Estimating whole-tree water use of Picea crassifolia based on heat ratio method

doi:10.17521/cjpe.2017.0082

Abstract

Abstract:

Aims Accurate estimation of forest transpiration in the upper reach of the watershed is vital to the management of water resources in arid region. The objective of this study was to provide a systematic method for calculating the forest evapotranspiration at different scales.

Methods In this study we measured the whole-tree transpiration using the heat ratio method technology and estimated the stand- and catchment-transpiration employing the upscaling methods.

Important findings The main results and conclusions were as follows: First, the diameter at breast height (DBH) exhibited significant correlations with sapwood area, and the correlation was characterized by the exponential function (R²=0.94,p＜0.001).Second, in the weighted calculation of sap-flux measurements based on two-point thermocouples and sapwood area of Picea crassifolia，the correction coefficient between the true value and the observation value was 1.09. Third, when calculating sap-fluxes based on the average-sap-flux and total sapwood area of stand-transpiration, ignoring sap-flux velocity heterogeneities of trees led to transpiration rates being overestimated or underestimated by nearly one third; Fourth, the stand-transpiration estimation method based on the relationship between DBH and sap-flux can give a more reasonable prediction ofPicea crassifolia transpiration. The results indicated that the probe-based sap-flux measuring technology would perform well for the transpiration scaling-up calculation at the catchment with only one single tree species, and the calculation methodology can be applied to other watersheds.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201802006

Key words: transpiration, upscaling, heat ratio method, Picea crassifolia

YANG Jun-Jun, FENG Jian-Min, HE Zhi-Bin. Estimating whole-tree water use of Picea crassifolia based on heat ratio method[J]. Chin J Plant Ecol, 2018, 42(2): 195-201.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2017.0082

https://www.plant-ecology.com/EN/Y2018/V42/I2/195

Figures/Tables 6

References 22

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样树编号 Sample tree number	树高 Tree height	胸径 Diameter at breast height	冠幅宽度 Crown width	冠幅投影面积 Crown projection area	树皮厚度 Bark depth	心材半径 Heartwood radius	边材厚度 Sapwood width	边材面积 Sapwood area
样树编号 Sample tree number	(m)	(cm)	(m)	(m²)	(cm)	(mm)	(mm)	(mm²)
1	16.1	22.2	4.24	14.07	0.6	67	37.5	20β327.0
2	14.2	16.0	4.29	14.16	0.6	42	32.1	11β694.6
3	13.0	15.5	3.38	10.35	0.6	40	31.7	11β090.7
4	11.3	11.4	2.68	8.13	0.6	22	28.6	6β599.9
5	5.5	6.2	2.01	6.34	0.3	8	20.5	2β286.3
6	5.3	5.0	1.60	5.50	0.3	8	14.5	1β343.8
7	4.2	5.1	2.26	6.91	0.3	8	15.0	1β413.7
8	3.8	4.1	2.11	6.55	0.3	8	10.0	785.4

样树编号 Sample tree number	树高 Tree height	胸径 Diameter at breast height	冠幅宽度 Crown width	冠幅投影面积 Crown projection area	树皮厚度 Bark depth	心材半径 Heartwood radius	边材厚度 Sapwood width	边材面积 Sapwood area
样树编号 Sample tree number	(m)	(cm)	(m)	(m²)	(cm)	(mm)	(mm)	(mm²)
1	16.1	22.2	4.24	14.07	0.6	67	37.5	20β327.0
2	14.2	16.0	4.29	14.16	0.6	42	32.1	11β694.6
3	13.0	15.5	3.38	10.35	0.6	40	31.7	11β090.7
4	11.3	11.4	2.68	8.13	0.6	22	28.6	6β599.9
5	5.5	6.2	2.01	6.34	0.3	8	20.5	2β286.3
6	5.3	5.0	1.60	5.50	0.3	8	14.5	1β343.8
7	4.2	5.1	2.26	6.91	0.3	8	15.0	1β413.7
8	3.8	4.1	2.11	6.55	0.3	8	10.0	785.4

月份 Month	样树编号 Sample tree number
月份 Month	1	3	4	5	6	7	8
7月 July	68.67 ± 6.49	29.97 ± 4.19	17.89 ± 2.24	5.37 ± 0.33	7.54 ± 0.87	3.81 ± 0.43	2.78 ± 0.11
8月 August	44.55 ± 9.09	14.77 ± 4.41	9.74 ± 2.57	2.93 ± 0.89	4.36 ± 1.27	1.40 ± 0.53	1.81 ± 0.42
9月 September	34.83 ± 9.50	9.98 ± 3.29	6.88 ± 3.01	1.72 ± 0.72	2.56 ± 1.29	0.53 ± 0.09	0.97 ± 0.28
10月 October	25.81 ± 6.68	6.99 ± 1.43	3.16 ± 1.20	0.95 ± 0.31	1.64 ± 0.68	0.41 ± 0.03	0.79 ± 0.18

月份 Month	样树编号 Sample tree number
月份 Month	1	3	4	5	6	7	8
7月 July	68.67 ± 6.49	29.97 ± 4.19	17.89 ± 2.24	5.37 ± 0.33	7.54 ± 0.87	3.81 ± 0.43	2.78 ± 0.11
8月 August	44.55 ± 9.09	14.77 ± 4.41	9.74 ± 2.57	2.93 ± 0.89	4.36 ± 1.27	1.40 ± 0.53	1.81 ± 0.42
9月 September	34.83 ± 9.50	9.98 ± 3.29	6.88 ± 3.01	1.72 ± 0.72	2.56 ± 1.29	0.53 ± 0.09	0.97 ± 0.28
10月 October	25.81 ± 6.68	6.99 ± 1.43	3.16 ± 1.20	0.95 ± 0.31	1.64 ± 0.68	0.41 ± 0.03	0.79 ± 0.18