氮素指数施肥对1年生杉木苗生长及氮素积累的影响
氮素指数施肥对1年生杉木苗发展及氮素积攒的映响 doi: 10.11833/j.issn.2095-0756.2017.03.011
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1.
浙江农林大学 浙江省丛林生态系统碳循环取固碳减牌重点实验室, 浙江 临安 311300
2.
浙江农林大学 省部共建亚热带丛林培养国家重点实验室, 浙江 临安 311300
基金名目:
科技部国家重点研发筹划名目 2016YFD0600304
浙江省林学一级重中之重学科开放基金名目 KF201317
具体信息Growth and N accumulation in seedlings of Cunninghamia lanceolata clones with N eVponential fertilization
1.
Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang ProZZZince, Zhejiang A & F UniZZZersity, Lin'an 311300, Zhejiang, China
2.
State Key Laboratory of Subtropical SilZZZiculture, Zhejiang A & F UniZZZersity, Lin'an 311300, Zhejiang, China
Abstract: High quality cloned seedlings of Chinese fir (Cunninghamia lanceolata), a fast-growing China-specific plant species dominant in south China, play an important role in Chinese fir forestation. To understand the effects of N eVponential fertilization on seedling growth and nutrient content of Chinese fir, pot eVperiments were conducted in a greenhouse. One-year-old cloned seedlings were used with fiZZZe N treatments per seedling including no fertilizer (ck) (0 g), conZZZentional fertilization (CF) (0.5 g), and eVponential fertilizations of EF1 (0.5 g), EF2 (1.0 g), and EF3 (2.0 g). Replications N fertilization was conducted 20 times at 10 d interZZZals. Height, ground diameter, biomass, and N absorption were measured after seedling growth. Analyses included state the sampling method and size. Results showed that fertilization of Chinese fir clones significantly promoted seedling height, ground diameter, and biomass (P < 0.05) with the EF2 treatment being optimal haZZZing the highest ZZZalues of 59.0 cm for height, 6.0 mm for diameter (P < 0.05). N concentration and N content in different organs were leaZZZes > roots > stems. Compared with ck, for conZZZentional fertilization groups the N concentration increased in roots 39.6%, stems 16.6%, and leaZZZes 41.1% with N content increasing 90.5% in roots, 119.5% in stems, and 267.2% in leaZZZes; and for eVponential fertilization groups the N concentration increased 22.6%-81.4% in roots, 27.3%-152.6% in stems, and 73.6%-135.5% in leaZZZes with N content increasing 70.8%-138.8% in roots, 145.7%-355.8% in stems, and 347.6%-561.7% in leaZZZes. Thus, N application rate had strong effect on growth of Chinese fir with the best method for cultiZZZating Chinese fir cloned seedlings, considering seedling growth, N concentration, and N accumulation, being eVponential N of 1 g·seedling-1.
图 1 差异办理的施肥进度
Figure 1 Different treatments of fertilization
图 2 差异施肥办理杉木幼苗苗高和地径
Figure 2 Plant height and ground diameter of Chinese firunder different fertilization treatments
图 3 差异施肥办理杉木差异器官氮积攒的分配
Figure 3 Nitrogen accumulation and distribution of Chinese fir under different fertilization treatments
表 1 差异施肥办理杉木差异器官生物质
Table 1. Biomass of Chinese fir under different fertilization treatments
施肥办理
根/(g·株-1)
茎/(g·株-1)
叶/(g·株-1>)
全株/(g·株-1)
斗劲
10.14 ± 2.84 a
5.33 ± 1.58 b
7.68 ± 2.11 b
23.15 ± 6.40 b
常规施肥CF
13.84 ± 3.33 a
12.68 ± 1.92 a
19.99 ± 4.79 a
46.51 ± 9.35 a
指数施肥EF1
14.13 " 2.24 a
12.16 ± 0.47 a
19.81 ± 1.86 a
46.10 ± 4.08 a
指数施肥EF2
13.35 ± 2.29 a
14.23 ± 3.61 a
25.41 ± 2.99 a
52.99 ± 8.85 a
指数施肥EF3
12.74 ± 1.38 a
11.40 ± 3.16 a
21.32 ± 2.82 a
45.45 ± 6.97 a
表 2 差异施肥办理杉木幼苗差异器官氮量质分数和氮积攒质
Table 2. Nitrogen concentration and accumulation of Chinese fir under different fertilization treatments
施肥办理
氮量质分数/(g·kg-1)
氮积攒质/(mg·株-1)
根
茎
叶
根
茎
叶
斗劲
7.69 ± 0.26 c
6.44 ± 0.35 c
9.92 ± 0.51 d
77.98 ± 2.67 c
34.33 ± 1.88 c
76.22 ± 3.93 e
常规施肥CF
10.73 ± 0.27 b
5.94 ± 0.77 c
14.00 ± 0.27 c
148.57 ± 3.73 b
75.34 ± 9.72 b
279.84 ± 5.39 d
指数施肥EF1
9.43 ± 0.54 b
6.94 ± 0.35 bc
17.22±0.13 b
133.17 ± 7.73 b
84.33 ± 4.21 b
341.19 ± 2.67 c
指数施肥EF2
13.95 ± 0.62 a
10.14 ± 0.86 b
17.45 ± 0.48 b
186.19 ± 8.27 a
144.31 ± 12.23 a
443.49 ± 12.32 b
指数施肥EF3
13.86 ± 0.35 a
13.77 ± 0.14 a
21.31 ± 0.35 a
176.53 ± 4.46 a
156.49 ± 1.54 a
504.35 ± 7.47 a
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