Effects of Final Singling Time on Growth of One-year-old Seedlings of Cunninghamia konishii

doi:10.11924/j.issn.1000-6850.casb20200100014

Abstract

Abstract:

Aiming to explore the influence of final singling time on growth dynamics and growth rhythm of Cunninghamia konishii seedlings, optimize final singling seedling time, and provide theoretical and technical support for seedling cultivation, the experiment of final singling time of C. konishii was carried out with annual seedlings. The effects of final singling time on seedling growth dynamics and growth rhythm were analyzed by using the method of fixed plant observation and fitting seedling growth dynamics with Logistic equation. The results showed that the effect of final singling time on seedlings height and ground diameter growth appeared with the time, and it was a dynamic process. Logistic equation fitted well the growth dynamics of C. konishii seedlings. Final singling time significantly affected the total linear growth, the linear growth rate and the maximum linear growth rate of seedling height and ground diameter, but had no significant effect on the linear growth beginning days, linear growth final days, and linear growth duration of seedling height and ground diameter. Final singling time at initial stage of seedling height growth significantly increased the total linear growth, the linear growth rate and the maximum linear growth rate of seedling height and ground diameter compared with other treatments, and increasing the nutrient and water supply in fast-growing stage could improve the seedlings quality. The reasonable final singling time of C. konishii is at the initial stage of seedling height growth (June 30).

Key words: Cunninghamia konishii, final singling time, seedling height, ground diameter, growth, growth rhythm, Logistic model

CLC Number:

S723.1

Ou Jiande, Kang Yongwu. Effects of Final Singling Time on Growth of One-year-old Seedlings of Cunninghamia konishii[J]. Chinese Agricultural Science Bulletin, 2020, 36(34): 20-24.

Figures/Tables 5

References 28

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指标	定苗时间	生长极限k	待定系数a	待定系数b	决定系数R²
苗高	苗高生长初期	31.124	5.346	0.029	0.994
	地径生长初期	31.021	5.609	0.030	0.996
	速生期	26.147	5.800	0.030	0.996
地径	苗高生长初期	7.514	16.04	0.032	0.950
	地径生长初期	7.021	14.912	0.031	0.968
	速生期	6.489	18.552	0.032	0.980

指标	定苗时间	生长极限k	待定系数a	待定系数b	决定系数R²
苗高	苗高生长初期	31.124	5.346	0.029	0.994
	地径生长初期	31.021	5.609	0.030	0.996
	速生期	26.147	5.800	0.030	0.996
地径	苗高生长初期	7.514	16.04	0.032	0.950
	地径生长初期	7.021	14.912	0.031	0.968
	速生期	6.489	18.552	0.032	0.980

指标	定苗时间	F值	M_E	M_AE	M_PE/%	M_APE/%
苗高	苗高生长初期	1549.939^**	0.164	0.508	0.531	5.422
	地径生长初期	1191.216^**	0.044	0.471	0.107	4.066
	速生期	2436.012^**	-0.233	0.449	-1.365	3.116
地径	苗高生长初期	305.905^**	0.008	0.269	3.460	11.007
	地径生长初期	519.244^**	0.029	0.211	3.556	9.500
	速生期	933.527^**	0.087	0.123	5.982	7.960

指标	定苗时间	F值	M_E	M_AE	M_PE/%	M_APE/%
苗高	苗高生长初期	1549.939^**	0.164	0.508	0.531	5.422
	地径生长初期	1191.216^**	0.044	0.471	0.107	4.066
	速生期	2436.012^**	-0.233	0.449	-1.365	3.116
地径	苗高生长初期	305.905^**	0.008	0.269	3.460	11.007
	地径生长初期	519.244^**	0.029	0.211	3.556	9.500
	速生期	933.527^**	0.087	0.123	5.982	7.960

指标	定苗时间	物候期参数		生长参数
指标	定苗时间	t₁/d	t₂/d	LGD/d	MGR	LGR	TLG
苗高	苗高生长初期	12.39a	103.22a	90.83a	0.23a	0.20a	8.41a
	地径生长初期	13.58a	101.38a	87.80a	0.23a	0.21a	8.22a
	速生期	14.70a	102.49a	87.80a	0.20b	0.17b	6.20b
地径	苗高生长初期	45.57a	127.88a	82.31a	0.060a	0.053a	4.338a
	地径生长初期	44.68a	129.65a	84.97a	0.054b	0.048b	4.054b
	速生期	50.11a	132.42a	82.31a	0.052b	0.046b	3.746c