环境因子对常绿阔叶树种脱耦联系数及冠层气孔导度估算的影响

doi:10.17521/cjpe.2018.0176

植物生态学报 ›› 2018, Vol. 42 ›› Issue (12): 1179-1191.DOI: 10.17521/cjpe.2018.0176

环境因子对常绿阔叶树种脱耦联系数及冠层气孔导度估算的影响

张振振^1,^*(),赵平²,赵秀华²,张锦秀¹,朱丽薇²,欧阳磊²,张笑颜¹

1 浙江师范大学地理与环境科学学院, 浙江金华 231004
2 中国科学院华南植物园, 广州 510650

收稿日期:2018-07-30 修回日期:2018-10-23 出版日期:2018-12-20 发布日期:2019-04-04
通讯作者: 张振振
基金资助:
国家自然科学基金(41630752);国家自然科学基金(41701226);国家自然科学基金(41030638)

Impact of environmental factors on the decoupling coefficient and the estimation of canopy stomatal conductance for ever-green broad-leaved tree species

ZHANG Zhen-Zhen^1,^*(),ZHAO Ping²,ZHAO Xiu-Hua²,ZHANG Jin-Xiu¹,ZHU Li-Wei²,OUYANG Lei²,ZHANG Xiao-Yan¹

1 School of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, Zhejiang 231004, China
2 South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China

Received:2018-07-30 Revised:2018-10-23 Online:2018-12-20 Published:2019-04-04
Contact: Zhen-Zhen ZHANG
Supported by:
Supported by the National Natural Science Foundation of China(41630752);Supported by the National Natural Science Foundation of China(41701226);Supported by the National Natural Science Foundation of China(41030638)

摘要/Abstract

摘要：

精确模拟冠层气孔导度(G_S)对于评估区域蒸散具有重要意义。该研究选择两种常见的人工阔叶树种尾叶桉(Eucalyptus urophylla, 外来种)和木荷(Schima superba, 本地种)作为研究对象, 利用K?stner法和修订的Penman-Monteith公式计算冠层平均气孔导度(分别定义为G_S1和G_S2)。研究还分析了环境因子对冠层脱耦联系数(Ω)的影响, 并用其来评价两种方法模拟的冠层气孔导度的合理性。结果表明, 两个树种冠层气孔导度均与气象条件耦合较好(尾叶桉: Ω = 0.10 ± 0.03, 木荷: Ω = 0.17 ± 0.03)。主成分分析显示, 光合有效辐射(PAR)以及水汽压亏缺(D)显著影响Ω的大小, 而风速(u)的影响较小。单因素分析则发现各环境因子与Ω之间的相关性并不显著。边界线分析表明D和PAR的增加使得Ω最终趋向于一个与树种有关的稳定值(木荷≈ 0.20, 尾叶桉≈ 0.05), 而Ω随u的增加呈幂指数下降。与木荷相比, 尾叶桉具有更高的气孔导度(尾叶桉和木荷的G_S2年平均值分别为(33.42 ± 9.37) mmol·m ^-2·s ^-1和(23.40 ± 2.03) mmol·m ^-2·s ^-1), 并且尾叶桉和木荷的G_S1与G_S2的线性拟合斜率分别为0.92 (R ² ≈ 0.70)和0.98 (R ² ≈ 0.76) , 表明G_S1比G_S2高估了冠层气孔导度。另外, G_S1和G_S2对水汽压亏缺的敏感性与参比气孔导度(G_Siref, D = 1 kPa时的气孔导度)的比值Pi与Ω紧密相关。根据统计, 尾叶桉和木荷的G_S1估计值在Ω = 0.05-0.15 (83.1%的数据)和0.10-0.20 (47.8%的数据)之间时是相对可靠的。

关键词: 植物蒸腾, 冠层导度, 脱耦联系数, 环境因子

Abstract:

Aims Accurate simulation of canopy stomatal conductance (G_S) is quite important for the assessment of regional evapotranspiration.

Methods In this study, two planted broad-leaved tree species, Eucalyptus urophylla (exotic species) and Schima superba (native species), were chosen to estimate their G_S with two different methods of K?stner (G_S1) and inversed Penman-Monteith equation (G_S2). The effect of environmental factors on canopy decoupling coefficient (Ω) was evaluated before they were adopted to assess the reasonability of G_Ssimulated by the two methods.

Important findings Results showed that the G_Sof the two tree species was well coupled with meteorological conditions (Ω = 0.10 ± 0.03 for E. urophylla and 0.17 ± 0.03 for S. superba). Principal component analysis showed that photosynthetically active radiation (PAR) and vapor pressure deficit (D) significantly dominated the variations of Ω, while the effect of wind speed (u) was very weak. Multivariate correlation analysis also found weak relations between those environmental factors and Ω. Boundary line analysis revealed that the increase of D and PAR would eventually force Ω approaching a constant value as determined by tree species (S. superba ≈ 0.20, E. urophylla ≈ 0.05), while Ω decreases exponentially with the increase of u. Compared with S. superba, E. urophylla has higher G_S.The annual averages G_S2 of E. urophylla and S. superba were (33.42 ± 9.37) mmol·m^-2·s^-1 and (23.40 ± 2.03) mmol·m^-2·s^-1, respectively. Linear fitting showed that the G_S2/G_S1 ratio of E. urophylla and S. superba was 0.92 (R² ≈ 0.70) and 0.98 (R² ≈ 0.76), respectively, implying the overestimated canopy stomatal conductance for G_S1 (p < 0.01). In addition, the ratio of the sensitivity of canopy stomatal conductance to vapor pressure deficit to stomatal conductance at D = 1 kPa (G_Siref) for G_S1 and G_S2 is closely related to Ω. Based on the estimation, G_S1 was relatively reliable when Ω = 0.05-0.15 (83.1% of all the data) and 0.10-0.20 (47.8% of all the data) for E. urophylla and S. superba.

Key words: plant transpiration, canopy stomatal conductance, the decoupling coefficient, environmental factor

张振振, 赵平, 赵秀华, 张锦秀, 朱丽薇, 欧阳磊, 张笑颜. 环境因子对常绿阔叶树种脱耦联系数及冠层气孔导度估算的影响. 植物生态学报, 2018, 42(12): 1179-1191. DOI: 10.17521/cjpe.2018.0176

ZHANG Zhen-Zhen, ZHAO Ping, ZHAO Xiu-Hua, ZHANG Jin-Xiu, ZHU Li-Wei, OUYANG Lei, ZHANG Xiao-Yan. Impact of environmental factors on the decoupling coefficient and the estimation of canopy stomatal conductance for ever-green broad-leaved tree species. Chinese Journal of Plant Ecology, 2018, 42(12): 1179-1191. DOI: 10.17521/cjpe.2018.0176

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https://www.plant-ecology.com/CN/Y2018/V42/I12/1179

图/表 11

表1 木荷和为尾叶桉林区参数

Table 1 Stand parameters of Schima superba and Eucalyptus urophylla

树种 Species	密度 Density	n	DBH	H	A_s	LAI	l	A_l	A_c
木荷 S. superba	603	21	15.5 (1.3)^a	12.7 (0.5)^a	0.018 (0.002)^a	4.3 (0.1)^a	9.1 (0.4)^a	66.6 (10.2)^a	20.7 (2.9)^a
尾叶桉 E. urophylla	1 375	15	10.1 (0.6)^b	11.5 (0.8)^a	0.007 (0.001)^b	1.5 (0.1)^b	10.9 (0.2)^b	21.0 (2.7)^b	4.0 (0.2)^b

图1 研究期间的气象条件。A, 光合有效辐射(PAR)。B, 水汽压亏缺(D)。C, 空气温度(Ta)。D, 土壤含水量(SWC)。

Fig. 1 Meteorological conditions during study periods. A, Photosynthetic photon flux density (PAR). B, Vapor pressure deficit (D). C, Daily mean air temperature (Ta). D, Soil water content (SWC).

图2 尾叶桉林和木荷林每月脱耦联系数(Ω)。

Fig. 2 Monthly decoupling coefficients (Ω) of Eucalyptus urophylla and Schima superba stands.

图3 尾叶桉林和木荷林光合有效辐射(PAR)、水汽压亏缺(D)和脱耦联系数(Ω)日变化(平均值±标准误差)。

Fig. 3 Diurnal course of photosynthetically active radiation (PAR, μmol m-2·s-1) (A, B), vapor pressure deficit (D, kPa) (C, D), and decoupling coefficient (Ω) (E, F) for Eucalyptus urophylla and Schima superba stands (mean ± SE) respectively.

图4 尾叶桉林和木荷林中脱耦联系数(Ω)和光合有效辐射(PAR)(A, D)、水汽压亏缺(D) (B, E)及风速(C, F)之间的关系。图中仅显示了边界线数据区域。

Fig. 4 Relationships between decoupling coefficient (Ω) and (A, D) photosynthetically active radiation (PAR,) as well as (B, E) vapor pressure deficit (D), (C, F) wind speed in Eucalyptus urophylla and Schima superba stands. Only boundary line data area shown in the figure.

图5 使用修订的Penman-Monteith公式估算的冠层气孔导度及相关的脱耦联系数(Ω)。

Fig. 5 Decoupling coefficient (Ω) in relation to canopy stomatal conductance estimated with the inverse Penman-Monteith equation (GS2).

图6 根据K?stner公式(GS1, ○)和Penman-Monteith逆公式(GS2, △)估计的尾叶桉林(A-D)和木荷林(E-H)冠层气孔导度(GS)的日变化。

Fig. 6 Daily variation of canopy stomatal conductance (GS) estimated from the K?stner equation (GS1, ○) and the inverse Penman-?Monteith equation (GS2, △) for Eucalyptus urophylla (A-D) and Schima superba (E-H).

图7 尾叶桉和木荷利用K?stner法计算的气孔导度(GS1)和利用Penman-Monteith公式计算的气孔导度(GS2)之间的关系。

Fig. 7 Relationship between stomatal conductance estimated from the K?stner equation (GS1) and the inverse Penman-Monteith equation (GS2) for Eucalyptus urophylla and Schima superba.

图8 冠层气孔导度(GS)对水汽压亏缺的敏感性(-m)与水汽压亏缺(D) = 1 kPa时的GS (GSref)之间的比例变化。数值来自一个月数据子集的边界线拟合。对于每种方法组合, 线是最小二乘拟合(p < 0.001)。GS1: 直线和空心圆, GS2: 点划线和星号。

Fig. 8 Proportional increase of sensitivity of tree crown-level stomatal conductance (GS) to vapor pressure deficit (-m) with the conductance at vapor pressure deficit (D) = 1 kPa (GSref). Values are from boundary line fits of one month subsets of data. Lines are the least-square fit (p < 0.001) for each method combination. GS1, line and open circle; GS2, dash dot and asterisk

表2 文中常用变量及其缩写

Table 2 Common variables and their abbreviations

变量 Variables	缩写 Abbreviations	单位 Units
冠层气孔导度 Canopy stomatal conductance	G_S	mmol·m^-2·s^-1
冠层脱耦联系数 Canopy decoupling coefficient	Ω	无纲量 No dimension
光合有效辐射 Photosynthetically active radiation	PAR	μmol·m^-2·s^-1
水汽压亏缺 Water vapor deficit	D	kPa
风速 Wind speed	u	m·s^-1
水汽导度 Water vapor conductance	G_T	mmol·m^-2·s^-1
冠层导度 Canopy conductance	g_c	mmol·m^-2·s^-1
空气动力学导度 Aerodynamic conductance	g_a	mmol·m^-2·s^-1
树木蒸腾速率 Tree transpiration rates	E	g·m^-2·s^-1
叶面积指数 Leaf area index	LAI	m²·m^-2
胸径 Diameter at breast height	DBH	cm
树高 Tree height	H	m
边材面积 Sap wood area	A_S	m²
总叶面积 Total leaf area	A_l	m²
气动阻力 Stomatal resistance	r_a	s·m^-1
土壤含水量 Soil water content	SWC	m³·m^-3

表3 不同冠层脱耦联系数(Ω)区间范围尾叶桉和木荷的冠层气孔导度对水汽压亏缺的敏感性(-m)和参比气孔导度(GSiref)之间的比例(Pi)

Table 3 The proportion between the ratio of the sensitivity of canopy stomatal conductance to vapor pressure deficit (-m) and stomatal conductance at vapor pressure deficit = 1 kPa (GSiref) (Pi) for Ecalyptus urophylla and Schima superba at each canopy decoupling coefficient (Ω) interval

树种 Species	Ω区间 Ω interval	P_i
	0.00-0.05	-
	0.05-0.10	0.57 (0.06)
尾叶桉 E. urophylla	0.10-0.15	0.58 (0.06)
尾叶桉 E. urophylla	0.15-0.20	1.04 (0.16)^**
	0.20-0.25	8.32 (7.62)^**
	0.25-0.3	1.43(5.02)^**
	0.00-0.05	-
	0.05-0.10	0.75 (0.13)^**
木荷 S. superba	0.10-0.15	0.61 (0.10)
木荷 S. superba	0.15-0.20	0.58 (0.08)
	0.20-0.25	0.70 (0.13)^**
	0.25-0.30	1.21 (0.40)^**

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环境因子对常绿阔叶树种脱耦联系数及冠层气孔导度估算的影响

Impact of environmental factors on the decoupling coefficient and the estimation of canopy stomatal conductance for ever-green broad-leaved tree species

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