Research on the relationship between root distribution characteristics of Jun-jujube and soil nutrient in arid area
[Objective]To study the distribution characteristics of absorbing roots and conducting roots and their relationship with soil nutrients of Jun-jujube.[Methods]A six-year-old Jun-jujube in Aral reclamation area.The root length,root surface area and root volume of Jun-jujube with different diameters were measured by using the WinRHIZO root analysis system,and the contents of alkali hydrolyzable nitrogen,available phosphorus and available potassium in the soil(0-60 cm depth)in different growth periods were measured.In addition,the correlation between root distribution and soil nutrients was analyzed.[Results]In each soil space,the length density of absorbing root was always higher than that of conducting root,while the root volume was the opposite.In the vertical direction,the root length density and root surface area density of absorbing root and conducting root both decreased with the depth of soil layer,and the root density in 0-20 cm soil layer was the densest,with the proportion of absorbing root length density and root surface area density be-ing 77.1％and 76.5％,respectively,and the proportion of conducting root being 76.0％and 74.6％,respec-tively.In the horizontal direction,the absorption roots were densely distributed in the soil at the horizontal dis-tance of 0-20 cm and 20-40 cm.The proportion of root length density was between 20.0％-20.7％,the proportion of root surface area density was 20.0％-22.2％,and the proportion of conducting roots 21.8％-22.1％,18.4％-23.8％,respectively;The absorption root length density and root surface area density of the soil at the horizontal distance of 40-140 cm accounted for 8.8％-14.4％,and the transport root was 8.7％-14.5％.The absorption root length density and root surface area density decreased slowly with the increase of the horizontal distance,and the transport root showed upward and downward reciprocating changes,with differences.The correlation coefficient between the root length density and root surface area density of absorb-ing root and conducting root and soil alkali-hydrolyzable nitrogen and available phosphorus at the stage of leaf expansion was greater than 0.820,and the correlation coefficient between the root length density and root sur-face area density of absorbing root and soil available phosphorus at the stage of leaf expansion was greater than 0.809,showing a very significant positive correlation.The root length density and root surface area density had a negative correlation with available potassium,but the correlation was not significant.[Conclusion]The root distribution of Junzao jujube is relatively shallow,and the soil root distribution at the depth of 0-20 cm and the horizontal distance of 0-40 cm is relatively dense,which is an important area for water and nutrient utiliza-tion.The vertical distribution of root system is closely related to the content of alkali-hydrolyzable nitrogen and available phosphorus in the soil at the leaf expansion and young fruit stage.
万方数据
维普
