Partitioning wheat field evapotranspiration using Keeling Plot method and continuous atmospheric vapor δ18O data

doi:10.3773/j.issn.1005-264x.2010.02.008

Abstract

Abstract:

Aims Stable isotopes technique and Keeling Plot relationship offer great promise for partitioning evapotranspiration (ET), which can help us better understand the hydrologic cycle within terrestrial ecosystems. Our objectives are to evaluate the Keeling Plot method in ET partitioning using in situ continuous δ¹⁸O data and find the fractional contribution of crop transpiration to total ET in a winter wheat (Triticum aestivum) field.

Methods Field experiments were conducted at Luancheng Agro-ecology Station, Chinese Academy of Sciences. A hydrogen and oxygen isotopes in situ measurement system based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) was used to obtain the continuous atmospheric vapor δ¹⁸O data. Other measurements were made with the eddy covariance technique, cryogenic vacuum distillation and stable isotope ratio mass spectrometry.

Important findings An analysis on the Keeling Plot relationships based on data from different time intervals in one daytime showed that the Keeling Plot would be better when using the midday time interval data to build Keeling Plot, which inferred that the plant transpiration isotopic steady-state (ISS) can be more easily obtained during midday when plant transpiration flux is generally largest. ISS was not always satisfied in field conditions, especially when mature wheat suffered from water stress. Using isotopic partitioning, we estimated transpiration contributed roughly 94%-99% to the total ET during the field measurement period, which indicated plant transpiration dominated local ET.

Key words: flux partitioning, Keeling Plot, stable isotopes, TDLAS

YUAN Guo-Fu, ZHANG Na, SUN Xiao-Min, WEN Xue-Fa, Zhang Shi-Chun. Partitioning wheat field evapotranspiration using Keeling Plot method and continuous atmospheric vapor δ¹⁸O data[J]. Chin J Plant Ecol, 2010, 34(2): 170-178.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2010.02.008

https://www.plant-ecology.com/EN/Y2010/V34/I2/170

Figures/Tables 6

References 25

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DOY	h (%)	δ_S(‰)	δ_a(‰)	α_v/l	Δξ (‰)	δ_E (‰)
97	53.22	-3.612	-10.661	0.990 4	13.332	-43.22
100	56.70	-3.284	-12.581	0.990 3	12.342	-40.78
102	74.78	-3.307	-14.542	0.989 5	7.188	-38.89
112	72.70	-8.752	-17.561	0.989 9	7.781	-49.05
115	43.72	-6.631	-10.364	0.990 2	16.041	-47.90
120	72.39	-3.346	-8.814	0.990 6	7.869	-49.98
125	67.52	-3.501	-9.855	0.990 1	9.256	-47.82
131	63.79	-3.028	-13.670	0.989 9	10.321	-39.28
134	70.46	-4.898	-13.876	0.989 9	8.419	-44.55
139	57.80	-3.556	-10.869	0.990 1	12.028	-44.25
146	90.12	-2.104	-8.351	0.990 4	2.815	-68.72
149	48.31	-0.305	-10.913	0.990 4	14.732	-36.34

DOY	h (%)	δ_S(‰)	δ_a(‰)	α_v/l	Δξ (‰)	δ_E (‰)
97	53.22	-3.612	-10.661	0.990 4	13.332	-43.22
100	56.70	-3.284	-12.581	0.990 3	12.342	-40.78
102	74.78	-3.307	-14.542	0.989 5	7.188	-38.89
112	72.70	-8.752	-17.561	0.989 9	7.781	-49.05
115	43.72	-6.631	-10.364	0.990 2	16.041	-47.90
120	72.39	-3.346	-8.814	0.990 6	7.869	-49.98
125	67.52	-3.501	-9.855	0.990 1	9.256	-47.82
131	63.79	-3.028	-13.670	0.989 9	10.321	-39.28
134	70.46	-4.898	-13.876	0.989 9	8.419	-44.55
139	57.80	-3.556	-10.869	0.990 1	12.028	-44.25
146	90.12	-2.104	-8.351	0.990 4	2.815	-68.72
149	48.31	-0.305	-10.913	0.990 4	14.732	-36.34

DOY	δ_E	δ_x (std)	δ_ET1	δ_ET2	δ_ET3	δ_ET4
97	-43.22	-6.621±0.8	-9.219 9	-6.714 9	-5.733 5	-8.104 9
100	-40.78	-7.124±0.1	-0.601 1	-7.507 4	-7.153 6	-0.918 2
115	-47.90	-7.080±0.06	-3.850 0	-9.197 2	-6.295 4	-8.726 8
120	-49.98	-7.008±0.3	-5.701 0	-6.169 7	-6.745 9	-4.334 3
131	-39.28	-7.126±0.3	-5.265 0	-7.340 2	-8.085 2	-6.163 5
134	-44.55	-6.471±0.03	-6.239 1	-6.708 9	-6.811 4	-3.869 0
139	-44.25	-6.554±0.6	-2.465 2	-2.705 2	-2.402 0	-2.249 6
146	-68.72	-7.110±0.4	-3.484 5	-0.968 1	-1.708 0	-3.480 1
149	-36.34	-7.020±0.4	-4.333 5	-6.348 9	-5.901 8	-6.729 0

DOY	δ_E	δ_x (std)	δ_ET1	δ_ET2	δ_ET3	δ_ET4
97	-43.22	-6.621±0.8	-9.219 9	-6.714 9	-5.733 5	-8.104 9
100	-40.78	-7.124±0.1	-0.601 1	-7.507 4	-7.153 6	-0.918 2
115	-47.90	-7.080±0.06	-3.850 0	-9.197 2	-6.295 4	-8.726 8
120	-49.98	-7.008±0.3	-5.701 0	-6.169 7	-6.745 9	-4.334 3
131	-39.28	-7.126±0.3	-5.265 0	-7.340 2	-8.085 2	-6.163 5
134	-44.55	-6.471±0.03	-6.239 1	-6.708 9	-6.811 4	-3.869 0
139	-44.25	-6.554±0.6	-2.465 2	-2.705 2	-2.402 0	-2.249 6
146	-68.72	-7.110±0.4	-3.484 5	-0.968 1	-1.708 0	-3.480 1
149	-36.34	-7.020±0.4	-4.333 5	-6.348 9	-5.901 8	-6.729 0

DOY	δ_E	δ_x	δ_ET(11:30-14:30)	F_T(﹪)
97	-43.22	-6.621	-6.714 9	99.74
100	-40.78	-7.124	-7.507 4	98.86
115	-47.90	-7.080	-9.197 2	94.81
131	-39.28	-7.126	-7.340 2	99.33
134	-44.55	-6.471	-6.708 9	99.37

Partitioning wheat field evapotranspiration using Keeling Plot method and continuous atmospheric vapor δ¹⁸O data

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