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缓释肥N/P比及加载量对5种珍贵树种1年生苗生长和养分库构建的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2020年01期
Page:
72-80
Column:
研究论文
publishdate:
2020-01-15

Article Info:/Info

Title:
Effects of N/P ratio and loading on growth and construction of nutrients reserves of one-year-old seedlings for five kinds of precious tree species
Article ID:
1000-2006(2020)01-0072-09
Author(s):
LI Fengqing13WANG Xiuhua2CHU Xiuli1* ZHANG Dongbei2 WU Xiaolin1ZHOU Shengcai2YE Ming4
(1.Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Key Laboratory of Tree Breeding of Zhejiang Province, Hangzhou 311400, China; 2. Experimental Forest Farm of Qingyuan Country, Zhejiang Province, Qingyuan 323800, China; 3.Experimental Center of Subtropical Forestry, Chinese Academy of Forestry, Fenyi 336600,China; 4. Forest Farm of Shouchang in Jiande City, Zhejiang Province, Jiande 311612, China)
Keywords:
Phoebe chekiangensis Cinnamomum chekiangense Taxus wallichiana var. mairei Cyclobalanopsis gilva Schima superba container seedling N/P ratio slow-release fertilizer loading nutrient pool
Classification number :
S722
DOI:
10.3969/j.issn.1000-2006.201902007
Document Code:
A
Abstract:
【Objective】 To provide scientific guidance for seedling cultivation in containers, the impacts of slow-release fertilizer(SRF)loading were observed for the growth, nitrogen(N)and phosphorus(P)uptake, and nutrient pool construction of five precious tree species, such as Phoebe chekiangensis. 【Method】 A 4 × 4 factorial experimental design was used to compare the impacts of the N/P mass ratio(1.75:1, 2.25:1, 2.75:1 and 3.25:1)and SRF loading levels(1.5, 2.5, 3.5 and 4.5 kg/m3)on the growth and N and P nutrient pool construction of one-year-old seedlings. 【Result】 Significant effects were detected in the growth and dry matter accumulation between N/P ratios, SRF loading, and their interaction. As the N/P ratio increased, the tree species responded differently. The largest growth and dry matter accumulation of the five precious tree species was detected with 3.5 kg/m3 SRF loading. The N concentration in the leaves of P. chekiangensis, Cinnamomum chekiangense and Schima superba was correlated with the N/P ratio, but there was no difference in the leaf N concentration of Taxus wallichiana and Cyclobalan gilvain. The P concentration in the leaves of all species, except for P. chekiangensis, also significantly differed with varying N/P ratios. However, the N and P accumulation in the leaves of all species were not sensitive to the N/P ratio. The effect of the SRF loading on the nutrient accumulations was more obvious than the N/P ratios; the concentration and accumulation of leaf N and P were highest with 3.5 kg/m3 SRF loading. Changes in the N and P concentrations in the organs of the different species were similar, indicating N/P absorption synchrony, whilst the distribution of N and P among the organs was species-specific. 【Conclusion】 Based on the growth characteristics of the different tree species, seedlings of P. chekiangensis should be loaded with higher N content fertilizer, and the seedlings of Cinnamomum chekiangense, Cyclobalan gilva and S. superba should be loaded with higher P content fertilizer. T. wallichiana seedlings are not sensitive to the N/P ratio, but nutrition construction suggests that it is N/P ratio and adding appropriate amounts of SRF(3.5 kg/m3

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Last Update: 2020-01-15