基于机器学习方法的宁夏南部土壤质地空间分布研究

doi:10.3864/j.issn.0578-1752.2022.15.008

Abstract

Abstract:

【Objective】Based on historical soil data, this paper studied the spatial variability of soil texture and its relationship with environmental factors in southern Ningxia by using machine learning.【Method】Classification and regression tree (CART), random forest (RF) and traditional statistical methods were used to explore the main environmental factors that affected the soil texture types and predict the spatial distribution of soil texture types in southern Ningxia, based on 428 soil profiles from the second soil survey in the 1980s, combined with topographic factors, soil types, and normalized vegetation index. The accuracy of the models were verified by the validating set of soil profiles and the soil samples in Haiyuan County, Ningxia.【Result】(1)The accuracy rates of RF and CART on the soil texture type of the verification set of soil profiles were 62.36% and 55.29%, respectively; the area under the receiver operating characteristic (ROC) curve of them (area under roc curve, AUC) were 0.7515 and 0.6933, respectively; the accuracy rates of them on soil samples in Haiyuan County were 54.10% and 48.36%, respectively; the AUC of them were 0.6599 and 0.5981 respectively. (2) Soil type (ST) was the most important predictor variable, followed by elevation (Ele). The higher elevation was, the heavier the soil texture was. The effects of wind exposition index (WEI) and slope (Slo) on soil texture were lower. (3)The results predicted by two methods showed a spatial distribution trend that the soil texture was heavy in the southern area but light in the northern area of southern Ningxia.【Conclusion】The prediction accuracy of RF for soil texture type in southern Ningxia was higher than CART. Making full use of historical data, combined with field sampling, could meet the accuracy requirements of digital mapping. In the loess region, soil types and elevation were the environmental factors which had strong correlation with spatial variation of soil texture.

Key words: soil texture, spatial distribution, factor analysis, random forest (RF), classification and regression tree (CART)

SHEN Zhe,ZHANG RenLian,LONG HuaiYu,XU AiGuo. Research on Spatial Distribution of Soil Texture in Southern Ningxia Based on Machine Learning[J].Scientia Agricultura Sinica, 2022, 55(15): 2961-2972.

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土壤类型 Soil type	土壤质地类型 Soil texture type
土壤类型 Soil type	松砂、紧砂土 Sand	砂壤土 Sandy loam	轻壤土 Light loam	中壤土 Medium loam	重壤土 Heavy loam	合计 Total
风沙土 Aeolian sandy soil	10	1	0	0	0	11
灰钙土 Sierozem	6	55	69	15	4	149
黄绵土 Loessal soil	0	1	3	5	0	9
黑垆土 Dark loessal soil	0	14	51	48	7	120
灰褐土 Grey cinnamon	0	1	32	36	3	72
亚高山草甸土 Meadow soil	0	0	1	2	0	3
新积土 Alluvial soil	0	13	22	7	2	44
盐土 Saline soil	0	2	5	3	1	11
潮土 Fluvo-aquic soil	0	0	1	5	2	8
粗骨土 Fragmental soil	0	1	0	0	0	1
合计 Total	16	88	184	121	19	428

土壤质地类型 Soil texture	<0.01mm （%）	赋值 Assignment
松砂、紧砂土Sand	0-10	1
砂壤土Sandy loam	10-20	2
轻壤土Light loam	20-30	3
中壤土Medium loam	30-45	4
重壤土Heavy loam	45-60	5

项目 Item	土壤质地类型 Soil texture type
项目 Item	松砂、紧砂土 Sand	砂壤土 Sandy loam	轻壤土 Light loam	中壤土 Medium loam	重壤土 Heavy clay loam	合计 Total
验证样点 Validation sample	3	16	37	24	5	85
CART正确数 Right quantity (CART)	1	7	20	18	1	47
CART正确率 Right rate (CART) (%)	33.33	43.75	54.05	75.00	20.00	55.29
RF正确数 Right quantity (RF)	2	10	23	16	2	53
RF正确率 Right rate (RF) (%)	66.67	62.50	62.16	66.67	40.00	62.36

项目 Item	土壤质地类型 Soil texture type
项目 Item	松砂、紧砂土 Sand	砂壤土Sandy loam	轻壤土 Light loam	中壤土 Medium loam	重壤土 Heavy loam	合计 Total
实测样点	0	10	64	44	4	122
CART正确数 Right quantity (CART)	—	3	28	27	1	59
CART正确率 Right rate (CART) (%)	—	20.00	43.75	61.36	25.00	48.36
RF正确数 Right quantity (RF)	—	4	36	23	3	66
RF正确率 Right rate (RF) (%)	—	40.00	56.25	52.27	75.00	54.10

Research on Spatial Distribution of Soil Texture in Southern Ningxia Based on Machine Learning

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样本组 Sample group	松砂、紧砂土 Sand	砂壤土 Sandy loam	轻壤土 Light loam	中壤土 Medium loam	重壤土 Heavy loam	合计 Total
训练集 Calibration sample	13	72	147	97	14	343
验证集 Validation samples	3	16	37	24	5	85
合计Total	16	88	184	121	19	428

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方法 Method	宁夏南部验证集剖面点Validation samples in southern Ningxia	海原县实测点Samples in Haiyuan County
CART	0.6933	0.5981
RF	0.7515	0.6599