Soil Moisture Differences of Automatic and Artificial Observation: Comparative Analysis

doi:10.11924/j.issn.1000-6850.casb18110101

Abstract

Abstract:

Based on the soil moisture data of the parallel observation of DNZ2 and artificial drying method measured by Haibei Pastoral Test Station in Qinghai from July 28, 2017 to September 18, 2018, by comparing the differences, and calculating the probability of the differences and other relevant statistical methods, we analyzed the soil weight moisture capacity of 10-50 cm by layer. The results showed that: the data obtained by Haibei Pastoral Test Station were consistent with the data obtained by artificial observation during the study period; the soil weight moisture capacity observed by automatic station was lower than that by artificial observation, and the difference between 30 cm and 50 cm was relatively small, while the difference between 10 cm and 20 cm was relatively large; the data revision of the soil weight moisture capacity was conducted based on the data of automatic station and artificial observation, the results showed that all absolute errors were less than 3%, indicating that the soil moisture data by automatic observation in Haibei Pastoral Test Station could basically replace that by artificial observation. The study could provide certain technical support for promoting the automatic monitoring of agricultural meteorology.

Key words: automatic, artificial, replace, soil weight moisture capacity, difference, Qinghai

CLC Number:

S152.7

Zhao Mengfan, Yan Liangdong. Soil Moisture Differences of Automatic and Artificial Observation: Comparative Analysis[J]. Chinese Agricultural Science Bulletin, 2020, 36(7): 90-98.

Figures/Tables 11

References 21

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	10 cm	20 cm	30 cm	40 cm	50 cm
平均差值	-5.24	-2.74	-1.56	-0.82	0.47
最大正差值	2.69	11.26	8.45	3.28	3.61
最小正差值	0.51	0.08	0.12	0.24	0.08
正差值占比	9.62	20.41	34.69	33.33	68.75
最大负差值	-11.45	-8.27	-8.04	-7.44	-8.68
最小负差值	-0.63	-0.35	-0.08	-0.12	-0.31
负差值占比	90.38	79.59	65.31	66.67	31.25

	10 cm	20 cm	30 cm	40 cm	50 cm
平均差值	-5.24	-2.74	-1.56	-0.82	0.47
最大正差值	2.69	11.26	8.45	3.28	3.61
最小正差值	0.51	0.08	0.12	0.24	0.08
正差值占比	9.62	20.41	34.69	33.33	68.75
最大负差值	-11.45	-8.27	-8.04	-7.44	-8.68
最小负差值	-0.63	-0.35	-0.08	-0.12	-0.31
负差值占比	90.38	79.59	65.31	66.67	31.25

土层深度	0%~1.5%	1.5%~3%	3%~4.5%	4.5%~6%	6%~7.5%	>7.5%	<3%	<4.5%	<6%	<7.5%
10 cm	17.31	9.62	25.00	7.69	11.54	28.85	26.92	51.92	59.62	71.15
20 cm	26.53	24.49	18.37	12.24	12.24	6.12	51.02	69.39	81.63	93.88
30 cm	40.82	20.41	24.49	10.20	0.00	4.08	61.22	85.71	95.92	95.92
40 cm	62.50	20.83	10.42	4.17	2.08	0.00	83.33	93.75	97.92	100.00
50 cm	35.42	43.75	16.67	2.08	0.00	2.08	79.17	95.83	97.92	97.92

土层深度	0%~1.5%	1.5%~3%	3%~4.5%	4.5%~6%	6%~7.5%	>7.5%	<3%	<4.5%	<6%	<7.5%
10 cm	17.31	9.62	25.00	7.69	11.54	28.85	26.92	51.92	59.62	71.15
20 cm	26.53	24.49	18.37	12.24	12.24	6.12	51.02	69.39	81.63	93.88
30 cm	40.82	20.41	24.49	10.20	0.00	4.08	61.22	85.71	95.92	95.92
40 cm	62.50	20.83	10.42	4.17	2.08	0.00	83.33	93.75	97.92	100.00
50 cm	35.42	43.75	16.67	2.08	0.00	2.08	79.17	95.83	97.92	97.92

土层深度/cm	RMSE/%	E/%	RE/%	相关系数
10	6.67	5	-16.52	0.91^**
20	5.25	3.44	-5.75	0.89^**
30	4.23	2.48	-2.65	0.90^**
40	3.64	1.7	-1.26	0.88^**
50	3.92	2.1	3.52	0.81^**