Synergistic effects of nitrogen and plant growth-promoting rhizobacteria inoculation on the growth, physiological traits and nutrient absorption of intercropped Eucalyptus urophylla × Eucalyptus grandis and Dalbergia odorifera
Yahui Lan, Liangning Liao, Xianyu Yao, Shaoming Ye
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引用次数: 2
Key message
Legume/nonlegume intercropping systems equipped with moderate nitrogen (N) application and PGPR inoculation could be exploited in eucalyptus growing areas and degraded land as an ecologically sustainable system to avoid excessive fertilization and enhance nitrogen use efficiency.
Abstract
Hazardous nitrogenous fertilizers in eucalyptus monocultures are challenging for the balance between eucalyptus wood production and ecological service functions. To assess whether plant growth-promoting rhizobacteria (PGPR) inoculation coupled with N application may improve plant growth by increasing biomass, photosynthesis, soil nutrient supply, and nutrient uptake capacity in the intercropping system. A pot experiment was performed to evaluate the synergistic effects of N application and N-fixing PGPR on growth, physiological parameters, N accumulation and nitrogen use efficiency (NUE) in intercropped Eucalyptus urophylla × Eucalyptus grandis (E. urophylla × E. grandis) and Dalbergia odorifera (D. odorifera). N fertilization positively influenced the plant height, dry matter yield, photosynthetic characteristics, N accumulation and nitrate reductase activity of E. urophylla × E. grandis under both inoculations. The growth and physiological traits of D. odorifera improved under the N2 (6 g N pot−1) application level. E. urophylla × E. grandis inoculated with Rhizobium japonicum IOC 113-2 showed higher values for plant height, biomass accumulation, N accumulation and photosynthesis with N fertilization, but the growth and physiological parameters of D. odorifera responded differentially to different inoculation treatments. The results demonstrated that an appropriate N supply in combination with N-fixing PGPR inoculation of legumes could increase nutrient absorption, NUE and yield advantages in intercropped E. urophylla × E. grandis and D. odorifera; thus, this method could be recommended as an alternative planting system under N-limited conditions in agroecosystems.
关键信息在桉树种植区和退化土地上，采用适度施氮和接种 PGPR 的豆科/非豆科间作系统可作为一种生态可持续系统加以利用，以避免过度施肥并提高氮的利用效率。为了评估接种植物生长促进根瘤菌（PGPR）并施用氮肥是否能通过增加间作系统中的生物量、光合作用、土壤养分供应和养分吸收能力来改善植物生长。研究人员通过盆栽试验评估了施氮和固氮 PGPR 对间作桉树 × 大叶桉（E. urophylla × E. grandis）和臭椿（D. odorifera）的生长、生理参数、氮积累和氮利用效率（NUE）的协同效应。在两种接种条件下，氮肥对 E. urophylla × E. grandis 的株高、干物质产量、光合特性、氮积累和硝酸还原酶活性均有积极影响。在施用 N2（6 g N pot-1）的条件下，D. odorifera 的生长和生理特性均有所改善。接种日本根瘤菌 IOC 113-2 的 E. urophylla × E. grandis 的株高、生物量积累、氮积累和光合作用在施用氮肥时均表现出较高值，但 D. odorifera 的生长和生理参数对不同接种处理的反应不同。结果表明，适当的氮供应与豆科植物的固氮 PGPR 接种相结合，可增加 E. urophylla × E. grandis 和 D. odorifera 间作的养分吸收、氮利用效率和产量优势；因此，在农业生态系统氮有限的条件下，这种方法可被推荐为替代种植系统。
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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