Byambadorj Ser-Oddamba, Park Byung Bae, Hernandez Jonathan O, Tsedensodnom Enkhchimeg, Byambasuren Otgonsaikhan, Montagnoli Antonio, Chiatante Donato, Nyam-Osor Batkhuu
Laboratory of Forest Genetics and Ecophysiology, School of Engineering and Applied Sciences, National University of Mongolia, Ulaanbaatar 14201, Mongolia.
Department of Environment and Forest Resources, College of Agriculture and Life Science, Chungnam National University, Daejeon 34134, Korea.
Plants (Basel). 2021 Nov 8;10(11):2407. doi: 10.3390/plants10112407.
Desertification is impeding the implementation of reforestation efforts in Mongolia. Many of these efforts have been unsuccessful due to a lack of technical knowledge on water and nutrient management strategies, limited financial support, and short-lived rainfall events. We investigated the effects of irrigation and fertilization on the morphophysiological traits of Hort. Ex Tausch and L. and to suggest irrigation and fertilization strategies for reforestation. Different irrigation and fertilizer treatments were applied: no irrigation, 2 L h, 4 L h, and 8 L h of water; no fertilizer, 2 L h + NPK, 4 L h + NPK, and 8 L h + NPK; and no compost, 2 L h + compost, 4 L h + compost, and 8 L h + compost. The leaf area (LA) and specific leaf area (SLA) of both species responded positively to 4 and 8 L h. Results also showed that the addition of either NPK or compost to 4 or 8 L h irrigation resulted in a higher LA, SLA, and leaf biomass (LB). Total chlorophyll content decreased with irrigation in both species. The same pattern was detected when a higher amount of irrigation was combined with fertilizers. Lastly, we found that both diurnal and seasonal leaf water potential of plants grown in 4 or 8 L h were significantly higher than those of plants grown in control plots. Therefore, 4 or 8 L h with either NPK or compost has shown to be the optimal irrigation and fertilization strategy for the species in an arid and semiarid region of Mongolia. Results should provide us with a better understanding of tree responses to varying amounts of irrigation with or without fertilizer in pursuit of sustainable forest management in arid and semiarid ecosystems.
荒漠化正阻碍着蒙古的植树造林工作。由于缺乏水和养分管理策略方面的技术知识、资金支持有限以及降雨事件持续时间短，许多此类努力都未成功。我们研究了灌溉和施肥对Hort. Ex Tausch和L.形态生理特征的影响，并提出了植树造林的灌溉和施肥策略。采用了不同的灌溉和施肥处理：不灌溉、2升/小时、4升/小时和8升/小时的水量；不施肥、2升/小时+氮磷钾、4升/小时+氮磷钾和8升/小时+氮磷钾；不施堆肥、2升/小时+堆肥、4升/小时+堆肥和8升/小时+堆肥。两种植物的叶面积（LA）和比叶面积（SLA）对4升/小时和8升/小时的处理反应呈正向。结果还表明，在4升/小时或8升/小时的灌溉中添加氮磷钾或堆肥会导致更高的叶面积、比叶面积和叶生物量（LB）。两种植物的总叶绿素含量均随灌溉量增加而降低。当大量灌溉与肥料结合时也检测到相同的模式。最后，我们发现，在4升/小时或8升/小时条件下生长的植物的日叶水势和季节叶水势均显著高于对照地块中生长的植物。因此，4升/小时或8升/小时的灌溉量结合氮磷钾或堆肥已被证明是蒙古干旱和半干旱地区这些植物的最佳灌溉和施肥策略。研究结果应能让我们更好地了解树木在有无肥料情况下对不同灌溉量的反应，以实现干旱和半干旱生态系统的可持续森林管理。
