Response of nutrient characteristics of Achnatherum splendens leaves to different levels of nitrogen and phosphorus addition

doi:10.17521/cjpe.2020.0127

Abstract

Abstract:

Aims The nutrient characteristics of nitrogen (N) and phosphorus (P) in plant leaves are affected by soil available N, P contents and soil N:P. However, little is known about the effects of changes in soil N, P contents and N:P on N, P stoichiometry in leaves and nutrient resorption efficiency.
Methods In this study, pot experiments were conducted to explore the response of the stoichiometry and nutrient resorption characteristics of Achnatherum splendens leaves to three levels of nutrient addition (low, 1.5 g·m^-2·a^-1; moderate, 4.5 g·m^-2·a^-1; and high, 13.5 g·m^-2·a^-1) and N:P (5, 15, 25).
Important findings The results showed that higher level of nutrient addition significantly increased the P contents in green leaves and N, P contents in senescent leaves, but significantly deceased the N resorption efficiency (NRE) and P resorption efficiency (PRE). The increases in soil N:P significantly decreased the P contents in senescent leaves and NRE, but increased N:P in green and senescent leaves and PRE. At the same nutrient addition level, soil N:P was significantly positively correlated with PRE, but showed no significant correlation with NRE. At the same level of N:P, the level of nutrition addition was negatively correlated with NRE, but exhibited no significant correlation with PRE. The changes in plant demand for N and P caused by changing environment can be indicated effectively by plant leaf NRE:PRE, and the characteristics of nutrient stoichiometry and resorption of A. splendens leaves are affected together by nutrient addition levels and soil N:P.

Key words: nutrient resorption, nutrient stoichiometry, Achnatherum splendens, soil nutrients, nitrogen addition

LI Jun-Jun, LI Meng-Ru, QI Xing-E, WANG Li-Long, XU Shi-Jian. Response of nutrient characteristics of Achnatherum splendens leaves to different levels of nitrogen and phosphorus addition[J]. Chin J Plant Ecol, 2020, 44(10): 1050-1058.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2020.0127

https://www.plant-ecology.com/EN/Y2020/V44/I10/1050

Figures/Tables 7

References 48

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氮磷比 N:P	氮、磷供应量 N and P supply amount (g·m^-2·a^-1)
氮磷比 N:P	低养分添加水平 Low nutrient addition level	中养分添加水平 Moderate nutrient addition level	高养分添加水平 High nutrient addition level
5	1.50/0.30	4.50/0.90	13.50/2.70
15	1.50/0.10	4.50/0.30	13.50/0.90
25	1.50/0.06	4.50/0.18	13.50/0.54

氮磷比 N:P	氮、磷供应量 N and P supply amount (g·m^-2·a^-1)
氮磷比 N:P	低养分添加水平 Low nutrient addition level	中养分添加水平 Moderate nutrient addition level	高养分添加水平 High nutrient addition level
5	1.50/0.30	4.50/0.90	13.50/2.70
15	1.50/0.10	4.50/0.30	13.50/0.90
25	1.50/0.06	4.50/0.18	13.50/0.54

氮磷比 N:P	N (g)		N (s)		P (g)		P (s)		N:P (g)		N:P (s)		NRE		PRE		NRE:PRE
氮磷比 N:P	p	R	p	R	p	R	p	R	p	R	p	R	p	R	p	R	p	R
5	0.200	0.470	0.020	0.740	0.030	0.730	0.140	0.540	0.950	0.020	0.690	0.160	0.410	-0.310	0.080	0.610	0.450	-0.290
15	0.230	-0.450	0.005	0.830	0.005	0.830	0.040	0.700	0.700	0.180	0.010	0.790	0.040	-0.630	0.890	-0.050	0.010	-0.790
25	0.330	-0.370	0.020	0.730	0.020	0.750	0.990	-0.010	0.020	0.740	0.030	0.720	0.000	-0.920	0.900	0.050	0.002	-0.880

氮磷比 N:P	N (g)		N (s)		P (g)		P (s)		N:P (g)		N:P (s)		NRE		PRE		NRE:PRE
氮磷比 N:P	p	R	p	R	p	R	p	R	p	R	p	R	p	R	p	R	p	R
5	0.200	0.470	0.020	0.740	0.030	0.730	0.140	0.540	0.950	0.020	0.690	0.160	0.410	-0.310	0.080	0.610	0.450	-0.290
15	0.230	-0.450	0.005	0.830	0.005	0.830	0.040	0.700	0.700	0.180	0.010	0.790	0.040	-0.630	0.890	-0.050	0.010	-0.790
25	0.330	-0.370	0.020	0.730	0.020	0.750	0.990	-0.010	0.020	0.740	0.030	0.720	0.000	-0.920	0.900	0.050	0.002	-0.880

养分添加水平 Nutritional addition level	N (g)		N (s)		P (g)		P (s)		N:P (g)		N:P (s)		NRE		PRE		NRE:PRE
养分添加水平 Nutritional addition level	p	R	p	R	p	R	p	R	p	R	p	R	p	R	p	R	p	R
低 Low	0.660	-0.170	0.390	0.330	0.020	0.740	0.560	-0.230	0.410	0.320	0.060	0.290	0.260	-0.420	0.000	0.940	0.030	-0.720
中 Moderate	0.010	0.910	0.330	0.370	0.240	0.440	0.580	-0.220	0.060	0.650	0.045	0.740	0.490	0.270	0.010	0.740	0.400	-0.320
高 High	0.180	-0.490	0.200	0.470	0.070	-0.630	0.006	0.830	0.420	-0.310	0.005	0.840	0.070	-0.620	0.010	0.940	0.010	-0.790