Effect of soil compaction on root characters and nitrogen metabolism of potted seedlings of Pingyitiancha (Malus hupehensis)
Experiment was conducted with petted seedlings of Pingyitiancha, a variety of Malus hupehensis Rehd. for studying the effects of soil compaction (1.1, 1.3 and 1.5 g·cm~-3) on the root characters and nitrogen metabolism of the seedlings. The results showed that the root growth of the potted seedlings were inhibited as the soil compaction increasing, including roots length and lateral root number, the total mass and area of primary and fine roots. The activity was decreased, while the NO_3~-N contents in leaves and roots increased as the soil compaction increasing. The highest NH_4~+-N contents in leaves and roots occurred in 1.3 g·cm~(-3) treatment, then the 1.5 g·cm~(-3) treatment and the 1.1 g·cm~(-3) treatment was the lowest. The NR activity of leaf and GS activity of root was ranked as the following order: 1.1 g·cm~(-3) treatment 1.3 g·cm~(-3) treatment 1.5 g·cm~(-3) treatment, while the NR activity of root and GS activity of leaf were 1.3 g·cm~(-3) treatment1.1 g·cm~(-3) treatment1.5 g·cm~(-3) treatment. All these results showed that the soil compaction was a crucial factor affecting nitrogen metabolism, and the functions of absorbing and utilizing nutrients in plants were affected subsequently.
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