Responses of needle functional traits of Pinus elliottii to phosphorus addition

doi:10.12302/j.issn.1000-2006.202101021

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (6): 65-71.doi: 10.12302/j.issn.1000-2006.202101021

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Responses of needle functional traits of Pinus elliottii to phosphorus addition

JIA Ting(), SONG Wuyun, GUAN Xinxian, WEI Zhiwen, CHEN Han, YI Min, XIONG Qihui, ZHANG Lu^*()

Jiangxi Provincial Key Laboratory of Silviculture, 2011 Collaboration Innovation Center of Jiangxi Typical Trees Cultivation and Utilization, Jiangxi Agricultural University, Nanchang 330045, China

Received:2021-01-18 Accepted:2021-06-20 Online:2021-11-30 Published:2021-12-02
Contact: ZHANG Lu E-mail:15180182806@163.com;zhlu856@163.com

Abstract

Abstract:

【Objective】 The aim of this study is to reveal the correlation between functional traits of needles in middle-aged Pinus elliottii plantations and to explore the response mechanism of functional traits of needles to the phosphorus addition and the adaptation strategy to environmental nutrients. 【Method】 In this study, a 12-year-old P. elliottii plantation was selected as the research object. Three phosphorus gradients (P1 as 25 kg/hm ², P2 as 50 kg/hm², P3 as 100 kg/hm²) and no phosphorus application (CK) were used as controls. The changes in nine morphological indexes, such as leaf length, leaf area and specific leaf area, and the contents of total nitrogen, total phosphorus, and organic matter in needles were analyzed. 【Result】 ① The coefficient of variation of functional traits of P. elliottii needles under all treatments ranged from 6.62% to 19.77%, among which the coefficient of variation of sheath length and specific leaf area was larger than 19%, and the coefficient of variation of organic carbon was the least (6.61%). ② Compared with CK, the increase in P concentration, except in the dry matter content of needles, decreased significantly (P < 0.05), while other morphological indices such as leaf area, specific leaf area and nutrient content of needles increased. ③ There was a close correlation between morphological indices and the nutrient content of P. elliottii needles. The leaf area and specific leaf area of P. elliottii needles were positively correlated with the contents of total K and total P (P < 0.05), and the correlation coefficient was above 0.597. The dry matter content of P. elliottii needles was negatively correlated with the contents of total P, total K and organic matter (P < 0.05), with correlation coefficients of -0.840, -0.639, and -0.530, respectively. 【Conclusion】 ① The functional traits of P. elliottii needles were weakly variable, and the functional traits of P. elliottii needles had strong internal stability in specific environments. ② Phosphorus supplementation could improve the morphogenesis and nutrient storage of P. elliottii needles, and the effect of high concentration (P3) phosphorus supplementation was the most obvious. ③ The morphogenesis of P. elliottii needles is related to their nutrient content. High nutrient content promotes the growth and metabolism of needles, increases the area of needles, and speeds up the transport of dry matter to other organs, which reduces the dry matter content of needles.

Key words: Pinus elliottii, phosphorus addition, needle leave, functional characters, morphogenesis of needles, nutrient

CLC Number:

S714.2

JIA Ting, SONG Wuyun, GUAN Xinxian, WEI Zhiwen, CHEN Han, YI Min, XIONG Qihui, ZHANG Lu. Responses of needle functional traits of Pinus elliottii to phosphorus addition[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(6): 65-71.

Figures/Tables 4

Table 1

Table 2

Fig.1

Table 3

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指标 index	土壤养分含量 nutrient content						pH
指标 index	全氮/ (g·kg^-1) total nitrogen	全磷/ (g·kg^-1) total phosphorus	全钾/(g·kg^-1) total potassium	有机质/ (g·kg^-1) organic matter	有效磷/ (mg·kg^-1) available phosphorus	速效钾/ (mg·kg^-1) available potassium	pH
值 value	1.06	0.50	2.45	10.19	0.52	23.73	4.73

针叶功能性状 leaf functional traits	CK			P1				P2				P3				组间变异系数/%CV
针叶功能性状 leaf functional traits	F	P		F		P		F		P		F		P		组间变异系数/%CV
叶长LL	0.922		0.507		0.384		0.771		0.740		0.581		3.554		0.126	7.33
叶宽DL	4.794		0.082		0.730		0.586		3.186		0.146		0.472		0.718	6.62
叶厚TL	0.184		0.902		0.385		0.770		0.558		0.670		3.285		0.140	12.19
单面弧面面积SCS	3.977		0.108		0.623		0.637		3.169		0.147		0.639		0.628	12.83
叶面积LA	3.980		0.108		0.629		0.633		3.204		0.145		0.644		0.626	12.75
叶鞘长FSL	0.110		0.950		0.612		0.642		1.583		0.326		0.252		0.857	19.77
束粗FW	1.015		0.474		0.179		0.906		0.501		0.702		1.524		0.338	14.35
叶干物质含量LDM	0.431		0.742		2.889		0.166		3.030		0.156		6.844		0.047	17.66
比叶面积SLA	5.203		0.072		0.830		0.543		0.585		0.656		1.159		0.429	19.25
相对含水率RMC	3.257		0.142		0.156		0.920		1.517		0.339		9.000		0.030	8.90
全氮含量TN content	2.446		0.204		17.344		0.009		3.359		0.136		5.322		0.070	18.39
全磷含量TP content	2.408		0.208		13.817		0.014		4.345		0.095		2.582		0.191	11.38
全钾含量TK content	0.913		0.510		1.083		0.452		0.356		0.789		4.756		0.083	13.78
有机碳含量TOC content	0.884		0.521		0.773		0.567		1.124		0.439		0.605		0.646	6.61

性状 trait	形态指标function characters									养分含量nutrient content
性状 trait	LL	DL	TL	LA	FSL	FW	LDM	SLA	RMC	TN	TP	TK	TOC
LL	1	0.683^**	0.220	0.921^**	-0.013	0.196	-0.894^**	0.841^**	0.496^**	0.291	0.860^**	0.615^**	0.427^*
DL		1	0.266	0.912^**	-0.180	0.373^*	-0.702^**	0.833^**	0.428^*	0.005	0.613^**	0.471^**	0.426^*
TL			1	0.259	-0.398^*	0.512^**	-0.128	0.207	-0.006	-0.129	0.324	0.163	0.260
LA				1	-0.101	0.311	-0.873^**	0.914^**	0.511^**	0.175	0.860^**	0.597^**	0.471^**
FSL					1	-0.481^**	0.054	-0.085	0.105	0.612^**	-0.007	-0.242	-0.457^**
FW						1	-0.248	0.183	0.034	-0.067	0.209	0.074	0.387^*
LDM							1	-0.829^**	-0.538^**	-0.246	-0.840^**	-0.639^**	-0.530^**
SLA								1	0.608^**	0.119	0.778^**	0.633^**	0.428^*
RMC									1	0.222	0.497^**	0.439^*	0.265
TN含量										1	0.420^*	0.197	-0.142
TP含量											1	0.647^**	0.522^**
TK含量												1	0.399^*
TOC含量													1

Responses of needle functional traits of Pinus elliottii to phosphorus addition

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