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4 甘肃陇东苹果园覆膜后亚表层土壤物理性状与细根生长相关性

Table 4 Correlation between physical properties of subsurface soil and fine root growth after film mulching in apple orchard of Longdong, Gansu

指标 Indicator	根长 Root length (cm)	根表面积 Root surface area (cm²)	平均根径 Average root diameter (mm)	比根长 Specific root length (cm·g^-1)	分支数 Branch number (NO.∙cm^-1)	导管直径 Vessel diameter (μm)	导管密度 Catheter density (NO.·mm^-2)
有机质含量 Organic matter content (g∙kg^-1)	0.312	0.552^*	-0.567^*	0.656^**	-0.687^**	0.400	-0.665^**
土壤含水量 Soil moisture (g∙cm^-3)	0.033	0.339	-0.400	0.465	-0.821^**	0.379	-0.687^**
土壤孔隙度 Soil porosity (%)	0.617^**	0.791^**	-0.690^**	0.479	-0.508^*	0.429	-0.541^*
土壤密度 Soil density (g∙cm^-3)	-0.611^**	-0.147	-0.230	0.319	0.622^**	-0.677^**	0.751^**
土壤通气度 Soil aeration (%)	0.723^**	0.709^**	-0.736^**	0.645^**	0.088	-0.152	-0.561^*
毛管孔隙度 Capillary porosity (%)	0.747^**	0.773^**	-0.589^**	0.543^*	-0.527^*	0.603^**	-0.579^*
黏粒含量 Clay content (%)	-0.568^**	-0.553^**	0.636^**	-0.595^*	0.607^**	-0.289	0.710^**
物理性黏粒含量 Physical clay particles content (%)	-0.964^**	-0.954^**	0.906^**	-0.817^**	0.612^**	-0.835^**	0.774^**
土壤压实度 Packing density of soil (g·cm^-3)	-0.557^*	-0.697^**	0.717^**	-0.811^**	0.607^**	-0.623^**	0.719^**
土壤板结系数 Limit of soil compaction	-0.858^**	-0.932^**	0.900^**	-0.797^**	0.622^**	-0.218	-0.397
团聚体破坏率 Aggregates processing damage rate (%)	-0.621^**	-0.651^**	0.046	-0.321	0.966^**	-0.790^**	0.734^**
水稳系数 Water stability coefficient (%)	0.459	0.586^*	0.172	0.333	-0.956^**	0.834^**	-0.818^**
水稳性团聚体平均质量直径 Mean weight diameter of water-stable aggregates (mm)	0.231	0.798^**	-0.127	-0.268	-0.853^**	0.430	-0.537^*
水稳性团聚体平均几何直径 Geometric mean diameter of water-stable aggregates (mm)	0.701^**	0.393	-0.233	0.417	-0.928^**	0.845^**	-0.634^**