北京林业大学学报2018，Vol.40Issue(2)：58-67,10.DOI:10.13332/j.1000-1522.20170251
水肥耦合对楸树苗木生长和养分状况的影响
Coupling effects of water and fertilizer on seedling growth and nutrient status of Catalpa bungei
摘要
Abstract
[Objective] Water and fertilizer are two key factors to promote plant growth, thus, it is important to study their coupling effects on growth and nutrient status of Catalpa bungei seedlings. [Method]The pot experiment with Catalpa bungei seedlings in three different water levels (30% ,50%and 70% saturated water content(FWC)) with four fertilization levels of T1(N 0 g,P 0 g,K 0 g), T2(N 2 g,P 1 g,K 1. 5 g), T3(N 4 g,P 2 g,K 3 g), T4(N 6 g,P 3 g,K 4. 5 g) was conducted to study the coupling effects of water and fertilizer on growth, nutrient absorption and fertilizer utilization. [Result] The interactive effects of water and fertilizer coupling on morphological indexes of Catalpa bungei seedlings were not significant. Root collar diameter, height, and biomass of seedlings decreased with rising water level, reaching the top at 30% saturated water content, but firstly increased and then decreased with increasing fertilization level, reaching peak at T3 fertilization level. The nutrient content of seedlings reached a luxury nutrient state at T3 treatment, meanwhile seedling height, root collar diameter, biomass and nutrient content of seedlings were the highest. If more fertilizers were applied on seedlings, it would occur toxic effects. Since at T3 treatment, although the nutrient concentration of seedlings was increasing, the morphological indexes and nutrient content decreased. There were interactions of water and fertilizer coupling effects on nutrient concentration and nutrient content of Catalpa bungei seedlings. Nutrient content rose with increasing fertilizers, and reached the peak under T3 treatment. When water content was 30% FWC, fertilization had a greater promotion for seedlings of Catalpa bungei. [Conclusion] It proves that water and fertilizer coupling effects promote the quality of seedlings. Furthermore, 30% FWC and T3 treatment was the best combination for cultivating seedlings of Catalpa bungei.关键词
楸树/水肥耦合/苗木生长/养分积累/养分质量分数Key words
Catalpa bungei/water and fertilizer coupling/seedling growth/nutrient accumulation/nutrient mass concentration分类
农业科技引用本文复制引用
烟亚萍,刘勇,贺国鑫,薛敦孟,李成..水肥耦合对楸树苗木生长和养分状况的影响[J].北京林业大学学报,2018,40(2):58-67,10.基金项目
北京园林绿化落叶乔木优良品种选育及栽培技术(CEG-2015-01-01),2016 年北京园林绿化增彩延绿植物资源收集、快繁与应用技术研究(CEG-2016-01). （CEG-2015-01-01）
