Root Structure Characteristics And Spatial Heterogeneity Of Different-plant-age Of Amorpha

With the increase of soil depth, the plant age amorpha root biomass, root volume, root surface area showed Index Y=ae-bx form decremented. By weakening factor analysis concentrated on the roots close to the surface of the soil, root distribution among the parameters of the performance of different degrees of correlation:soil moisture (SM) and aboveground biomass (AGB), root biomass (RB), specific root length (SRL) was significant correlation between the level of the root surface area (RSA) were positively correlated.1. As soil depth increased, all aged amorpha fruticosa root biomass, root volume, root surface area declined following index Y=ae-bx form. Weakening factor analysis showed that root concentrated close to the surface soil. Soil moisture (SM) showed significant positive correlation with aboveground biomass (AGB), root biomass (RB) and specific root length (SRL).2. Amorpha adjusted root morphology to change root distribution in different soil nutrients plaques, and thus gain more resources; spatial variability of soil moisture was significantly positively correlated to root surface area, root ratio, root biomass, and root volume,and was significantly correlated with root length;organic carbon was negatively correlated with total length of roots,and positively correlated with root diameter; nitrate was significantly positively correlated with root biomass; total phosphorus positively correlated with specific root length, and was negatively correlated with root diameter, available phosphorus was positively correlated with root diameter.3. With the increasing planting years,Amorpha did not show phenomenon of recession. By changing the ratio of root, root elongation, increasing absorption area of root, Amorpha root has the ability to self-thinning and meet the need of water and nutrients for growth, long-term adaptation to climate fluctuations, high temperatures and arid desert environment. Aboveground morphology reflected the distribution of roots to some extent.4. Soil moisture spatial variability is moderate variability,60age35age28age amorpha roots affected surrounding soil environment for a long time, and changed the soil structure and nutrient content, made soil relatively stable. The effect of Amorpha roots on soil environment is relatively slow,6-planting-year showed little effect on soil structure and nutrient.5. Using principal component analysis, root distribution parameters were determined as follows: moisture control factors and framework factors,transportation control factors, nitrate and available phosphorus control factors.