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不同种植年限设施菜田土壤无机磷组分的累积和释放特征
张大庚, 栗杰, 董越
沈阳农业大学 土地与环境学院, 辽宁 沈阳 100866
摘要:
[目的] 探明设施栽培条件下土壤磷素随种植年限的变化规律,揭示温室土壤无机磷积累和淋溶损失的主体成分,为设施农业合理施用磷肥和可持续发展提供依据。[方法] 采集了辽宁省铁岭县(2~28 a)和海城市(2~33 a)不同种植年限的设施土壤,以土壤全磷、有效磷、无机磷组分含量的变化及磷素释放曲线为切入点,分析了设施栽培条件下土壤磷素随种植年限的变化规律。[结果] ①铁岭和海城设施菜田耕层土壤全磷、无机磷和有效磷含量随种植年限的增加均呈先增加后降低的趋势,在种植20 a左右达到峰值。全磷含量为主,最高分别达到了5.76±0.61 g/kg和7.08±0.72 g/kg。②两地设施菜田土壤无机磷以Ca8-P含量高,分别是无机磷总量的34.2%和59.9%,其次为Fe-P和Al-P。Ca8-P含量随种植年限的增加而增加,而Fe-P含量则随种植年限的增加而降低。③设施菜田种植2~15 a左右磷素的释放率与15 a后对比相对较高,释放量与Ca2-P,Fe-P之间的相关性达到显著水平。[结论] 研究区域范围设施菜田土壤磷素积累以Ca8-P形态为主,Ca2-P和Fe-P是磷素淋失的主要形态。
关键词:  种植年限  设施菜田  土壤磷素  累积  释放
DOI:10.13961/j.cnki.stbctb.2021.04.013
分类号:S158.2
基金项目:国家重点研发计划项目“东北寒区设施蔬菜化肥农药减施技术模式建立与示范”(2016YFD0201004)
Accumulation and Release Characteristics of Soil Inorganic Phosphorus Components in Greenhouse Vegetable Fields with Different Planting Years
Zhang Dageng, Li Jie, Dong Yue
College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 100866, China
Abstract:
[Objective] The accumulation and release of inorganic phosphorus in vegetable field soil under the condition of greenhouse cultivation was explored, in order to provide basis for the rational application of phosphorus fertilizer and the sustainable development of protected agriculture. [Methods] The greenhouse soil in Tieling County (2—28 years) and Haicheng City (2—33 years) of Liaoning Province with different planting years was collected. The change of total phosphorus, available phosphorus and inorganic phosphorus in soil and the curve of phosphorus release were taken as the breakthrough point, to analyze the variation of soil phosphorus with different planting years. [Results] ① The total phosphorus, inorganic phosphorus and available phosphorus in topsoil in both of Tieling County and Haicheng City protected vegetation fileds increased first and then decreased with the increase of planting years, and reached the peak at about 20 years after planting, with the highest contents of total phosphorus content reached 5.76±0.61 g/kg and 7.08±0.72 g/kg, respectively. ② Ca8-P was the main content of inorganic phosphorus in surface greenhouse soil, and the highest content was 34.2% and 59.9% of the total inorganic phosphorus, followed by Fe-P and Al-P. Ca8-P increased with the increase of planting years, while Fe-P decreased with the increase of planting years. ③ The release rate of phosphorus was relatively high in the early planting period (about 2—15 years), and the correlation between the release amount and Ca2-P and Fe-P reached a significant level. [Conclusion] The main form of phosphorus accumulation in surface greenhouse soil was Ca8-P, and Ca2-P and Fe-P, were the main forms of phosphorus leaching.
Key words:  planting years  greenhouse soil  phosphorus  accumulation  release