紫色土坡耕地耕层质量障碍特征

doi:10.3864/j.issn.0578-1752.2020.07.009

Abstract

Abstract: 【Objective】 The purple soil slope farmland is characterized by high productivity and strong erodibility, and is an important cultivated land resource in the upper reaches of the Yangtze River. Analyzing the types of barrier tillage layer of slope farmland and its impact on crop yield has important application value for determining reasonable tillage layer construction parameters, controlling tillage layer quality and sustainable utilization of slope farmland. Based on the sample of cultivated layer of purple soil slope farmland in different soil fertility grades, this paper quantitatively analyzed the quality barrier characteristics of slope farmland.【Method】 In this paper, the obstacle degree model and cluster analysis were used to study the types and quality characteristics of barrier tillage layer in purple soil slope farmland of different soil fertility grades.【Result】 The results showed that: (1) There were significant differences in soil physical properties between purple soil slope farmland with different soil fertility grades. With the decrease of soil fertility grade, the slope of the plot was significantly larger, and the thickness of the effective soil layer of plot was significantly smaller. When the slope of the plot changed from 5.1° to 21.7°, the crop yield could be reduced by 45%. The lack of soil layer in the five-slope farmland was serious. However, the soil fertility attributes did not show significant differences. The soil organic matter, soil total nitrogen and cation exchange capacity of the first to fourth grade slope farmland in the same soil fertility grade were as follows: topsoil layer>subsoil layer>bottom soil layer. There was no significant difference between the topsoil layer and the subsoil layer in the fifth grade slope farmland. (2) The soil quality index of each soil layer in the first and second grade slope farmland was between 0.434 and 0.528. The soil quality index of each soil layer of the same soil productivity grade was characterized by topsoil layer>subsoil layer>bottom soil layer; the soil physical properties had a more significant effect on the soil quality of low-yield slope farmland. The obstacle degree of the slope of the plot of the fifth-grade slope farmland was 80.73 times than that of the first-grade slope farmland. (3) The purple soil slope farmland could be classified into three types, namely, III soil nutrient limited type, IV effective soil layer thickness limited type, and V field surface slope limited type. When the soil physical property was the main obstacle feature, the cultivated layer structure was loose, the subsoil layer was seriously deficient, and the crop yield was 25% lower than that of the soil nutrient-restricted sloping farmland. 【Conclusion】 The quality of the cultivated layer in the purple soil slope farmland was low, and the barrier cultivated layer included three types: soil nutrient limitation type, effective soil layer thickness limitation type, and slope of the plot limitation type. The physical properties of soil were the main limiting factors for the quality of the cultivated layer of purple soil slope farmland. The slope of the field was too large, and the thickness of the effective soil layer was shallow and thin.

Key words: purple soil, slope farmland, cultivated layer quality, barrier cultivated layer, obstacle degree model, cluster analysis

Ge SONG,DongMei SHI,XiaoYing ZENG,GuangYi JIANG,Na JIANG,Qing YE. Quality Barrier Characteristics of Cultivated Layer for Sloping Farmland in Purple Hilly Region[J].Scientia Agricultura Sinica, 2020, 53(7): 1397-1410.

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Figures/Tables 8

Table 1

Soil property index and crop yield of cultivated layer in purple soil slope farmland"

地块号 Block number	行政区域 Administrative region	土壤紧实度 Soil compaction	耕层厚度 Topsoil thickness (cm)	心土层厚度 Subsoil layer thickness (cm)	有效土层厚度Effective thickness of soil layer (cm)	田面坡度 Slope (°)	土壤有机质 Soil organic matter (g·kg^-1)	阳离子交换量 Cation exchange capacity ( cmol(+)·L^-1)	土壤全氮 Soil total nitrogen (g·kg^-1)	土壤有效磷 Soil effective phosphate (mg·kg^-1)	农作物产量 Crop yield (t·hm^-2)	地力等级 Productivity grade of cultivated land
1	万州区 Wanzhou District	疏松 Loose	20	20	40	5	19.5	32.1	1.0	12	9.00	一级 First grade
2	万州区 Wanzhou District	疏松 Loose	22	23	45	5	10.0	27.6	0.7	10	6.75	二级 Secondary grade
3	万州区 Wanzhou District	疏松 Loose	20	30	50	10	9.7	16.3	0.9	3	5.25	三级 Third grade
4	万州区 Wanzhou District	疏松 Loose	15	5	20	15	7.0	19.9	0.4	10	4.50	四级 Fourth grade
5	万州区 Wanzhou District	疏松 Loose	20	0	20	25	9.9	18.9	0.8	3	4.50	五级 Fifth grade
6	云阳县 Yunyang Country	疏松 Loose	25	15	40	6	14.6	31.8	0.9	9	9.75	一级 First grade
7	云阳县 Yunyang Country	疏松 Loose	25	25	50	7	9.0	21.1	0.6	7	9.25	二级 Secondary grade
8	云阳县 Yunyang Country	较紧实 Relatively compact	24	16	40	12	19.9	22.4	1.4	6	8.00	三级 Third grade
9	云阳县 Yunyang Country	疏松 Loose	20	20	40	16	12.3	24.8	0.7	4	6.50	四级 Fourth grade
10	云阳县 Yunyang Country	松散 Unconsolidated	20	0	20	20	5.3	28.4	0.4	4	5.25	五级 Fifth grade
11	北碚区 Beibei District	疏松 Loose	20	15	35	5	12.4	28.4	0.9	18	9.00	一级 First grade
12	北碚区 Beibei District	疏松 Loose	19	21	40	5	12.9	24.7	1.0	6	7.88	二级 Secondary grade
13	北碚区 Beibei District	疏松 Loose	20	10	30	10	16.6	17.4	1.1	45	7.13	三级 Third grade
14	北碚区 Beibei District	疏松 Loose	25	0	25	15	10.0	20.8	0.6	1	6.38	四级 Fourth grade
15	北碚区 Beibei District	疏松 Loose	15	0	15	25	10.6	28.8	0.7	6	5.63	五级 Fifth grade
16	綦江区 Qijiang District	疏松 Loose	20	20	40	5	12.2	12.9	0.8	29	9.30	一级 First grade
17	綦江区 Qijiang District	较疏松 Relatively loose	20	20	40	12	14.4	22.6	1.3	6	6.00	二级 Secondary grade
18	綦江区 Qijiang District	疏松 Loose	20	15	35	10	16.9	18.3	1.1	104	5.25	三级 Third grade
19	綦江区 Qijiang District	疏松 Loose	25	15	40	11.5	16.8	12.7	0.6	19	4.50	四级 Fourth grade
20	綦江区 Qijiang District	疏松 Loose	20	0	20	25	18.7	0.1	1.0	139	4.12	五级 Fifth grade
21	江津区 Jiangjin District	疏松 Loose	15	15	30	5	14.0	28.6	1.2	2	6.38	一级 First grade
22	江津区 Jiangjin District	疏松 Loose	19	21	40	5	12.9	21.5	1.0	6	6.00	二级 Secondary grade
23	江津区 Jiangjin District	疏松 Loose	20	20	40	10	10.5	15.8	0.8	1	5.25	三级 Third grade
24	江津区 Jiangjin District	疏松 Loose	20	10	30	15	21.1	16.6	1.1	14	4.50	四级 Fourth grade
25	江津区 Jiangjin District	疏松 Loose	20	10	30	15	16.3	14.1	1.2	0	4.13	五级 Fifth grade
26	彭水县 Pengshui County	疏松 Loose	20	25	45	5	19.6	11.5	1.3	4	9.75	一级 First grade
27	彭水县 Pengshui County	疏松 Loose	20	20	40	7	15.6	12.2	1.0	27	9.10	二级 Secondary grade
28	彭水县 Pengshui County	疏松 Loose	20	10	30	14	14.0	16.5	1.1	8	7.75	三级 Third grade
29	彭水县 Pengshui County	疏松 Loose	20	0	20	16	9.6	25.4	1.2	9	6.00	四级 Fourth grade
30	彭水县 Pengshui County	较紧实 Relatively compact	20	0	20	22	23.4	10.4	1.5	4	5.55	五级 Fifth grade
31	巴南区 Banan District	较疏松 Relatively loose	20	10	30	5	22.8	13.0	1.3	51	9.75	一级 First grade
32	巴南区 Banan District	较疏松 Relatively loose	20	20	40	7	15.5	25.8	1.0	8	8.10	二级 Secondary grade
33	巴南区 Banan District	疏松 Loose	15	10	25	14	32.3	12.7	1.5	27	5.50	三级 Third grade
34	巴南区 Banan District	疏松 Loose	20	0	20	17	14.8	-	1.0	14	6.00	四级 Fourth grade
35	巴南区 Banan District	疏松 Loose	20	0	20	17	12.6	17.3	0.8	18	5.55	五级 Fifth grade

Table 1

Fig. 1

Fig. 2

Table 2

Fig. 3

Table 3

Fig. 4

Fig. 5

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指标 Index	土壤属性指标对作物产量的作用 Effect of soil attribute index for crop yield	隶属函数 Membership function	土层 Soil layer	隶属函数参数 Membership function parameter		权重 Weight
指标 Index		隶属函数 Membership function	土层 Soil layer	a （下限Lower limit）	b （上限Up limit）	权重 Weight
土壤有机质 Soil organic matter (g·kg^-1)	+		耕作层 Topsoil layer	5.29	32.30	0.186
			心土层 Subsoil layer	5.07	21.40	0.217
			底土层 Bottom soil	3.57	16.60	0.155
土壤全氮 Soil total nitrogen (g·kg^-1)	+		耕作层 Topsoil layer	0.41	1.54	0.184
			心土层 Subsoil layer	0.35	1.08	0.183
			底土层 Bottom soil	0.27	2.13	0.252
土壤有效磷 Soil available phosphorus (mg·kg^-1)	+		耕作层 Topsoil layer	1.20	139.00	0.128
			心土层 Subsoil layer	0.09	22.00	0.137
			底土层 Bottom soil	0.19	123.00	0.208
阳离子交换量 Cation exchange capacity (cmol(+)·L^-1)	+		耕作层 Topsoil layer	0.08	32.10	0.155
			心土层 Subsoil layer	5.38	38.70	0.140
			底土层 Bottom soil	0.11	25.40	0.182
耕作层厚度 Topsoil layer thickness (cm)	+		耕作层 Topsoil layer	15.00	25.00	0.188
			心土层 Subsoil layer	-	-	-
			底土层 Bottom soil	-	-	-
心土层厚度 Subsoil layer thickness (cm)	+		耕作层 Topsoil layer	-	-	-
			心土层 Subsoil layer	5.00	30.00	0.130
			底土层 Bottom soil	-	-	-
田面坡度 Field surface slope (°)	-		耕作层 Topsoil layer	5.00	25.00	0.158
			心土层 Subsoil layer	5.00	16.00	0.193
			底土层 Bottom soil	5.00	25.00	0.203

地力等级 Productivity grade of cultivated land	土层 Soil layer	土壤属性指标障碍度 Barrier degree of soil property index (%)
地力等级 Productivity grade of cultivated land	土层 Soil layer	土壤有机质 Soil organic matter	土壤全氮 Soil total nitrogen	土壤有效磷 Soil available phosphorus	阳离子交换量 Cation exchange capacity	土层厚度 Soil thickness	田面坡度 Field surface slope
一级 First	耕作层 Topsoil layer	22.32	16.42	23.10	9.41	19.16	0.19
	心土层 Subsoil layer	29.41	19.21	21.11	15.69	14.15	0.43
	底土层 Bottom soil	17.82	30.82	37.53	13.56	-	0.27
二级 Secondary	耕作层 Topsoil layer	24.71	18.22	22.26	8.87	14.86	2.22
	心土层 Subsoil layer	31.66	17.54	20.75	14.96	9.48	5.61
	底土层 Bottom soil	19.92	37.09	35.55	4.11	-	3.33
三级 Third	耕作层 Topsoil layer	18.69	12.28	18.59	13.05	17.24	7.10
	心土层 Subsoil layer	24.18	14.52	17.21	16.79	12.48	14.81
	底土层 Bottom soil	15.45	31.50	31.75	11.45	-	9.84
四级 Fourth	耕作层 Topsoil layer	20.09	17.71	18.26	11.00	12.20	9.74
	心土层 Subsoil layer	20.28	14.85	13.69	12.91	17.51	20.77
	底土层 Bottom soil	15.49	31.89	30.38	7.17	-	15.07
五级 Fifth	耕作层 Topsoil layer	18.21	14.56	15.26	10.59	15.33	15.46
	心土层 Subsoil layer	-	-	-	-	-	-
	底土层 Bottom soil	3.06	28.28	17.65	21.99	-	29.02

Quality Barrier Characteristics of Cultivated Layer for Sloping Farmland in Purple Hilly Region

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