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(四) 干燥瘠薄地(C型)和干燥瘠薄轻碱地(E型) 这两个类型的共同特点是干旱,瘠薄。C型多是薄沙地,保水保肥力差,树木生长缓慢。E型多为粘质土壤,肥力较高,但含1—3％的盐分,抑制树木生长。这两个类型对树木生长差异不大,因此作为一个类型总结。 C、E型中,加杨仍比其它树种生长速度快,臭椿、旱柳次之,白榆生长最慢。
(D) dry barren (C) and dry barren light base (E) These two types of common features of both arid and barren. C-type is mostly thin sand, poor water and fertilizer, trees grow slowly. E-type mostly clay soil, high fertility, but contains 1-3% of salt, inhibit the growth of trees. These two types have little difference in tree growth and are therefore summarized as a type. C, E type, plus Yang is still faster than other species growth, Ailanthus, Salix followed, the eldest grow the slowest.