水稻叶片气孔导度与冠层反射光谱的定量关系分析

doi:10.17521/cjpe.2006.0035

摘要/Abstract

摘要：

研究了不同土壤水氮条件下水稻(Oryza sativa)叶片气孔导度与冠层光谱反射特征的量化关系。结果表明,不同水分处理下,水稻不同叶位气孔导度变化趋势为:GsL1>GsL2>GsL3>GsL4。高于W3水分条件下,高氮处理的叶片气孔导度高于低氮处理,而低于W3水分条件下,高低氮处理条件下叶片气孔导度差异不显著。发现比值指数R(1 650,760)与不同叶位叶片及不同层次叶片气孔导度的相关性大小为:GsL1>GsL12>GsL123>GsL1234>GsL2>GsL3>GsL4(水稻顶部自上而下第一、二、三、四叶以及自上而下顶部2张、3张、4张叶片的气孔导度值分别表示为:GsL1、GsL2、GsL3、GsL4、GsL12、GsL123和GsL1234),而顶1叶气孔导度与叶面积指数的乘积(冠层叶片气孔导度)同比值指数R(1 650,760)相关程度更高。R(1 650,760)与顶1叶和冠层叶片气孔导度之间皆呈极显著的幂函数负相关。利用不同年份的不同水稻试验对两者的监测模型进行了检验,模型的检验误差RMSE分别为0.05和0.24,表明比值指数R(1 650,760)可以较好地监测不同水氮条件下水稻叶片的气孔开闭特征。

关键词: 水稻, 气孔导度, 反射光谱, 植被指数, 监测

Abstract:

This investigation was conducted to determine the quantitative relationship between leaf stomatal conductance and canopy spectral reflectance of rice crops under different water and nitrogen regimes. Results showed that leaf stomatal conductance on main stem leaves under different water treatments decreased in the following order throughout the growth cycle: GsL1 > GsL2 > GsL3 > GsL4. The leaf stomatal conductance in the high nitrogen treatment was higher than in the low nitrogen treatment when the soil water content was above W3. Below W3, there were no significant differences in leaf stomatal conductance between the high and low nitrogen treatments. It also was found that the correlation between the ratio index R(1 650, 760) and stomatal conductance averaged over different layer leaves was the following: GsL1 > GsL12 > GsL123 > GsL1234 > GsL2 > GsL3 > GsL4 (GsL1, GsL2, GsL3, GsL4, GsL12, GsL123 and GsL1234 denoted the first, second, third, fourth leaf and two leaves, three leaves, four leaves from top). The best relationship was between canopy stomatal conductance (the product of GsL1 and LAI) and R(1 650, 760). The ratio index R(1 650, 760) showed a power relationship with both stomatal conductance of L1 and canopy leaf stomatal conductance with an RMSE of 0.05 and 0.24, respectively. It was concluded that the ratio index R can be used to monitor leaf stomatal conductance during different growth stages of rice.

Key words: Rice, Stomatal conductance, Reflectance spectra, Vegetation index, Monitoring

田永超, 朱艳, 姚霞, 周昌俊, 曹卫星. 水稻叶片气孔导度与冠层反射光谱的定量关系分析. 植物生态学报, 2006, 30(2): 261-267. DOI: 10.17521/cjpe.2006.0035

TIAN Yong_Chao, ZHU Yan, YAO Xia, ZHOU Chang_Jun, CAO Wei_Xing. QUANTITATIVE RELATIONSHIPS BETWEEN CANOPY SPECTRAL REFLECTANCE AND LEAF STOMATAL CONDUCTANCE IN RICE. Chinese Journal of Plant Ecology, 2006, 30(2): 261-267. DOI: 10.17521/cjpe.2006.0035

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2006.0035

https://www.plant-ecology.com/CN/Y2006/V30/I2/261

图/表 9

图1 拔节期(A)、灌浆期(B)不同水分条件下水稻不同叶位叶片的气孔导度

Fig.1 Leaf stomatal conductance in different leaf positions at jointing (A) and filling (B) of rice under varied water treatments

图2 拔节期不同水氮条件下水稻叶片的气孔导度(A)和比值指数R(1 650,760)(B)

Fig.2 Stomatal conductance on the first leaf from top (A) and canopy ratio index R(1 650,760) (B) at jointing of rice under varied water and nitrogen treatments

图3 拔节期不同水氮条件下水稻叶片叶绿素含量(A)和含水量(B)

Fig.3 Leaf chlorophlly content (SPAD value) on the first leaf from top (A) and canopy leaf water content (B) at jointing of rice under varied water and nitrogen treatments

图4 拔节期不同水氮条件下水稻叶面积指数(A)和修改型二次土壤调整指数(B)

Fig.4 Leaf area index (LAI) (A) and the second modified SAVI2 (MSAVI2)(B) at jointing of rice under varied water and nitrogen treatments

表1 不同层次水稻叶片气孔导度与冠层反射光谱的相关性(n=35)

Table 1 Correlation coefficient between canopy reflectance and leaf stomatal conductance of different leaf layers in rice (n=35)

		GsL1	GsL2	GsL3	GsL4	GsL12	GsL123	GsL1234
R(1 650, 760)	拔节期Jointing	0.88^**	0.63^**	0.32	0.11	0.86^**	0.83^**	0.77^**
	抽穗期Heading	0.86^**	0.68^**	0.30	0.17	0.84^**	0.78^**	0.74^**
	灌浆期Filling	0.87^**	0.66^**	0.28	0.23	0.85^**	0.82^**	0.78^**

图5 水稻顶1叶气孔导度与比值指数R(1 650, 760)之间的关系

Fig.5 Relationship between stomatal conductance of first leaf from top in rice and ratio index R(1 650, 760)

图6 水稻冠层叶片气孔导度与比值指数R(1 650, 760)之间的关系

Fig.6 Relationship between canopy leaf stomatal conductance of rice and ratio index R(1 650, 760)

图7 水稻顶1叶气孔导度实测值与预测值的比较

Fig.7 Comparison of measured with predicted stomatal conductance of the first leaf in rice under different soil water and nitrogen conditions

图8 水稻冠层叶片气孔导度实测值与预测值的比较图例见图7 Ledgends see Fig. 7

Fig.8 Comparison of measured with predicted canopy leaf stomatal conductance of rice under different soil water and nitrogen conditions

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