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| Research on Stump Grafting Regeneration of Populus tomentosa in Shelter-belt on Farmland of Desert Oasis |
| Man Duoqing Yang Zihui Xu Xianying Wu Chunrong Ding Feng |
| Gansu Desert Control Research Institute, 733000, Wuwei, Gansu, China |
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Abstract The grafting survival ratio of 2n and 3n Populus tomentosa is influenced by different poplar family and species of shelter belt cuttings. When stump species is Sect. Populus ones, its grafting affinity is the best, survival ratio is high and growth vigorously, the second is the stump species of Sect. Tacamahaca Spach and Sect. Aigeiros Duby , and each grafting variety of 2n or 3n Populus tomentosa has some differences to different stump species. Through grafting shoot introduction with different varieties of 2n and 3n Populus tomentosa , the grafters of different varieties were grafted to the original shelter belt stumps of P. nigra var. thevestina , the results showed that Populus tomentosa cv. Hebeinica in 2n varieties and YX128 of Populus tomentosa in 3n varieties grow the best. When three grafters were grafted to every stump of P. gansuensis , the survival ratio at least one grafter in regenerating shelter belt of Populus tomentosa (3n) is 88 8% after 3 winters. The difference of grafting seedling height growth with stump diameters and grafting number is not obvious, and so is the 2n and 3n variety. However, the grafting seedling base diameter difference with them is more obvious, the growth of seedling base diameter is positive correlation with stump ones, the seedling diameter reduce remarkably with the increasing grafting No, and the diameter growth of 3n varieties is more obvious than that of 2n ones. The height of one year grafting seedlings is about 2.0～4.4m, the average grafting forest belts for two years are 6.2m high. The average height and the diameters are 7.3m, 7.65cm with 2n varieties and 7.4m, 8.87cm with 3n varieties for three years, and the regenerating sheltered effectiveness will be reached to more than 90% of original shelter belts in farmland after four years.
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Received: 10 January 2004
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