杨树人工林地力退化及维护与提高土壤肥力技术的研究*

Abstract

Abstract:

The effect of the same crop, the first crop and the second crop of poplar forest, and the poplar mixed forest with Robinia pseudoacacia L., Hippophae rhamnoides L. and Amorpha fruticosa L. on the soil nutrients, the soil micorbes and the activities of soil enzyme were studied with the data from 48 sample plots in Shandong Province, Liaoning Province, Henan Province, Hebei Province and Beijing. The results showed that (1) the soil nutrients of the same crop forests tended to be reducing with the growth of the forest in the same condition of the site. (2) the soil nutrients and the growth of the second crop forest were evidently reduced compared with those of the first crop forest. (3) the poplar mixed forest could increase the soil fertility, which was an effective way to provent soil degadation.

Key words: Poplar, Soil degadation, Mixed forest

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STUDY ON THE SOIL DEGRADATION OF THE POPLAR PLANTATION AND THE TECHNIQUE TO PRESERVE AND INCREASE SOIL FERTILITY

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