北京密云油松林下灌木小叶鼠李叶片资源利用效率季节变异及环境调控

doi:10.11707/j.1001-7488.LYKX20220867

Abstract

Abstract:

Objective: This study aims to clarify the trade-offs between light, nitrogen and water use efficiency (RUEs) in the leaves of the understorey shrub Rhamnus parvifoliaand their environmental regulation mechanisms. Method: We analyzed the seasonal dynamics of intrinsic water use efficiency (WUE_i), nitrogen use efficiency (NUE) and light use efficiency (LUE) as well as the trade-offs among RUEs of a dominant understory shrub, R. parvifolia, leaves through season-long in-situ measurements of the light response curve and leaf functional traits along with simultaneous environmental measurements from June to October, 2021 in Miyun, Beijing, China. Result: 1) The result showed that the maximum WUE_i, NUE, and LUE in growing season fluctuated with values of 107.3 μmol·mol^?1, 18.35 μmol·g^?1s^?1, and 0.087 mol·mol^?1, respectively, with coefficient of variation (CV) being 24.91%, 39.12%, and 12.6%. 2) In the middle of the growing season, under the wet condition with relative extractable soil water (REW) greater than 0.4, there were higher NUE and lower WUE_i. The NUE had opposite trend to WUE_i (P < 0.05) and varied synergistically with LUE ( P < 0.05). 3) The WUE _i was positively correlated with leaf mass per unit area (LMA) (P < 0.05) and negatively correlated with transpiration rate (Tr, P < 0.05), while NUE was negatively correlated with LMA and leaf thickness (LT, P < 0.05) and positively correlated with Tr ( P < 0.05). Increases in air temperature ( T_a), photosynthetically active radiation (PAR) and diffuse radiation (R_dif) all contributed to increased LUE (P < 0.05). Conclusion: It has been found that WUE_i and NUE are decoupled from soil water content and closely relate to LMA and Tr in wet period and limited light. Increasing radiation and T_a promotes the light utilization efficiency of leaf, and diffuse radiation raises the photosynthetic capacity of leaf. There is a trade-off between RUEs. The NUE and WUE_i can not simultaneously maximize in the growing season, but under wet condition and low light, NUE and LUE change in the same direction, both fluctuating in the middle of the growing season and gradually decrease at the end of the growing season. The results of this study are important additions to the in-depth understanding of the adaptation strategies of temperate plant communities under climate change.

Key words: leaf functional trait, resource use efficiency, light response curve, understory shrub, Rhamnus parvifolia

CLC Number:

S718.43

Hongxian Zhao,Tong Su,Ruifu Wang,Yanli Sun,Yonglong Gao,Jichao Wei,Xinhao Li,Yun Tian,Xin Jia,Tianshan Zha. Seasonal Variation and Environmental Control of Leaf Resource Use Efficiencies of an Understory Shrub, Rhamnus parvifolia in Pinus tabuliformis Forest in Miyun, Beijing[J]. Scientia Silvae Sinicae, 2023, 59(7): 1-11.

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缩写 Abbreviation	参数全称 Full name of parameters	单位 Unit
NUE	氮利用效率 Nitrogen use efficiency	μmol·g^?1s^?1
WUE_i	内禀水分利用效率 Intrinsic water use efficiency	μmol·mol^?1
LUE	光利用效率 Light use efficiency	mol·mol^?1
T_a	空气温度 Air temperature	℃
REW	土壤相对可利用含水量 Relative extractable soil water
PAR	光合有效辐射 Photosynthetically active radiation	μmol·m^?2s^?1
R_dif	散射辐射 Diffuse radiation	W·m^?2
SWC	土壤含水量 Soil water content	m³·m^?3
VPD	饱和水汽压差 Vapor pressure deficit	kPa
Tr	蒸腾速率 Transpiration rate	mmol·m^?2s^?1
P_nmax	最大净光合速率 Maximum net photosynthetic rate	μmol· m^?2s^?1
g_s	气孔导度 Stomatal conductance	mol·m^?2s^?1
N_mass	单位质量叶片氮含量 Leaf nitrogen content per unit mass	g·g^?1
LMA	比叶质量 Leaf mass per unit area	g·m^?2
LT	叶厚度 Leaf thickness	mm

相关指标 Index	内禀水分利用效率WUE_i	光利用效率LUE	氮利用效率NUE
内禀水分利用效率WUE_i	1
光利用效率LUE	0.06（?0.52）	1
氮利用效率NUE	?0.63（?0.71）	0.47（0.78*）	1

相关指标Index	土壤含水量SWC	饱和水汽压差VPD	散射辐射R_dif
最大净光合速率P_nmax	0.49	?0.11	0.63*
气孔导度g_s	0.29	?0.16	0.36

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Seasonal Variation and Environmental Control of Leaf Resource Use Efficiencies of an Understory Shrub, Rhamnus parvifolia in Pinus tabuliformis Forest in Miyun, Beijing

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