Abstract: It is important to study root distribution for simulating its water absorption in different layers of soil, but there are a few data can be used for this work. This paper gives some field experimental results taken at the Beijing Datun Experimental Station, which provide some idea to the user. The parameters of the root discussed in this paper are root length, root weight, actual area of root surface and root diameter. The results show that the vertical distribution of root length, root weight and area of root surface are logarithmly related to the soil depth, and the accumulated root length, root weight and area of root surface are hyperbotically related to it:V=>Z′/ 0.0011+0.0090Z′ LV′=Z′/ 0.0016+0.0087Z′ where V′ is accumulated root weight, LV′ is accumulated root length. Test with the data taken from other surfaces shows that these types of distribution are suitable to other cases too.

Key words: Root system of wheat, Length of root system, Weight of root system, Active surface, Vertical distribution