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小小佐罗2木虫 (正式写手)
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[求助]
求助，中文摘要汉译英
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| [摘要]【目的】探讨西藏那曲不同退化草地植被的物种组成，土壤种子库存量和物种组成特征、可萌发种子数量和种子萌发生理生态特征，以期为西藏高寒退化草地植被恢复、生产力提高及生态保护提供参考。【方法】采用典型取样法，在项目区选取退化程度不同的4块高寒典型退化草地，采用样线法选取16个样方,于每月的第一天，采取体积为10 cm×10 cm×10cm(包括地上的枯枝落叶)的土样作为分析用的种子库样品，统计并分析种子库中种子、植物及用化学处理方法测定萌发等内容。【结果】实验结果表明，那曲高寒中度退化草地种子库中种子数量最多（530±80.002粒/㎡），其次是重度退化草地和极重度退化草地（250±44.723粒/㎡），轻度退化草地种子库种子存量最少（216±21.335）。种子库中的大部分物种为莎草科（Cyperaceae）、蔷薇科（Rosaceae）、菊科（Compositae）、禾本科（Gramineae）等。在实验室条件下，轻度退化草地种子库中植物种子可萌发数量最少，其次是重度退化草地和极重度退化草地，中度退化草地种子库中植物种子可萌发数量最多。采用适宜浓度的GA3（0.02%和0.05%）和KNO3（0.2%）药品处理高寒草甸草地土壤种子库种子时，能破除种子休眠作用，对种子发芽有促进作用。采用H2SO4处理种子库种子时，不管采用何种浓度的处理，都没有促进种子发芽，相反造成种子不发芽。【结论】轻度退化草地以西藏嵩草和高山嵩草植物为主，牛羊采食量大，且有鼠害为害，可能会导致植物结种量小。中度退化草地和重度退化草地由于菊科、蔷薇科属植物增多，所以种子库中留存植物种子增多。极重度退化草地中，已经没有莎草科植物，主要是菊科、蔷薇科和十字花科植物。不可食植物比例增加，加上牛羊采食很少，所以种子库中植物数量较多。 |
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4楼2012-01-07 14:27:39
terry_well
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爱与雨下(金币+2): 2012-01-07 10:37:48
小小佐罗2(金币+50, 翻译EPI+1): ★★★很有帮助 辛苦你了 2012-01-07 10:37:53
爱与雨下(金币+10): 2012-01-31 12:22:50
爱与雨下: bb代发 2012-01-31 12:22:59
爱与雨下(金币+2): 2012-01-07 10:37:48
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爱与雨下(金币+10): 2012-01-31 12:22:50
爱与雨下: bb代发 2012-01-31 12:22:59
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[Abstract] [Objective] In order to provide some background knowledge for vegetation, productivity and ecological protection of degraded grassland in alpine area of Tibet, the composition of vegetation species, available soil stocks, species composition characteristics, the number of fermentable seeds, and the ecological characteristics in different degraded grassland of Nakchu are systematically investigated. [Methods] A typical sampling method was used, in which 4 different levels of degradation of four typical alpine meadow were selected in the project area, and 16 quadrats were selected by using line transect method. In fact, a volume of 10 cm × 10 cm × 10cm (including ground litter) soil samples was taken on the first day of each month to be used as seed bank samples, and seed banks and seed, chemical processing plants and determined germination et al. were summarized and analyzed. [Results] It was shown that the largest number of seeds (530 ± 80.002 grains/m) was obtained for the moderately degraded grassland at Nagqu alpine, followed by severe and very severe degradation of grasslands (250 ± 44.723 grains/m), with mild degradation grass seed stock for at least (216 ± 21.335 grains/m). Most species in the seed bank are Cyperaceae, the Rosaceae, Compositae, Gramineae, and so on. Under laboratory conditions, the number seeds that can germinate in the seed bank of mild degradation of grassland was the least, followed by severe and very severe degradation of grasslands, and the largest number of seeds that can germinate was obtained in moderately degraded grassland seed bank. Use of appropriate drug which was composed of GA3 (0.02% and 0.05%) and KNO3 (0.2%) to treat seeds from grassland soil could break the seed dormancy effect on the role of promoting seed germination. However, when with treatment of H2SO4, whatever the concentration, it can not promote seed germination, while the opposite results were obtained. [Conclusions] there are mainly Kobresia alpine at slightly degraded grassland in Tibet Kobresia, and a large number of them were fed to cattle and sheep. The rodent damage resulted in a smaller amount seeds for many plant species. Due to the increase of asteraceae and rosaceae species at moderate and severe degradation of grassland, the retained seeds in seed bank were increased. There were no sedge plants, but mainly Asteraceae, Rosaceae and cruciferous plants for very severe degraded grassland. With the increase the proportion of non-food plants, and very few could fed to the cattle and sheep, a larger number of plants seeds therefore obtained in its seed banks. 可能是太长了太专业，没人帮你搞，只能试试了。仅供参考。  |
2楼2012-01-07 00:44:26
小小佐罗2
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3楼2012-01-07 10:33:48
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