生态环境学报Issue(3)：444-451,8.
广东省耕地土壤有效磷时空变化特征及影响因素分析
Space-temporal variation of farmland soil AP in Guangdong province and their causing factors
摘要
Abstract
In order to investigate the evolution of farmland soil available phosphorus (AP) since the 1980s in Guangdong province, south China, the space-temporal variation of farmland soil AP was analyzed using long-term monitoring data and the main monitoring point data of farmland. The results showed that the overall level of farmland soil AP increased by nearly 4 times since 1984, with an increase of 1.2 mg·kg-1 annually. In all the monitoring points, AP content that higher than 20 mg·kg-1, increased from 10.8%in the period of 1986~1990 to 66.6%in the period of 2006~2010. However, AP content that lower than 10 mg·kg-1, reduced from59.6%to10.4%in the same period. AP content in the soil had changed from deficit to sufficient. The space-temporal variation of farmland soil AP indicated that the differences of AP among different regions decreased first and then increased. The variation rate of farmland soil AP is different among different regions. The fastest growth of soil AP was found in the Pearl River Delta and Western regions, with an average annual rate of 1.72 mg·kg-1 and<1.69 mg·kg-1 respectively. Slower growth of soil AP was found in Northern and Eastern regions, with an average annual rate of 1.08 mg·kg-1 and 0.74 mg·kg-1 respectively. Extensive application of P fertilizer was the main reason for the overall level of soil AP in Guangdong province. The farmland soil AP content was affected by the fertilization methods significantly. In Zengcheng city, where organic-inorganic P fertilizer was used for 10 consecutive years, the soil AP content was increased by 222%. According to the correlation between the average content of soil AP and the average inputs of P nutrient, 0.8 mg·kg of soil AP was accumulated when 100 kg·hm-2 P fertilizer was applied and 5.3 mg·kg of soil AP was accumulated when a surplus of 100 kg·hm-2 P nutrient. The adjustment of planting structure and the physicochemical properties of soil also have important influences to the Space-temporal variation of farmland soil AP. There were 34.4%farmlands pose a serious threat to the surrounding environment because the accumulation of soil P.关键词
广东/耕地土壤/有效磷/时空变化/影响因素Key words
Guangdong/farmland soil/AP/space-temporal variation/influencing factors分类
农业科技引用本文复制引用
曾招兵,曾思坚,汤建东,刘一锋,张满红..广东省耕地土壤有效磷时空变化特征及影响因素分析[J].生态环境学报,2014,(3):444-451,8.基金项目
农业部耕地质量保护项目资金项目；广东省粮食专项资金项目 （）
