不同植被重建模式下赣北红壤侵蚀坡地土壤养分效应

为了探讨植被重建模式与土壤养分的关系,合理改良与利用红壤侵蚀坡地,本文分析了草本、果树、果树+草、果树+草+农作物和果树+农作物等不同植被重建模式对土壤养分的影响,并运用灰色关联分析方法对不同恢复模式的土壤养分效应进行综合评价。研究结果表明:不同植被重建模式土壤养分效应差异显著,以果树+横坡套种农作物改善土壤养分效应最好,然后依次是果树+草本模式(全区覆盖优于带状覆盖)、果+草+农作物模式、果树+纵坡套种农作物,草本、果树模式改善土壤养分效应最差。赣北侵蚀坡地植被恢复,可以优先考虑恢复果树+横坡套种农作物模式和果树+草本模式。

Soils nutrient under different vegetation restoration models in red soil erosion slope,north of Jiangxi Province

To explore relationships between vegetation restoration models and soil nutrient, and provide the advices for rational utilization of the land resources in eroded slope of red soils,effects of vegetation resto-ration model on soil nutrient were analyzed with the gray incidence analysis method, using different vegeta-tions, such as grasses, orchard, fruit trees+grasses, fruit trees &crops and fruit trees+crops. Results show that the effects of soil nutrient vary from vegetation to vegetation and from model to model. The model that fruits interplanted horizontally with corps is optimal in integrated effect, and followed by the models fruit trees + grasse, fruit treess + grasses & crops and better than the models fruit trees interplanted vertically with crops, grasses. Orchard is the least rational model in this area.In the vegetation restoration in severely eroded hilly areas of red soils in North Jiangxi Province, it is recommended to adopt the models of fruit trees+ contoured crops and ruit trees + grass for extension of vegetation restoration in the hilly regions.