Methods of soil organic and inorganic phosphorus fractionation in karst areas

• Published in: Journal of agricultural resources and environment 2019-07, Vol.36 (4), p.462
• Main Authors: Meng-Jun, Chen, Ying-Ge, Shu, Sheng-Yang, Xiao
• Format: Article
• Language: Chinese
• Subjects: Biological effects; Chemical properties; Correlation analysis; Fractionation; Grasslands; Karst; Land use; Methods; Organic chemistry; Organic phosphorus; Organic soils; Phosphorus; Phosphorus content; Science; Soil analysis; Soil sciences; Soils; Water conservation; Woodlands
• ISSN: 2095-6819; 2095-6819
• DOI: 10.13254/j.jare.2018.0279

为精准测定各形态磷含量，分析各形态磷对有效磷的贡献率，进而评价土壤的供磷能力，以贵州省晴隆县喀斯特地区草地、林地、耕地3种土地利用方式下土壤为研究对象，采用蒋柏藩-顾益初无机磷分级方法、Bowman-Cole有机磷分级方法和Tiessen-Moir有机无机磷结合分级方法进行比较研究。结果表明：各方法测定的土壤有机无机磷含量在不同土地利用方式下差异明显。综合各样地分析发现，采用蒋柏藩-顾益初法和Tiessen-Moir法测定的土壤无机磷形态含量相差不大，无机磷总量占全磷比例分别为20.13%和22.38%。采用Bowman-Cole法和Tiessen-Moir法测定的土壤有机磷含量占全磷比例相差较大，二者相差4.99个百分点，Bowman-Cole法测定土壤有机磷总量高于Tiessen-Moir法。各方法测定土壤有机无机磷形态含量与有效磷含量相关性分析表明，研究区采用蒋柏藩-顾益初土壤无机磷分级方法与Bowman-Cole有机磷分级方法更具代表性。综合考虑土壤有机无机磷的实际含量、各形态磷的化学性质及其生物有效性，研究区采用蒋柏藩-顾益初提出的土壤无机磷分级方法比较适合，Bowman-Cole提出的土壤有机磷分级方法较Tiessen-Moir法更适合于研究区土壤有机磷的分级。 The scientific method of soil phosphorous fractionation can accurately determine the pool of phosphorus in each form, analyzing the rate of contributions about the phosphorus in the form of available phosphorus, it can evaluate the phosphorus supply capacity of soil. In this study, soils of three land use patterns including grassland, woodland and cultivated field from the karst area of Qinglong County, Guizhou Province were examined using the methods of Jiang-Gu on soil in