干旱区人工枣林蒸散及植株蒸腾的模型模拟

doi:10.11707/j.1001-7488.20220706

Abstract

Abstract:

Objective: Ziziphus jujuba is a tree species with both ecological and economic benefits and has been successfully introduced to Xinjiang, China over the last two decades. Management of forest water consumption in arid zones requires estimations of evapotranspiration, which this study aimed to address through the use of the SIMDual-Kc model. Method: The model was parameterized and its applicability to dryland plantation economic forests was verified through measures of evapotranspiration and plant transpiration rate by two-year eddy covariance and a pin-stem flow meter, respectively. Evapotranspiration and plant transpiration were simulated under different irrigation frequencies, preset according to the 2-year measured data. Result: The SIMDual_Kc model was able to provide estimates of evapotranspiration and plant transpiration during the reproductive period that showed good consistency with measured data. When compared against measured data, the model simulations of evapotranspiration obtained determination coefficient (R²), index of agreement (d), Nash Sutcliffe Efficiency (NSE), and Standard Deviation Ratio (RSR) goodness-of-fit values of 0.57-0.60, 0.86-0.87, 0.51-0.55, and 0.67-0.70, respectively, whereas those of simulated plant transpiration were 0.73-0.77, 0.91-0.92, 0.62-0.64, and 0.60-0.61, respectively. The parameters of the SIMDual-Kc model were: Basalt crop coefficient K_{cb ini} = 0.18, K_{cb mid} = 0.7, K_{cb end} = 0.7, Depth of evaporation layer Z_e = 0.15 m, Total evaporation water TEW = 18 mm, Readily evaporable water REW = 19 mm, and Soil water consumption ratio P = 0.5. Model scenario analysis showed that under a constant total irrigation depth, different irrigation frequencies had greater and smaller effects on soil evaporation and plant transpiration, respectively and soil evapotranspiration increased with increasing irrigation frequency, indicating that soil surface water content had a greater effect on soil evapotranspiration. Conclusion: The SIMDual-Kc model provided accurate estimates of evapotranspiration and plant transpiration of planted Jujube forests in arid zones. The result of this study can provide a theoretical basis for formulating reasonable drip irrigation systems, irrigation decisions, and for agricultural water conservation in arid zones.

Key words: arid zones, planted Jujube forests, evapotranspiration, plant transpiration, SIMDual-Kc model, prediction

CLC Number:

S718.5

Ying Qiao, Yingjie Ma, Mingliang Xin. Model Simulation of Evapotranspiration and Plant Transpiration in Planted Jujube Forests in Arid Zones[J]. Scientia Silvae Sinicae, 2022, 58(7): 51-62.

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References 0

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土层 Soil layer/cm	土壤密度 Soil depth>90 cm density/(g·cm^-3)	田间持水量 Field moisture capacity(%)	土壤分类 Soil classification
0~50	1.59	8.35	砂土Sond
50~90	1.65	9.94	壤质砂土Ioamy sand
90以下Soil depth>90 cm	1.66	8.51	砂土Sund

年份 Year	日期 Date	灌水量 Irrigation amount/mm	灌溉次数 Irrigation times	施肥量 Fertilizer amount/(kg·hm^-2)	施肥次数 Fertilizer times
2018	04-12—04-30	32.71	1	37	1
	05-01—05-31	120.96	5	111	2
	06-1—06-30	206.94	6	111	3
	07-1—07-31	178.73	7	111	3
	08-1—08-31	162.90	6	111	3
	09-1—09-30	112.24	5	0	0
	10-1—10-20	0.00	0	0	0
2019	04-14—04-30	54.38	2	37	1
	05-1—05-31	130.50	4	74	2
	06-1—06-30	130.50	6	111	3
	07-1—07-31	170.38	6	111	3
	08-1—08-31	192.13	6	111	3
	09-1—09-30	134.13	5	0	0
	10-1—10-20	0.00	0	0	0

年份Year	生长初期Initial stage	快速生长期Development stage	生长中期Mid-season stage	生长后期End-season stage
2018	04-12—04-25	4.26~7.11	7.12~9.10	9.11~10.20
2019	04-14—04-23	4.24~7.10	7.11~9.10	9.11~10.20

参数Parameter	生育期Growth period	初始值Initial values	率定值Calibration value
蒸发层深度 Depth of evaporation layer(Z_e)/mm	—	15.00	15.00
总蒸发水量 Total evaporation water(TEW)/mm	—	13.00	18.00
易蒸发水量 Readily evaporable water(REW)/mm	—	7.00	9.00
基础作物系数 Basalt crop coefficient(K_cb)	初期Initial stage	0.30	0.18
	中期Mid-season	0.90	0.70
	后期End-season	0.50	0.70
土壤水分消耗比率 Soil water consumption ratio(p)	初期Initial stage	0.50	0.50
	中期Mid-season	0.50	0.50
	后期End-season	0.50	0.50

预测方案 Prediction program	灌水始末日期 Start and end date of irrigation	间隔天数 Number of days interval	灌溉次数 Irrigation times	灌水量 Amount of irrigation/mm	总灌水量 Total irrigation volume/mm	模拟值Simulated values
预测方案 Prediction program	灌水始末日期 Start and end date of irrigation	间隔天数 Number of days interval	灌溉次数 Irrigation times	灌水量 Amount of irrigation/mm	总灌水量 Total irrigation volume/mm	蒸散量 Evapotranspiration/mm	植株蒸腾量 Plant transpiration/mm	土壤蒸发量 Soil evaporation/mm
2018A	04-12—09-25	1	84	9.70	814.80	689.12	450.11	239.00
2018B	04-12—09-24	2	56	14.50	812.00	683.75	449.27	234.48
2018C	04-12—09-23	3	42	19.30	810.60	653.26	448.39	204.87
2018D	04-12—09-24	4	34	23.90	812.60	626.25	449.25	177.00
2019A	04-14—09-27	1	84	9.70	814.80	681.70	443.05	238.65
2019B	04-14—09-26	2	56	14.50	812.00	677.03	442.93	234.10
2019C	04-14—09-25	3	42	19.30	810.60	642.11	442.70	199.41
2019D	04-14—09-26	4	34	23.90	812.60	620.16	442.92	177.24

Model Simulation of Evapotranspiration and Plant Transpiration in Planted Jujube Forests in Arid Zones

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评价指标Evaluation index	蒸散量Evapotranspiration		植株蒸腾量Plant transpiration
评价指标Evaluation index	2018	2019	2018	2019
数据个数Number of data	192	190	192	160
均方根误差Root mean square error/(mm·d^-1)	0.95	0.94	0.57	0.58
平均绝对误差Mean absolute error/(mm·d^-1)	0.74	0.76	0.43	0.48
决定系数Determination coefficient	0.57	0.60	0.77	0.73
模型一致性指数Index of agreement	0.86	0.87	0.92	0.91
模型效率纳什系数Nash-Sutcliffe efficiency	0.55	0.51	0.64	0.62

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