| 基于生物有效性的农田土壤磷素组分特征及其影响因素分析 |
| 摘要点击 2323 全文点击 1124 投稿时间：2016-08-25 修订日期：2016-10-30 |
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| 中文关键词 磷素分级 生物有效性 环境因子 旱地土 水田土 |
| 英文关键词 phosphorus fractionation bio-availability environmental factors upland soil paddy soil |
| 作者 | 单位 | E-mail | | 蔡观 | 湖南农业大学生物科学技术学院, 长沙 410128
中国科学院亚热带农业生态研究所公共技术服务中心, 长沙 410125 | caiguan1992@163.com | | 胡亚军 | 中国科学院亚热带农业生态研究所, 农业生态系统过程重点实验室, 长沙 410125 | | | 王婷婷 | 中国科学院亚热带农业生态研究所, 农业生态系统过程重点实验室, 长沙 410125 | | | 袁红朝 | 中国科学院亚热带农业生态研究所公共技术服务中心, 长沙 410125
中国科学院亚热带农业生态研究所, 农业生态系统过程重点实验室, 长沙 410125 | | | 王久荣 | 中国科学院亚热带农业生态研究所公共技术服务中心, 长沙 410125
中国科学院亚热带农业生态研究所, 农业生态系统过程重点实验室, 长沙 410125 | | | 李巧云 | 湖南农业大学生物科学技术学院, 长沙 410128 | 1753994368@qq.com | | 葛体达 | 中国科学院亚热带农业生态研究所, 农业生态系统过程重点实验室, 长沙 410125 | | | 吴金水 | 中国科学院亚热带农业生态研究所, 农业生态系统过程重点实验室, 长沙 410125 | |
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| 中文摘要 |
| 适宜的磷素分级方法是研究磷素组分特征与评价其有效性的关键.以磷素的化学与生物活化特点，采用改进的生物有效性的磷素分级方法，应用其研究不同土地利用方式下旱地土与水田土中磷素组分与有效磷（Olsen-P）的关系，并分析环境因子对磷组分的影响.磷素分级方法将磷素分为4个组分：①自由扩散或根际截留的磷（CaCl2-P）；②有机酸活化和无机弱结合磷（Citrate-P）；③系列酶矿化的有机磷（Enzyme-P）；④潜在活化的无机磷库（HCl-P）.结果表明，旱地土及水田土4种磷素组分含量均表现为：HCl-P > Citrate-P>Enzyme-P > CaCl2-P，且旱地土各磷组分均显著高于水田土.Olsen-P与各磷素组分均呈显著正相关，表明各磷素组分对有效磷都有贡献.具体表现为：在旱地土中，Olsen-P与CaCl2-P和Enzyme-P相关性较高（R2=0.359；R2=0.386）；在水田土中，Olsen-P与Citrate-P相关性较高（R2=0.788），说明旱地土中有效磷主要来自土壤自由扩散的无机磷和易矿化的有机磷部分，而水田土中有效磷主要来自弱酸活化的无机磷.冗余分析结果表明，磷素组分主要受土壤pH和黏粒含量的影响，指示在农业生产活动中，可通过调节土壤pH值，提高土壤有效磷含量. |
| 英文摘要 |
| A suitable fractionation method of phosphorus (P) is a key to effective assessment of soil P componential features. Here a new biologically-based P (BBP) method was used to evaluate the P fractions in the upland and paddy soils across large-scale area in China. The soil P was divided into four components:① soluble or rhizosphere-intercepted (CaCl2-P), ② organic acid activated and inorganic weakly bound (Citrate-P), ③ enzyme mineralization of organic P (Enzyme-P), ④ potential activation of inorganic P (HCl-P). Then, the relationships between biologically-based P fractions and standard Olsen-P were investigated, and driving factors of P fractions were identified. The results showed that P content was in order of HCl-P>Citrate-P>Enzyme-P>CaCl2-P. All P components of upland soil displayed higher levels than those of paddy soil. Moreover, the P components were highly positively correlated with the Olsen-P, suggesting that each P component contributed to soil P availability. However, it was found that Olsen-P was most highly correlated with CaCl2-P and Enzyme-P (R2=0.359; R2=0.386) in upland soil, while Olsen-P was most highly with Citrate-P (R2=0.788) in paddy soil. This result indicated that available P of upland soil was mainly from organic P mineralization and soluble P, and available P in paddy soil was mainly from inorganic P activation. Redundancy analysis (RDA) showed that the P components were mainly affected by soil pH and silt content, which suggested that it could enhance the P availability via regulating soil pH in the agricultural activities. |
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