Stoichiometric characteristics of C, N, P of Taxus chinensis var. mairei plantation needles

doi:10.12302/j.issn.1000-2006.202103051

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5): 53-61.doi: 10.12302/j.issn.1000-2006.202103051

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Stoichiometric characteristics of C, N, P of Taxus chinensis var. mairei plantation needles

CHEN Li¹(), LIU Chenggong², QIAN Yingying¹, TANG Xiaodie¹, WANG Shengshu¹, LI Zhidong¹, LI Yan¹, CUI Jun¹

1. College of Life and Environmental Sciences, Huangshan University, Huangshan 245041, China
2. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China

Received:2021-03-30 Accepted:2021-06-11 Online:2021-09-30 Published:2021-09-30

Abstract

Abstract:

【Objective】 The nutrient ecological stoichiometry and nutrient reabsorption characteristics of Taxus chinensis var. mairei needles were studied to reveal its nutrient restriction pattern and nutrient efficient utilization strategy, thereby providing a theoretical basis for its high-quality afforestation and plantation cultivation 【Method】 The nutrient contents, ecological stoichiometric ratio, nutrient reabsorption efficiency and their relationships were analyzed by measuring the contents of carbon (C), nitrogen (N), and phosphorus (P) and their stoichiometric characteristics in needles of 9-year-old T. chinensis var. mairei plantations at different growth stages. 【Result】 The results showed that the average C, N and P contents of T. chinensis var. mairei plantation needles were 479.67, 22.52 and 2.21 g/kg, respectively. The C/N mass ratio (C:N), C/P mass ratio (C:P), and N/P mass ratio (N:P) were 21.74, 226.25 and 10.55, respectively. A significantly positive correlation between N, P and C existed. Similarly, P content was significantly positively correlated with C content. The C content, which was stable in the needles, had a lower coefficient of variation (3.09%), and P (22.43%) content had higher variability than that of N (15.34%). During the growing season (from June to November), the contents of C and P first rose slightly, and decreased dramatically,both peaked in August and kept until September. The C and N contents reached the lowest in October and November, respectively. The P content increased obviously first, then declined greatly,and peaked in September,much higher than those in other months. Changes in C:N and N:P were stabler than those in C:P that relied on P content. The nitrogen reabsorption efficiency (NRE) and phosphorus reabsorption efficiency (PRE) were 19.33% and 22.16%, respectively. The PRE was negatively correlated with P content and C:P in the senescent needles, but positively correlated with N:P. 【Conclusion】 In the study area, needles of 9-year-old T. chinensis var. mairei plantations had a good C storage capacity and nutrient resource competitiveness, and the nutrients were retained long time in needles because of the low efficiency of N and P reabsorption. Therefore, growth and development of T. chinensis var. mairei plantations was not hindered by N and P.

Key words: Taxus chinensis var. mairei plantation, needle nutrient elements, stoichiometry characteristics, nutrient reabsorption efficiency

CLC Number:

S792.99

CHEN Li, LIU Chenggong, QIAN Yingying, TANG Xiaodie, WANG Shengshu, LI Zhidong, LI Yan, CUI Jun. Stoichiometric characteristics of C, N, P of Taxus chinensis var. mairei plantation needles[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(5): 53-61.

Figures/Tables 5

Table 1

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统计值 statistics	元素含量/(g·kg^-1) element content			比值ratio
统计值 statistics	C	N	P	C∶N	C∶P	N∶P
均值 mean	479.67± 18.73	22.52± 3.45	2.21± 0.50	21.74± 3.00	226.25± 46.58	10.55± 2.34
极大值 max.	509.90	32.90	4.01	28.22	312.53	16.16
极小值 min.	418.20	15.50	1.54	14.35	125.88	5.60
全距 range	91.70	17.40	2.47	13.87	186.65	10.56
变异系数/% CV	3.90	15.34	22.43	13.80	20.59	22.13

统计量 statistics	c(C)	c(N)	c(P)	C∶N	C∶P	N∶P
c(C)	1.000
c(N)	0.392^**	1.000
c(P)	0.299^*	0.438^**	1.000
C∶N	-0.229	-0.970^**	-0.390^**	1.000
C∶P	-0.141	-0.387^**	-0.933^**	0.377^*	1.000
N∶P	-0.051	0.137	-0.787^**	-0.170	0.841^**	1.000

y	x		成熟叶mature leaves						衰老叶senescent leaves
y	x		方程equation		R²		P		方程equation		R²	P
N重吸收率 NRE	c(C)	y=0.181 x-69.393		0.014		0.371		y =-0.025 x+42.312		0.009		0.132
	c(N)	y=0.845 x-1.282		0.116		0.168		y =-1.172 x+42.312		0.153		0.399
	c(P)	y= 7.966 x-1.282		0.136		0.145		y=8.209 x+3.269		0.134		0.151
	C∶N	y =-0.930 x+38.217		0.107		0.179		y=1.188 x+3.269		0.163		0.124
	C∶P	y =-0.104 x+40.529		0.129		0.154		y =-0.061 x+34.325		0.122		0.161
	N∶P	y =-0.352 x+22.874		0.002		0.448		y =-1.339 x+33.118		0.194		0.101
P重吸收率 PRE	c(C)	y =-0.217 x+128.500		0.010		0.061		y=0.044 x+1.353		0.018		0.107
	c(N)	y=1.933 x-25.767		0.307		0.398		y=1.624 x-11.053		0.210		0.365
	c(P)	y=6.149 x+6.974		0.046		0.292		y =-17.824 x+56.336		0.345		0.047
	C∶N	y =-2.272 x+67.454		0.309		0.060		y =-1.943 x+68.081		0.293		0.066
	C∶P	y =-0.097 x+41.670		0.061		0.260		y =-1.909 x+67.265		0.283		0.026
	N∶P	y=3.267 x-10.820		0.117		0.183		y=3.106 x-11.709		0.534		0.013

Stoichiometric characteristics of C, N, P of Taxus chinensis var. mairei plantation needles

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