Threshold Values on Phosphorous Leaching of Vegetable Soils in Fuzhou
-
摘要: 以福州郊区蔬菜地土壤为研究对象,通过室内模拟试验,研究6种不同土壤测试磷(Olsen-P、CaCl2-P、H2O-P、NaOH-P、Bray-P、有机磷)含量与磷素淋失之间的关系,探讨土壤磷素淋失风险评估的指标。结果表明,CaCl2-P、有机磷与淋洗液溶解总磷(DTP)的当次释放量及其累积量具有极显著的相关关系,可作为评价蔬菜地土壤磷淋失风险的指标,以DTP 0.05 mg·L-1作为引起水体富营养化的临界值,获得本试验区域蔬菜地土壤磷素淋失的CaCl2-P、有机磷阀值分别为14.1 mg·kg-1和205.8 mg·kg-1;以Hesketh2000年提出的"突变点"方法预测土壤磷素淋失风险,得出本试验区域蔬菜地土壤磷发生淋溶的Olsen-P"突变点"为96.6 mg·kg-1。Abstract: Surface soils of vegetable plots in Fuzhou suburbs were sampled for this study. A simulated continuous leaching test on the soils was conducted to examine the soil-water phosphorus correlation. The results clearly indicated that CaCl2-P and organic P in the soil correlated very significantly to the concentration and accumulation of dissolved P (DTP). Thus, CaCl2-P and organic P were considered excellent indices for the risk evaluation on soil phosphorus leaching. At DTP concentration of 0.05 mg L-1 as the critical value for eutrophication, the CaCl2-P and organic P threshold values for phosphorus leaching in vegetable soils were 14.1 mg穔g-1 and 205.8 mg穔g-1, respectively. According to Hesketh (2000), the "change-point" concentration of the Olsen-P for the vegetable soils was determined to be 96.6 mg穔g-1.
-
Key words:
- Vegetable soils /
- phosphorus /
- leaching /
- threshold value /
- change-point concentration
-
[1] 徐爱兰,王鹏.太湖流域典型圩区农田磷素随地表径流迁移特征[J].农业环境科学学报,2008,27(3):1106-1111. [2] 李学平,邹美玲.农田土壤磷素流失研究进展[J].中国农学通报,2010,26(11):173-177. [3] 邬伦,李佩武.降雨产流过程与氮磷流失特征研究[J].环境科学学报,1996,16(1):111-116. -
点击查看大图
计量
- 文章访问数: 2438
- HTML全文浏览量: 59
- PDF下载量: 418
- 被引次数: 0
下载:
