WEPS模型在乌兰布和沙漠油莎豆（Cyperus esculentus）种植区的应用

doi:10.13866/j.azr.2022.05.15

Abstract

Abstract:

The purpose of this study was to explore the wind erosion evaluation accuracy of the Wind Erosion Prediction System (WEPS). Wind erosion monitoring was carried out on the surface of four different harvest modes in the Ulan Buh Desert Cyperus esculentus planting area in Inner Mongolia, China as follows: full harvest, retain four harvest six, retain six harvest six, and retain intercrop (Cyperus esculentus and Haloxylon ammodendron). Wind erosion monitoring was carried out on the model surface, and the wind erosion prediction results of the WEPS model were verified using the wind erosion data, which was measured twice. The research results showed that compared with full harvesting, the three stubble modes effectively reduced the effect of wind erosion on the surface of the planting area. The intercropping stubble had the strongest wind-proof and sand-fixing ability among them, and the six remaining six harvested was the weakest. The surface wind-proof and sand-fixing ability was the weakest. With the increased number of remaining stubble, the structural characteristics of wind-sand flow gradually changed from a tortuous shape to the shape of “1”. This can provide a basis for the promotion of planting Cyperus esculentus in northern sandy areas to balance ecological and economic benefits. With the increased height, the sediment load of full harvest, with four remaining six harvested and six remaining six harvested, showed an exponential decreasing trend. The intercropping stubble sediment load showed a logarithmic decrease with the increase of height. The fitting degree decreased gradually, and the distribution law of sediment transport with height changed to a logarithmic direction. There was a certain difference between the WEPS prediction and the measured results. The maximum model value was 10.16 times the measured value, and the minimum was 0.58 times the measured value. The model prediction quality was uncertain, and the prediction effect was poor on the surface with high vegetation coverage. However, there was reasonable consistency as the unit-width sediment load predicted by the model increased as a power function with the increase of the measured value. Overall, the model is feasible in small-scale areas to predict the variation trend of wind erosion with different surface characteristics. However, in the quantitative prediction of wind erosion, the prediction value is less stable. It is necessary to strengthen the research on the model in multi-climate, multi-type surface vegetation coverage, multi-sequence prediction, and other factors related to wind erosion to establish a database that adjusts the model parameters and formulas according to the actual wind erosion environment to improve the universality of WEPS in the future.

Key words: Wind Erosion Prediction System, Cyperus esculentus, wind erosion, Ulan Buh desert

LIAO Guiyun,WU Xiuqin,TAN Jin,LI Dan,FENG Mengxin. Application of the Wind Erosion Prediction System in the Ulan Buh Desert Cyperus esculentus planting area[J].Arid Zone Research, 2022, 39(5): 1504-1513.

Figures/Tables 11

Fig. 1

Fig. 2

Tab. 1

Tab. 2

Fig. 3

Tab. 3

Fitting relationship between sediment transport and height in different harvesting modes"

日期/年-月-日	采收模式	拟合方程	R²	P
2020-11-15	全采收	$Q = 6.3343 e - 0.225 Z$	0.970	4.4E-3
	留4采6	$Q = 9.342 e - 0.378 Z$	0.947	6.2E-3
	留6采6	$Q = 0.5458 e - 0.137 Z$	0.923	4.6E-3
	间作留茬	$Q = 0.0567 - 0.017 l n Z$	0.920	7.8E-5
2020-12-26	全采收	$Q = 12.919 e - 0.252 Z$	0.978	1.4E-3
	留4采6	$Q = 1.1503 e - 0.21 Z$	0.948	2.2E-2
	留6采6	$Q = 0.876 e - 0.189 Z$	0.921	5.3E-3
	间作留茬	$Q = 0.1376 - 0.039 l n Z$	0.907	2.7E-5

Tab. 3

Tab. 4

Tab. 5

Tab. 6

Fig. 4

Fig. 5

References 29

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日期/年-月-日	采收模式	0.5 m处日平均风速/（m·s^-1）	1.0 m处日平均风速/（m·s^-1）	1.4 m处日平均风速/（m·s^-1）	起风时长/h	风向
2020-11-15	全采收	6.88	7.83	7.87	22	西偏北
2020-12-26	全采收	6.09	6.85	7.23	23	西偏北
2020-11-15	留4采6	6.78	7.29	8.00	22	西偏北
2020-12-26	留4采6	5.33	6.30	6.85	23	西偏北
2020-11-15	留6采6	6.37	7.03	7.12	22	西偏北
2020-12-26	留6采6	3.93	4.78	5.89	23	西偏北
2020-11-15	间作留茬	6.50	7.04	7.36	22	西偏北
2020-12-26	间作留茬	3.81	4.95	5.71	23	西偏北

采收模式	平均密度/（株·m^-2）	带宽/m	带间距/m	土壤容重/（g·cm^-3）	土壤含水率/%	<50 μm颗粒/%
全采收	0	0	0	1.64±0.02a	1.78±0.47c	25.72±0.52a
留4采6	52.00±3.00a	4.20±0.23a	5.50±0.16a	1.57±0.04a	2.34±0.28b	16.17±0.34c
留6采6	48.00±2.00b	5.50±0.35b	5.50±0.21a	1.51±0.01b	2.24±0.43b	24.71±0.41a
间作留茬	47.00±3.00b	0.70±0.06c	2.50±0.11b	1.60±0.02a	2.94±0.53a	19.59±0.46b

日期/年-月-日	全采收	留4采6	留6采6	间作留茬
2020-11-15	10.06±0.02a	2.55±0.05b	1.56±0.05c	0.13±0.01d
2020-12-26	10.43±0.10a	3.17±0.03b	1.58±0.04c	0.36±0.02d

日期/年-月-日	采收模式	10 m处风速 /（m·s^-1）	空气动力学粗糙度/m	叶面积指数	直立植株高度/m	植被盖度/%	结皮面积比/%	倒放植被覆盖面积/%
2020-11-15	全采收	11.40	0.004	0	0	0	0	0
2020-12-26	全采收	9.40	0.002	0	0	0	0	0
2020-11-15	留4采6	11.40	0.032	0.844	0.196	18.003	1.561	0
2020-12-26	留4采6	9.40	0.013	0.624	0.154	15.323	2.177	0
2020-11-15	留6采6	11.40	0.062	0.672	0.153	28.832	1.728	0
2020-12-26	留6采6	9.40	0.047	0.432	0.132	24.126	1.328	0
2020-11-15	间作留茬	11.40	0.097	3.055	0.251	48.429	1.673	0
2020-12-26	间作留茬	9.40	0.062	1.974	0.218	45.362	1.824	0.12

日期/年-月-日	采收模式	摩阻风速/（m·s^-1）	有效植被拖曳系数	植被冠层空气动力学粗糙度/m	临界摩阻风速/（m·s^-1）
2020-11-15	全采收	0.673	0	0	0.370
2020-12-26	全采收	0.530	0	0	0.370
2020-11-15	留4采6	0.739	0.177	0.020	0.673
2020-12-26	留4采6	0.615	0.124	0.018	0.642
2020-11-15	留6采6	0.728	0.134	0.018	0.809
2020-12-26	留6采6	0.601	0.084	0.013	0.682
2020-11-15	间作留茬	0.734	0.611	0.021	0.884
2020-12-26	间作留茬	0.689	0.395	0.020	0.730

Application of the Wind Erosion Prediction System in the Ulan Buh Desert Cyperus esculentus planting area

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