• ISSN 1008-505X
  • CN 11-3996/S
章文, 王慧, 李敏, 程文龙, 卜容燕, 唐杉, 韩上, 武际, 朱林, 余庆柱. 添加紫云英对稻田土壤颗粒吸附磷酸盐的影响[J]. 植物营养与肥料学报, 2022, 28(8): 1388-1397. DOI: 10.11674/zwyf.2021620
引用本文: 章文, 王慧, 李敏, 程文龙, 卜容燕, 唐杉, 韩上, 武际, 朱林, 余庆柱. 添加紫云英对稻田土壤颗粒吸附磷酸盐的影响[J]. 植物营养与肥料学报, 2022, 28(8): 1388-1397. DOI: 10.11674/zwyf.2021620
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ZHANG Wen, WANG Hui, LI Min, CHENG Wen-long, BU Rong-yan, TANG Shan, HAN Shang, WU Ji, ZHU Lin, YU Qing-zhu. Phosphate adsorption on paddy soil particles affected by application of Chinese milk vetch[J]. Journal of Plant Nutrition and Fertilizers, 2022, 28(8): 1388-1397. DOI: 10.11674/zwyf.2021620
Citation: ZHANG Wen, WANG Hui, LI Min, CHENG Wen-long, BU Rong-yan, TANG Shan, HAN Shang, WU Ji, ZHU Lin, YU Qing-zhu. Phosphate adsorption on paddy soil particles affected by application of Chinese milk vetch[J]. Journal of Plant Nutrition and Fertilizers, 2022, 28(8): 1388-1397. DOI: 10.11674/zwyf.2021620
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添加紫云英对稻田土壤颗粒吸附磷酸盐的影响

Phosphate adsorption on paddy soil particles affected by application of Chinese milk vetch

    摘要
  • 摘要:
    目的 研究添加紫云英(Chinese milk vetch, CMV)对土壤颗粒表面磷素吸附特征的影响机制，为绿肥高效利用提供理论依据。
    方法 采用土培试验方法，设置4个紫云英翻压量梯度：CMV0 (0)、CMV1 (15000 kg/hm2)、CMV2 (22500 kg/hm2)和CMV3 (30000 kg/hm2)，淹水培养30天后，取土样，过250 μm筛后，分为细砂粒(48～250 μm)、粉粒(2～48 μm)和粘粒(<2 μm)，分别测定土壤有机质、全氮、全磷和有效磷含量，并分别进行磷酸盐的等温吸附和动力学吸附试验。
    结果 与CMV0相比，添加紫云英显著提高了土壤颗粒中有机质、全氮、全磷和有效磷含量，尤以砂粒中的提高幅度最大，分别达到33.42%～81.04%、4.83%～15.17%、45.45%～51.52%和40.76%～60.70%；添加紫云英降低了砂粒和粘粒的比表面积，但是提高了粉粒的比表面积。土壤颗粒对磷素的吸附可用Langmuir吸附等温线方程很好地拟合，添加紫云英提高了各粒径土壤对磷的理论最大吸附量(Qm)、土壤本底吸磷量(NAP)、土壤磷临界浓度(EPC0)、吸附常数(KL)和土壤对磷的亲和力(Kp)。Qm值提高幅度以砂粒最大，提高了4.02%～46.81%；粉粒中NAP值、KL值、EPC0值和Kp值提高幅度最大，分别达到116.77%～210.78%、29.55%～69.05%、93.62%～141.28%和11.97%～28.87%。二级动力学方程可以很好地拟合磷酸盐在土壤颗粒表面吸附过程。拟合结果表明，添加紫云英提高了各粒径土壤颗粒对磷的初始吸附速率(H)和吸附速率常数(k2)，以粘粒的H值和k2值提高幅度最高，分别达到25.77%～98.20%和25.74%～111.15%。不同粒径的H值和k2值均以CMV2处理最高。相关分析结果表明，砂粒的Qm和EPC0与有效磷含量显著相关；粉粒的NAP、EPC0和Kp与土壤有机质、全磷呈极显著相关关系，KL与全磷呈显著性相关；粘粒的Qm与全磷和有效磷含量极显著相关，EPC0与土壤有机质、全氮、全磷、比表面积均呈极显著相关关系，Kp与土壤有机质、全氮和比表面呈极显著相关。
    结论 添加紫云英主要通过影响土壤全磷和有效磷提高土壤颗粒自身贮存磷的能力，促进各土壤颗粒对磷素的吸附，特别是砂粒和粉粒。同时，CMV2处理土壤砂粒和粘粒具有较高的磷素吸附量和吸附强度，而CMV3处理粉粒具有较高的磷素吸附量和吸附强度，因此结合土壤质地，控制紫云英还田量实现稻田磷素科学管理。

     

    Abstract:
    Objectives Studying the effect of Chinese milk vetch (CMV) on phosphate (P) adsorption on soil particles could provide a theoretical basis for efficient green manure usage.
    Methods Paddy soil was collected from Anhui Province, and CMV was added at the rate of 0, 15000, 22500 and 30000 kg/hm2, and denoted as CMV0, CMV1, CMV2, and CMV3. The mixture was incubated for 30 days under anaerobic conditions. Each soil sample was divided into sand (48–250 μm), silt (2–48 μm), and clay (<2 μm) particles for the isothermal and kinetics adsorption experiment.
    Results Compared with CMV0, CMV (P<0.05) increased the content of organic matter (SOM), total nitrogen (TN), total phosphorus (TP) and available phosphorus (AP) in all the three soil particle sizes. The highest increase of 33.42%–81.04%, 4.83%–15.17%, 45.45%–51.52%, and 40.76%–60.70% was recorded in sand particles. CMV reduced the specific surface area of sandy and clay particles but increased those of silt particles. The Langmuir model described well the P adsorption of soil particles. The maximum adsorption capacity (Qm), native adsorbed exchangeable phosphorus (NAP), zero-equilibrium P concentration values (EPC0), adsorption constant (KL), and soil affinity to phosphorus (Kp) in all soil particles increased under CMV. Sandy particles recorded the highest increase, with the Qm reaching 4.02%–46.81%. In silt particles, the NAP, KL, EPC0, and Kp increased by 116.77%–210.78%, 29.55%–69.05%, 93.62%–141.28%, and 11.97%–28.87%, respectively. The kinetic P adsorption was well fitted with the Pseudo-second-order kinetics. The fitting results showed that the adsorption rate (k2) and the initial sorption rate (H) of the different soil particles increased with CMV application. The highest H and k2 increases were recorded for clay particles, increasing by 25.77%–98.20% and 25.74%–111.15%, respectively. Notably, CMV2 recorded higher H and k2 values than CMV1 and CMV3 in all soil particles. The Qm and EPC0 were correlated with AP in sandy particles (P<0.01) . The NAP, EPC0, and Kp were correlated with SOM and TP (P<0.05) ; KL was correlated with TP in silt particles (P<0.01) . In clay particles, Qm was correlated with TP and AP (P<0.01) ; EPC0 was correlated with SOM, TN, TP, and SSA; Kp was correlate with SOM, TN, and SSA (P<0.05) .
    Conclusions The adsorption of phosphate on the soil particles was enhanced by improving TP and AP mainly with the application of CMV, especially on the sandy and silt particles. The highest values of Qm and KL in CMV2 were recorded for sandy and clay particles. In CMV3, the silt particles had the highest Qm and KL. Therefore, rational application of CMV to paddy soil combined with soil texture could help achieve scientific management of P.

     

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