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

林业科学 ›› 2023, Vol. 59 ›› Issue (7): 1-11.doi: 10.11707/j.1001-7488.LYKX20220867

• 前沿与重点：木本植物功能性状 • 上一篇下一篇

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

赵洪贤^1,²(),苏同³,王瑞福³,孙艳丽⁴,高永龙⁴,隗骥超⁵,李鑫豪^1,²,田赟^1,²,贾昕^1,²,查天山^1,^2,*()

1. 北京林业大学水土保持学院　北京 100083
2. 林木资源高效生产全国重点实验室　北京 100083
3. 怀柔区营林造林管护中心　北京 101499
4. 北京市园林绿化规划和资源监测中心　北京 100193
5. 北京绿林盛源绿化工程有限公司　北京 102400

收稿日期:2023-02-24 出版日期:2023-07-25 发布日期:2023-09-08
通讯作者: 查天山 E-mail:hongxianzhao123@163.com;tianshanzha@bjfu.edu.cn
基金资助:
国家重点研发计划（2020YFA0608100）；北京园林绿化生态系统监测网络（GJH-2023-027）

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

Hongxian Zhao^1,²(),Tong Su³,Ruifu Wang³,Yanli Sun⁴,Yonglong Gao⁴,Jichao Wei⁵,Xinhao Li^1,²,Yun Tian^1,²,Xin Jia^1,²,Tianshan Zha^1,^2,*()

1. School of Soil and Water Conservation, Beijing Forestry University　Beijing 100083
2. State Key Laboratory of Efficient Production of Forest Resources　Beijing 100083
3. Forestation Management Center of Huairou District　Beijing 101499
4. The Beijing Center for Forest Resource Planning and Monitoring　Beijing 100193
5. Beijing Lülin Shengyuan Greening Engineering Co., Ltd.　Beijing 102400

Received:2023-02-24 Online:2023-07-25 Published:2023-09-08
Contact: Tianshan Zha E-mail:hongxianzhao123@163.com;tianshanzha@bjfu.edu.cn

摘要/Abstract

摘要：

目的: 探究小叶鼠李叶片的光、氮、水资源利用效率（RUEs）在较长时间尺度（季节）上的变化特征，分析环境变化对RUEs季节动态的影响、叶片功能性状与RUEs的关系以及不同RUEs间的权衡关系。方法: 2021年6—10月，在北京密云山区，以当地林下优势灌木小叶鼠李为研究对象，对其光合参数和环境因子进行连续原位观测，使用LI-6800便携式光合测定仪测量小叶鼠李叶片光合光响应曲线的特征参数，同时测量其叶片功能性状，结合观测的环境因子数据，分析小叶鼠李叶片内禀水分利用效率（WUE_i）、氮利用效率（NUE）和光利用效率（LUE）季节动态变化的影响因素及RUEs间的权衡关系。结果: 1）小叶鼠李在生长期内WUE_i、NUE、LUE的最大值分别为107.3 μmol·mol^?1、18.35 μmol·g^?1s^?1、0.087 mol·mol^?1，其季节变异系数（CV）分别为24.91%、39.12%、12.6%。2）在生长季中期，土壤相对可利用含水量充足的湿润条件下（REW > 0.4），小叶鼠李具有较大的NUE和较小的WUE _i，NUE与WUE_i的变化趋势相反（P < 0.05），与LUE变化趋势相同（ P < 0.05）。3） WUE _i与比叶质量（LMA）正相关（P < 0.05），与蒸腾速率（Tr）负相关（ P < 0.05）；而NUE与LMA和叶厚度（LT）负相关（ P < 0.05），与蒸腾速率（Tr）正相关（ P < 0.05）；空气温度（ T_a）、光合有效辐射（PAR）和散射辐射（R_dif）增加均会促进增加叶片LUE（P < 0.05）。结论: 在土壤湿润、光照条件受限的条件下，林下优势灌木小叶鼠李叶片的WUE_i、NUE均与土壤含水量解耦，与比叶质量和蒸腾速率关系密切；辐射强度和空气温度增加均会提高叶片的光、氮利用效率，且散射辐射增加也能提高林下灌木的光合能力。小叶鼠李叶片不同RUEs之间存在权衡关系，在生长季内不会同时出现最大化的WUE_i和NUE，在土壤湿润、光照减少的条件下，NUE与LUE变化趋势一致，均在生长季中期波动变化，生长季末期逐渐降低。

关键词: 叶片功能性状, 资源利用效率, 光响应曲线, 林下灌木, 小叶鼠李

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

中图分类号:

S718.43

赵洪贤,苏同,王瑞福,孙艳丽,高永龙,隗骥超,李鑫豪,田赟,贾昕,查天山. 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[J]. 林业科学, 2023, 59(7): 1-11.

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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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

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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