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氮磷水耦合作用下土壤种子库植被恢复应用参数的优化
赵娜1, 贺梦璇2, 李洪远3, 孟伟庆2, 莫训强2
1.山西省环境科学研究院, 山西 太原 030024;2.天津师范大学 地理与环境科学学院, 天津 300387;3.南开大学 环境科学与工程学院, 天津 300350
摘要:
[目的] 探究植被恢复工程中氮、磷、水的交互作用对土壤种子库萌发的影响,可为表层土壤的合理利用以及土壤种子库植被恢复工程中相关参数的调控提供有价值的参考。[方法] 采用温室萌发法,探讨氮、磷、水分等单一因素对土壤种子库萌发及幼苗初期生长的影响;采用Box-Behnken中心组合设计(BBC)与响应面法(RSM)相结合的方法来探究这3个因素对土壤种子库萌发及幼苗初期生长的交互影响,并得到植被恢复的最优方案;采用降维法对响应面模型中3因素的耦合作用进行验证。[结果] ①当氮、磷、水分分别位于5~20 g/m2,5~15 g/m2,10~30 mm范围时,土壤种子库的萌发及幼苗初期生长情况相对较好;②响应面分析中最适模型为二次模型,在该模型中水分(C)对响应值Y的影响最大,且植被恢复的最优条件为氮13.54 g/m2,磷9.47 g/m2,水分30 mm;③在水分较低的情况下,植物对氮、磷的吸收也相对较低,氮、磷、水的交互作用不显著;而在水分较高的情况下,即使施肥较少,其对应的土壤种子库萌发效果也高于施肥水平高而水分胁迫的处理。降维分析进一步验证了水分的重要性,这与响应面分析中的结果相吻合。[结论] 尽管优化条件可能与实际中略有差异,但该研究仍有很大的参考价值,且氮、磷与水分的交互效应均表现出对土壤种子库萌发及幼苗生长的促进作用。
关键词:  土壤种子库      水分含量  响应面优化  降维法
DOI:10.13961/j.cnki.stbctb.2019.05.021
分类号:S154;Q142.3
基金项目:天津市自然科学基金青年项目“基于土壤种子库技术的长芒苋生物入侵机制及入侵潜力研究”(18JCQNJC78200);天津市生态环境治理科技重大专项“天津市域生态空间格局优化与生态功能提升技术及应用”(18ZXSZSF00200)。
Optimization of Application Parameters for Revegetation of Soil Seed Bank Under Coupling Effects of Nitrogen, Phosphorus and Water Content
Zhao Na1, He Mengxuan2, Li Hongyuan3, Meng Weiqing2, Mo Xunqiang2
1.Shanxi Research Academy of Environmental Sciences, Taiyuan, Shanxi 030024, China;2.College of Geographic and Environment Sciences, Tianjin Normal University, Tianjin 300387, China;3.College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
Abstract:
[Objective] The effects and interaction of nitrogen, phosphorus and water on the germination of a soil seed bank in vegetation restoration project were explored in order to provide valuable reference for the judicious utilization of topsoil and the control of key parameters on soil seed bank's vegetation recovery engineering.[Methods] The effect of three factors (nitrogen, phosphorus and water) on soil seed bank's germination and early seedling growth were studied using greenhouse germination experiments. Box-Behnken central composite design (BBC) combined with the response surface methodology (RSM) was used to explore the interaction effect of these three factors on the soil seed bank's germination and early seedling growth, and the optimal scheme of soil seed bank's vegetation restoration was obtained. Finally, the coupling effect of the three factors in the response surface model was verified by the dimension reduction method.[Results] ① With nitrogen, phosphorus and water content in the range of 5~20 g/m2, 5~15 g/m2, 10~30 mm respectively, the germination effect on the soil seed bank was the best in the single factor experiment; ② The quadratic model was selected in the response surface analysis, and the water had the most important influence on soil seed bank. The optimal conditions for the vegetation recovery was determined to be with levels of nitrogen of 13.54 g/m2, phosphorus of 9.47 g/m2, and water content of 30 mm respectively; ③ Plant uptake of nitrogen and phosphorus was relatively lower under low water content, in which the interaction of nitrogen, phosphorus and water content was not significant. In the case of higher water content, even if fewer fertilizers were applied, the germination effect on the corresponding soil seed bank was higher than that of the treatment with high fertilizer level but water stress. The water content was determined to be the most important factor in the research by the method of dimension reduction, which was consistent with the result of response surface analysis.[Conclusion] Optimal conditions may slightly different from the actual, but the research still has great reference value, and the interaction effect of nitrogen, phosphorus and water shows the promotion effect on soil seed bank's germination and early seedling growth.
Key words:  soil seed bank  nitrogen  phosphorus  water content  response surface optimization  dimension reduction method