Mao Lanhua, Zha Ruibo, Chen Shifa, Zhang Jing, Jie Ling, Zha Xuan
School of Geographical Sciences, Fujian Normal University, Fuzhou, China.
Key Laboratory for Subtropical Mountain Ecology (Ministry of Science and Technology and Fujian Province Funded), Fujian Normal University, Fuzhou, China.
Front Plant Sci. 2021 Dec 7;12:763175. doi: 10.3389/fpls.2021.763175. eCollection 2021.
is the pioneer tree species in the red soil regions of southern China, however, the serious understory soil erosion and nutrient deficiency in that region are the main factors restricting the growth of This field study examined the effects of compound fertilizer and super absorbent polymer (SAP) on the physiology, growth characteristics, biomass, soil nutrient, plant nutrient content, and nutrient uptake efficiency of 1-year-old seedlings for 2 years at Changting, Fujian in South China. One control (no fertilizer, CK) and fertilization treatments were established, namely, single compound fertilizer application (0.94, 1.89, and 3.56 g⋅plant) and mixture compound fertilizer and SAP application (0.94 + 1.01, 1.89 + 1.01, and 3.56 + 1.01 g⋅plant). Fertilization significantly improved the physiological performance, root collar diameter growth, height growth, biomass, and nutrient uptake of the seedlings. Compared with other fertilization treatments, the mixture compound fertilizer and SAP application significantly improved the seedling photosynthesis, which meant that the SAP had a significant effect on promoting photosynthesis. Under the mixture compound fertilizer and SAP application, the whole biomass of the seedlings was higher than that of all other treatments. Fertilization significantly increased the nitrogen (N), phosphorus (P), and potassium (K) content in the soils, leaves, stems, and roots of the seedlings, respectively. The P content was the main factor affecting growth characteristics and contributed to 58.03% of the total variation in seedling growth characteristics ( < 0.01). The N:P ratio of CK in the soils, leaves, and stems were higher than that of all the fertilization treatments, indicating that the severely eroded and degraded region had little P and required much of P. The principal component analysis indicated that the F2S (1.89 + 1.01 g) was the optimum fertilization amount and method in this experiment. These results provide a theoretical basis for the fertilization management of forests with severely eroded and degraded red soil regions.
是中国南方红壤地区的先锋树种，然而，该地区严重的林下土壤侵蚀和养分缺乏是限制其生长的主要因素。本田间研究在福建长汀对1年生幼苗进行了为期2年的试验，考察了复合肥和高吸水性聚合物（SAP）对其生理、生长特性、生物量、土壤养分、植物养分含量及养分吸收效率的影响。设置了一个对照（不施肥，CK）和施肥处理，即单施复合肥（0.94、1.89和3.56 g·株）以及复合肥与SAP混合施用（0.94 + 1.01、1.89 + 1.01和3.56 + 1.01 g·株）。施肥显著改善了幼苗的生理性能、根茎直径生长、高度生长、生物量和养分吸收。与其他施肥处理相比，复合肥与SAP混合施用显著提高了幼苗的光合作用，这意味着SAP对促进光合作用有显著作用。在复合肥与SAP混合施用处理下，幼苗的总生物量高于所有其他处理。施肥显著提高了幼苗土壤、叶片、茎和根中的氮（N）、磷（P）和钾（K）含量。磷含量是影响生长特性的主要因素，占幼苗生长特性总变异的58.03%（P < 0.01）。土壤、叶片和茎中CK的N:P比值高于所有施肥处理，表明严重侵蚀和退化地区磷含量低且对磷需求大。主成分分析表明，F2S（1.89 + 1.01 g）是本试验中的最佳施肥量和施肥方法。这些结果为严重侵蚀和退化的红壤地区森林的施肥管理提供了理论依据。
