新疆野苹果枝条化学计量海拔变异特征研究

doi:10.13866/j.azr.2021.02.16

Abstract

Abstract:

The variability of nutrient stoichiometric characteristics of wild apple trees (Malus sieversii) at different altitudes was investigated. Investigation and sampling were conducted at four altitude gradients of 1300 m, 1400 m, 1500 m, and 1600 m in a valley study area over three consecutive years (2016-2018) to analyze the comparative spatio-temporal variation characteristics of N, P, and K stoichiometry in one-year-old branches of M. sieversii and their relationship with environmental variables. The findings revealed that the branch stoichiometric indexes of wild apple trees tended to exhibit moderate and weak variations at different altitudes and in different years; P exhibited the weakest variability and N:K exhibited the strongest variability. The year significantly impacted the five stoichiometric indexes, with the exception of P:K, whereas altitude had a significant impact only on N:P. The twig N, N:P, and N:K was also affected by the interaction of year and altitude. There were no significant differences between branch P (except for in 2017), K, and P:K at different altitudes, although they all displayed significant interannual changes. The branch N, N:P, and N:K all represented significant temporal and spatial variability; however, the changing trends differed. Both correlation analysis and NMDS analysis demonstrated that they own growth status of wild apple trees (dead branch rate, projective coverage, degree of disease and insect pests, and fruit amount), annual precipitation, and soil factors all affected branch stoichiometric characteristics to a certain extent; however, different stoichiometric indices exhibited different responses. In general, the better the plant growth status of wild apple trees, the lower the nutrient contents in one-year-old branches. Consequently, the branch stoichiometric characteristics of wild apple trees exhibit obvious variability at different altitude gradients and temporal scales, and the influencing factors are quite complex.

Key words: Malus sieversii, one-year-old branch, stoichiomtery, inter-annual variation, altitude, environmental factor

YAN Jingming,ZHOU Xiaobing,ZHANG Jing,TAO Ye. Variation in one-year-old branch stoichiometry of Malus sieversii at different altitudes and the influencing factors in Tianshan Mountains, China[J].Arid Zone Research, 2021, 38(2): 450-459.

Figures/Tables 6

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Fig. 2

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年份	海拔/m	N	P	K	N:P	N:K	P:K
2016	1300	19.1	13.6	27.3	18.1	28.4	19.7
	1400	25.4	11.2	16.4	23.1	25.2	11.7
	1500	16.5	13.3	21.9	15.0	21.6	23.5
	1600	23.6	4.9	12.6	27.5	25.5	11.8
2017	1300	20.4	15.1	22.8	13.7	26.7	21.6
	1400	23.1	8.6	17.9	23.5	26.8	14.2
	1500	24.2	14.6	17.7	28.8	28.4	13.5
	1600	22.5	8.9	18.5	22.7	26.7	14.7
2018	1300	15.6	11.7	12.0	14.3	22.2	12.5
	1400	23.2	10.4	21.9	22.8	27.9	19.5
	1500	21.9	14.1	22.2	16.0	31.7	20.3
	1600	25.6	11.7	35.9	24.1	42.9	25.7

因素	df	N	P	K	N:P	N:K	P:K
年份	3	3.90^*	29.85^**	10.98^**	6.88^*	5.64^**	0.70
海拔	2	2.60	0.73	0.32	3.74^*	1.15	0.49
年份×海拔	6	7.12^**	2.01	0.74	4.86^**	5.75^**	1.87

参数	N	P	K	N:P	N:K	P:K
DIP	0.109	0.218^*	0.083	0.012	0.017	0.028
Cov	-0.288^**	-0.372^**	-0.197^*	-0.095	-0.127	-0.087
DBR	0.170	0.187^*	0.189^*	0.081	0.034	-0.053
FA	-0.258^**	-0.241^**	-0.147	-0.159	-0.128	-0.033
Alt	-0.114	-0.067	-0.026	-0.045	-0.030	0.005
MAP	-0.114	0.138	0.190^*	-0.226^*	-0.215^*	-0.092
OC	0.110	-0.170	-0.098	0.212^*	0.124	-0.043
TN	0.366^**	0.186^*	0.133	0.236^**	0.174	-0.012
TP	0.231^**	0.258^**	0.217^*	0.063	0.011	-0.069
TK	0.008	-0.238^**	-0.177^*	0.139	0.146	0.038
AN	0.126	0.378^**	0.191^*	-0.122	-0.069	0.067
AP	0.284^**	-0.035	-0.051	0.276^**	0.247^**	0.045
AK	0.203^*	0.312^**	0.162	0.002	0.030	0.051
pH	-0.201^*	-0.126	-0.087	-0.125	-0.088	0.013
EC	0.355^**	0.427^**	0.239^**	0.089	0.099	0.046

参数	Axis 1	Axis 2
化学计量指标
N	0.730^**	0.873^**
P	0.552^**	-0.034
K	0.765^**	-0.273^**
N:P	0.420^**	0.944^**
N:K	0.103	0.928^**
P:K	-0.399^**	0.318^**
环境因子
MAP	-0.277^**	0.190^*
Cov	-0.322^**	-0.149
DBR	0.247^**	0.069
FA	-0.274^**	-0.172
OC	0.007	0.179^*
TN	0.320^**	0.260^**
TP	0.307^**	0.092
AN	0.215^*	-0.031
AP	0.140	0.294^**
AK	0.247^**	0.078
pH	-0.207^*	-0.148
EC	0.386^**	0.164
累积解释量/%	25.6	97.3

Variation in one-year-old branch stoichiometry of Malus sieversii at different altitudes and the influencing factors in Tianshan Mountains, China

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