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草业学报 ›› 2026, Vol. 35 ›› Issue (10): 167-179.DOI: 10.11686/cyxb2025427

• 研究论文 • 上一篇    

象草氮磷钾化学计量特征及主要饲用品质对沼液添加的响应

黄小云1(), 梁政翔1, 吴志锋2, 周柳婷1, 陈长福3, 林嘉丽1, 罗涛1, 黄秀声1()   

  1. 1.福建省农业科学院资源环境与土壤肥料研究所,福建省丘陵地区循环农业工程技术研究中心,福建 福州 350013
    2.龙岩市土壤肥料技术站,福建 龙岩 364000
    3.龙岩市动物疫病预防控制中心,福建 龙岩 364000
  • 收稿日期:2025-10-18 修回日期:2025-11-20 出版日期:2026-10-20 发布日期:2026-09-09
  • 通讯作者: 黄秀声
  • 作者简介:E-mail; hxs706@163.com
    黄小云(1989-),女,福建泉州人,助理研究员,硕士。E-mail: 954945394@qq.com
  • 基金资助:
    福建省科技计划项目(2022R1021002);福建省科技计划项目(2024R1024001);福建省科技计划项目(2025R1067);福建省科技计划项目(2025R1023002);福建省科技计划项目(2026R1070);福建省人民政府-中国农业科学院“5511”协同创新工程(XTCXGC2021010);福建省人民政府-中国农业科学院“5511”协同创新工程(XTCXJSGG202603);龙岩市科技计划项目(2020LYF9020)

Effects of biogas slurry addition on nitrogen, phosphorus, and potassium stoichiometry and feed quality of Pennisetum purpureum

Xiao-yun HUANG1(), Zheng-xiang LIANG1, Zhi-feng WU2, Liu-ting ZHOU1, Chang-fu CHEN3, Jia-li LIN1, Tao LUO1, Xiu-sheng HUANG1()   

  1. 1.Fujian Engineering and Technology Research Center for Recycling Agriculture in Hilly Areas,Institute of Resources,Environment and Soil Fertilizer,Fujian Academy of Agricultural Sciences,Fuzhou 350013,China
    2.Longyan Soil and Fertilizer Station,Longyan 364000,China
    3.Center for Animal Disease Control and Prevention,Longyan City,Longyan 364000,China
  • Received:2025-10-18 Revised:2025-11-20 Online:2026-10-20 Published:2026-09-09
  • Contact: Xiu-sheng HUANG

摘要:

为研究象草养分及饲用品质对沼液添加的响应机制,以‘桂闽引’象草为研究对象开展田间小区试验,设5个沼液氮添加水平(0、50、100、150和200 kg N·hm-2·次-1),依次记为CK、N50、N100、N150和N200,在45 d的刈割周期内施用3次。象草刈割两茬,测定植株茎、叶的氮(N)、磷(P)、钾(K)、粗蛋白(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)含量,分析沼液添加对象草CP和相对饲喂价值(RFV)与N、P、K含量及其化学计量特征的影响。结果表明:沼液添加显著提高了象草茎秆的CP和N含量(P<0.05),且不同茬次、不同器官的响应有显著差异(P<0.001)。N50处理可显著降低第2茬叶片的ADF含量(P<0.05),且不同器官间有显著差异(P<0.001)。第2茬叶片RFV在N100处理下最高,显著高于N200(P<0.05)。对于CP和RFV,两者显著正相关,其在茎秆中与N、K、N/P和K/P显著正相关,在叶片中与N、P显著正相关,在茎、叶中与NDF和ADF显著负相关(P<0.05)。逐步回归分析和结构方程模型表明,茎、叶的N含量可显著正向影响CP含量(P<0.001),其总效应值分别为0.92和0.32。茎秆P含量、叶片K/P和P含量共同影响RFV,其总效应值分别为-0.86、0.59和0.57。综上,沼液施用主要通过影响象草茎、叶的N、P含量和叶片的K/P,从而直接或间接调控其主要饲用品质。

关键词: 象草, 沼液, 氮磷钾, 化学计量比, 饲用品质

Abstract:

In this study, we investigated the effects of adding biogas slurry on the nutrient and feed quality of Pennisetum purpureum. Biogas slurry was applied to P. purpureum at five different rates (0, 50, 100, 150 and 200 kg N·ha-1 per application, denoted as CK, N50, N100, N150 and N200, respectively) three times during a 45-day cutting cycle. The contents of nitrogen (N), phosphorus (P), potassium (K), crude protein (CP), neutral detergent fiber (NDF), and acid detergent fiber (ADF) in stems and leaves were measured, and the effects of biogas slurry addition on CP, relative feeding value (RFV), and the N, P and K stoichiometry of P. purpureum were analyzed. The results show that the addition of biogas slurry significantly increased the CP and N contents of P. purpureum stems (P<0.05), and there were significant differences in responses among different cutting periods and different organs (P<0.001). The N50 treatment led to a significant reduction in the ADF content in the leaves at the second cutting (P<0.05) and significant differences in ADF contents among different organs (P<0.001). At the second cutting, the RFV of leaves was highest in the N100 treatment, and was significantly higher than that in the N200 treatment (P<0.05). There was a significant positive correlation between CP and RFV. Both CP and RFV were significantly positively correlated with N, K, N∶P and K∶P in stems and N and P in leaves, and negatively correlated with NDF and ADF in both organs (P<0.05). A stepwise regression analysis and structural equation model showed that the N contents of stems and leaves significantly and positively affected the CP content of P. purpureum (P<0.001), with total effect values of 0.92 and 0.32, respectively. The stem P content and leaf K∶P and P content jointly affected RFV, with total effect values of -0.86, 0.59, and 0.57, respectively. In conclusion, application of biogas slurry affected the N and P contents of stems and leaves and the K∶P of leaves, thereby directly or indirectly regulating the feed quality of P. purpureum.

Key words: Pennisetum purpureum, biogas slurry, nitrogen, phosphorus and potassium, stoichiometric ratio, feed quality