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为了评估铁尾矿区废弃地的植被恢复中,利用沙棘-桑树人工混交林提高林地养分总体水平的可行性,测定混交林中沙棘、桑树和草本植物的地上部分、根系及枯枝落叶中的N、P、K、Ca、Mg含量与贮量,测定沙棘、桑树根系周围土壤中的养分含量。结果表明:沙棘的根、干、枝、叶、皮中的N含量明显高于桑树,尤其是不同土层根系中的N含量可达到桑树根系的3.03～4.33倍,沙棘根系中的Ca、Mg含量高于桑树,P含量与桑树相近,而桑树地上部分的P、K、Ca、Mg含量以及各土层根系中的K含量大多高于沙棘;沙棘根系周围土壤中的全N含量高于桑树根系周围土壤,其平均含量为桑树的1.88倍,根系周围表层0～20 cm土壤的全N含量为桑树的3.18倍;混交林中乔木、草本、枯落物的总养分贮量大小为:沙棘>枯枝落叶>桑树>草本植物,其中沙棘的养分贮量占混交林系统养分总贮量的56.10%。研究结果提示:沙棘在整个混交林系统的养分分配中起到支配性作用,可为桑树的正常生长发育提供良好的养分空间,沙棘-桑树混交林是生态效益与经济效益双赢的混交模式。
In order to evaluate the feasibility of improving the overall nutrient level of the mixed forest by using the seabuckthorn-mulberry mixed plantation in order to evaluate the restoration of the vegetation in the wasteland of the iron tailings area, the N, N and K concentrations in the aerial parts, roots and litter of the mixed forest , P, K, Ca, Mg content and storage, the determination of nutrient content in the soil around the roots of sea buckthorn and mulberry. The results showed that the content of N in root, stem, branch, leaf and skin of Hippophae rhamnoides L. was significantly higher than that of mulberry, especially the content of N in roots of different soil layers reached 3.03-4.33 times that of mulberry roots. The contents of Ca, Mg Content of P was higher than that of mulberry, P content was similar to mulberry, P, K, Ca and Mg contents of mulberry tops and K contents of roots were higher than those of seabuckthorn. The content of total N in soil around seabuckthorn root was higher than that of mulberry The average content of soil around root system was 1.88 times that of mulberry tree, and the total N content of 0-20 cm soil layer around the root system was 3.18 times of that of mulberry tree. The total nutrient storage capacity of tree, herb and litter in mixed forest was: Seabuckthorn > Litter> mulberry> herb, in which the nutrient reserves of seabuckthorn accounted for 56.10% of the total nutrient in mixed forest system. The results suggest that seabuckthorn plays a dominant role in the nutrient allocation of the whole mixed forest system, which can provide good space for the normal growth and development of mulberry. The mixed mode of seabuckthorn and mulberry mixed forest is a win-win mode of ecological and economic benefits.