Role of nitrogen-fixing trees in mixed forest Ⅰ. Nitrogen fixation and tree growth of mixed stand with Hippophae rhamnoides

Abstract

Abstract: The role of Hippophae rhamnoides as the undergrowth in mixed forests was studied. The results show that H. rhamnoide has a significant effect of N supply, and its annual average N fixing amount is 54 kg· hm^-2 in 7 years old stand, Comparing with pure Populus sp. And Salix matsuda na stands, nitrogen content in soil of mixed stand is increased by 20～22%, and height increment of main trees by 18～19.4%.

Key words: Nitrogen-fixing tree, Mixed forest, Hippophae rhamnoides, nitrification-denitrification, nitrous oxide (N₂O), restoration wetland, exogenous nitrogen, Yellow River estuary.

He Xingyuan, Zhang Chenggang, Yang Sihe, Zhang Yue, Su Daoyan, Liu Huichang. Role of nitrogen-fixing trees in mixed forest Ⅰ. Nitrogen fixation and tree growth of mixed stand with Hippophae rhamnoides[J]. Chinese Journal of Applied Ecology, 1996, 7(4): 354-358.

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Role of nitrogen-fixing trees in mixed forest Ⅰ. Nitrogen fixation and tree growth of mixed stand with Hippophae rhamnoides

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