Study on spatial distribution characteristics of walnut root system under regulated deficit drip irrigation
[Objective]this paper mainly aims to analyze the distribution characteristics of effective root length less than 2 mm and establish the density function of effective root length to reveal the spatial distribution characteristics of walnut roots under different regulated deficit irrigation.[Methods]The effect of Regulated Deficit Drip Irrigation on the spatial distribution of effective root system of walnut tree was studied by excava-ting the pre-set small soil block(30×20×20)cm by using 14-year-old Wen 185 walnut tree as test ma-terial.[Results]It was found that the total effective root length distribution of walnut trees in W0,W3 and W4 showed a single peak curve in different deficit regulation drip irrigation treatments,and the total effective root length of each deficit regulation treatment was the largest at 20-40 cm,which were 50,959,74,067 and 55,678 cm,respectively.Based on the one-dimensional effective root length density distribution of walnut trees,it was concluded that the root length density of different treatments at different soil depths conformed to exponential distribution,and the root length density of different treatments at different horizontal distances from walnut trees accorded with polynomial distribution.According to the two-dimensional effective root length density distribution of walnut trees,whether it was the change of effective root length along the row direction with the depth of soil layer or the change of effective root length along the plant direction with the depth of soil layer,W0,W3 and W4 treatments all showed that the depth of soil layer was 20-40 cm,and the maximum was30-60 cm away from the row direction of walnut trees,which was 11,794,22,753 and 14,119 cm.[Conclusion]The effects of different Regulated Deficit Drip Irrigation Treatments on the spatial distribution of walnut roots are as follows:root growth of W3>root growth of W4>root growth of W0.
walnut treedeficit drip irrigationroot systemspace distribution
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