黄土高原长期覆膜苹果园土壤物理退化与细根生长响应

孙文泰, 马明

Response of soil physical degradation and fine root growth on long-term film mulching in apple orchards on Loess Plateau

SUN Wen-Tai, MA Ming

表2 甘肃陇东苹果园覆膜后垂直方向土壤物理性状变化(平均值±标准差)

Table 2 Changes of soil physical properties in vertical direction of film mulching apple orchard in Longdong, Gansu (mean ± SD)

指标 Indicator	土层 Soil layer ( cm)	CK	2Y	4Y	6Y
有机质含量 Organic matter content (g∙kg^-1)	0-20	12.94 ± 0.17^a	12.48 ± 0.12^a	11.70 ± 0.52^a	12.03 ± 0.31^a
有机质含量 Organic matter content (g∙kg^-1)	20-40	8.41 ± 0.25^b	8.00 ± 0.11^b	6.56 ± 0.20^b	6.38 ± 0.09^b
土壤含水量 Soil moisture (g∙cm^-3)	0-20	21.07 ± 1.30^b	23.68 ± 1.39^b	24.23 ± 1.93^a	19.13 ± 1.30^a
土壤含水量 Soil moisture (g∙cm^-3)	20-40	23.89 ± 2.00^a	28.20 ± 1.50^a	25.24 ± 1.46^a	19.88 ± 2.28^a
土壤孔隙度 Soil porosity (%)	0-20	54.48 ± 1.17^a	57.56 ± 1.36^a	51.01 ± 3.54^a	49.87 ± 0.37^a
土壤孔隙度 Soil porosity (%)	20-40	47.71 ± 1.33^b	49.87 ± 1.37^b	47.26 ± 3.52^ab	44.80 ± 2.00^b
土壤密度 Soil density (g∙cm^-3)	0-20	1.30 ± 0.07^ab	1.18 ± 0.07^ab	1.18 ± 0.04^b	1.24 ± 0.05^a
土壤密度 Soil density (g∙cm^-3)	20-40	1.27 ± 0.06^b	1.24 ± 0.02^a	1.26 ± 0.05^a	1.28 ± 0.01^a
土壤通气度 Soil aeration (%)	0-20	35.34 ± 1.60^a	34.20 ± 1.45^a	26.78 ± 1.80^a	28.80 ± 1.06^a
土壤通气度 Soil aeration (%)	20-40	27.83 ± 1.07^b	21.67 ± 1.07^b	22.02 ± 0.22^b	19.47 ± 1.07^b
毛管孔隙度 Capillary porosity (%)	0-20	42.65 ± 0.44^a	44.48 ± 0.74^a	42.14 ± 0.79^a	41.46 ± 0.95^a
毛管孔隙度 Capillary porosity (%)	20-40	36.09 ± 1.45^b	34.24 ± 1.06^b	34.96 ± 1.66^b	32.83 ± 0.37^b
黏粒含量 Clay content (%)	0-20	9.70 ± 0.03^a	9.61 ± 0.04^b	9.77 ± 0.03^b	9.93 ± 0.03^a
黏粒含量 Clay content (%)	20-40	9.59 ± 0.06^b	9.83 ± 0.07^ab	9.93 ± 0.09^ab	10.20 ± 0.35^a
粉粒含量 Silt content (%)	0-20	79.72 ± 0.53^b	77.16 ± 1.32^b	79.20 ± 1.00^a	79.15 ± 1.19^b
粉粒含量 Silt content (%)	20-40	82.27 ± 1.76^a	83.42 ± 0.59^a	81.87 ± 1.28^a	83.95 ± 1.69^a
砂粒含量 Sand content (%)	0-20	10.58 ± 0.14^a	13.23 ± 0.13^a	11.03 ± 0.08^a	10.92 ± 0.12^a
砂粒含量 Sand content (%)	20-40	8.14 ± 0.05^b	6.75 ± 0.02^b	8.20 ± 0.10^b	5.85 ± 0.05^b
物理性黏粒 Physical clay particles (%)	0-20	56.75 ± 0.12^a	52.25 ± 0.24^b	54.49 ± 0.17^b	57.41 ± 0.15^b
物理性黏粒 Physical clay particles (%)	20-40	57.89 ± 0.37^a	60.42 ± 0.17^a	62.98 ± 1.10^a	65.57 ± 1.15^a
PD (g∙cm^-3)	0-20	2.18 ± 0.08^a	2.05 ± 0.08^b	2.06 ± 0.04^b	2.13 ± 0.03^b
PD (g∙cm^-3)	20-40	2.14 ± 0.04^ab	2.12 ± 0.02^ab	2.16 ± 0.03^ab	2.20 ± 0.02^a
CL	0-20	0.24 ± 0.01^a	0.02 ± 0.00^b	0.09 ± 0.01^b	0.31 ± 0.02^b
CL	20-40	0.18 ± 0.01^b	0.05 ± 0.00^a	0.44 ± 0.01^a	0.51 ± 0.02^a