及其生态化学计量特征进行测定与分析.结果表明，土壤C、 N含量基本表现为果园>菜地(P<0.05),其中橘树园土壤C含量最高(4.44 g·kg^-1),西瓜地土壤N含量最高(1.46 g·kg^-1).而土壤P含量基本表现为菜地>果园(P<0.05),其中红薯地土壤P含量最高(0.19 g·kg^-1);土壤碳氮比(C/N)、碳磷比(C/P)和氮磷比(N/P)均表现为果园>菜地(P<0.05),其中，橘树园土壤C/N(7.40)、 C/P(61.43)最高，西瓜地土壤N/P最高(10.27);不同农业土地利用方式下土壤N含量与容重和电导率...

Characteristics of Soil Carbon, Nitrogen, Phosphorus, and Ecological Stoichiometry in Vegetable Fields and Orchard in the Coastal Area of Fuzhou

The soil ecological stoichiometric characteristics of different agricultural land use types have a certain indicator function for characterizing the level of soil nutrient supply and are of great significance to the management of nutrient resources in farmland ecosystems. In order to reveal the soil carbon (C), nitrogen (N), and phosphorus (P) contents and their ecological stoichiometric characteristics in different vegetable fields and orchard agricultural land use types, this study took vegetable fields (taro field and jicama field) and orchards (citrus tree orchard, watermelon field, and pear tree orchard) as the research objects in the coastal area of Fuzhou City. The contents of soil C, N, and P and their ecological stoichiometric characteristics in different vegetable fields and orchard agricultural land uses were measured and analyzed. The soil C and N contents were in the order of orchard>vegetable field (P<0.05). The C content in the citrus tree orchard was the highest (4.44 g·kg^-1), and the N content in the watermelon field was the highest (1.46 g·kg^-1). The soil P content was vegetable field>orchard (P<0.05), and the jicama field had the highest P content (0.19 g·kg^-1). The soil carbon and nitrogen ratio (C/N), carbon and phosphorus ratio (C/P), and nitrogen and phosphorus ratio (N/P) were orchard>vegetable field (P<0.05). Among them, the citrus tree orchard had the highest C/N (7.40) and C/P (61.43), and the watermelon field had the highest N/P (10.27). Soil N content was significantly and negatively correlated with bulk density and conductivity (r=-0.49, r=-0.28, P<0.05), and there was a significant and positive correlation with soil water content (r=0.61, P<0.05). C/P and C/N were significantly and positively correlated with SOM (r=0.71, r=0.64, P<0.01). In the process of crop planting and management in the coastal area of Fuzhou City, it is necessary to reasonably add nitrogen fertilizer to compensate for the N limitation, and slow-release nitrogen fertilizer is better for promoting the sustainable supply of nitrogen nutrients in the growth and development of crops.