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5 甘肃陇东苹果园覆膜后亚表层根系与土壤各性状主成分分析

Table 5 Principal component analysis of subsurface root and soil characters after film mulching in apple orchard of Longdong, Gansu

指标 Indicator	主成分 Principal component	方差贡献率 Variance contribution rate (%)	累计贡献率 Cumulative contribution rate (%)	载荷矩阵 Load matrix	综合得分 Composite scores		综合排名 Comprehensive ranking
根系 Root	1	63.66	63.66	根长、分支数 Root length, Branch number	CK	0.98	1
	1	63.66	63.66	根长、分支数 Root length, Branch number	2Y	0.24	2
	2	25.49	89.15	导管直径、导管密度 Vessel diameter, Catheter density	4Y	-0.50	3
	2	25.49	89.15	导管直径、导管密度 Vessel diameter, Catheter density	6Y	-0.72	4
土壤 Soil	1	59.98	59.98	物理性黏粒含量、水稳性团聚体平均几何直径、有机质含量、水稳系数、团聚体破坏率 Physical clay particles content, Geometric mean diameter of water-stable aggregates, Organic matter content, Water stability coefficient, Aggregates processing damage rate	CK	0.10	2
	1	59.98	59.98		2Y	0.93	1
	2	26.37	86.34	土壤密度、土壤压实度 Soil density, Packing density of soil	4Y	-0.12	3
	2	26.37	86.34	土壤密度、土壤压实度 Soil density, Packing density of soil	6Y	-0.91	4