| Plantation of Phyllostachys violascens in long-term intensively cultivated process appear siteproductivity decline phenomenon, which become more serious, and the imbalance of silicon supplying,and at the same time also suffer from low temperature stress like late spring coldness. Those have beenaffecting sustainable development of plantation of Phyllostachys violascens. Some studies have beensuggested that silicon could increase Plant biological stress and non-biological stress resistance could beincreased with silicon, promote plant growth, increase production, and so on. If applying siliconfertilizer in plantation of Phyllostachys violascens could alleviate site productivity decline phenomenon,improve the ability of resistance to low temperature stress, improve production and operation, thisproblem need to be studied. At present, application and impact of silicon fertilizer on plantation of Leibamboo are less and lack of pertinence.The impact of silicon fertilizer on the growth, production and resistance to low temperature stressof Lei bamboo were studied in this article by analyzing leaves silicon content, soil available siliconcontent, biomass, photosynthesis parameters, yield and resistance to low temperature stress under thedifferent level of silicon fertilizer on plantation and pot of Lei bamboo. The results were as follows.1. The silicon in the soil and soil pH value could be both significantly increased with siliconfertilizer. Accumulation of Lei bamboo, soil available silicon and pH were both increased with theincrease of silicon fertilizer level. Significant effect of applying silicon fertilizer could be achieved,when the content of soil available silicon was at115.5~137.5mg/kg after applying silicon fertilizer625kg/hm~2in the field or more than4g/kg in the pot.2. The peak of silicon absorption and accumulation of Lei bamboo was the time from June toAugust. The silicon fertilizer was beneficial to supplying silicon for absorption and accumulation of Leibamboo and can improve Lei bamboo silicon accumulation, before burgeon and unfold of Lei bamboo,namely before or after May. Silicon accumulations of leaves were increased with the increase of siliconfertilizer level. But after reached a certain degree, its increment would reduce with the increase ofsilicon fertilizer level.3. The weight of Lei bamboo shoot and biomass of pot Lei bamboo were both effectively improvedwith silicon fertilizer. The weight of Lei bamboo shoot was increased along with the increase of siliconfertilizer level, but the increase of the amount of bamboo shoot was not significant. The pot Lei bamboobiomass was increased first and declined later along with the increase of silicon fertilizer content. Thesuitable silicon fertilizer level could promote the growth of Lei bamboo, but excess silicon fertilizerlevel (8g/kg) even could descend biomass.4. Silicon fertilizer could promote Lei bamboo leaf photosynthesis, increase the photosynthetic rate,lower transpiration rate and enhance water use efficiency. The promoting effects on photosynthesis aremost obvious at the level4g/kg and8g/kg of silicon fertilizer.5. Resistance to low temperature stress of pot Lei bamboo could be enhanced by silicon fertilizer.MDA content and cell membrane permeability could be reduced by silicon fertilizer. The activities of SOD, POD and CAT were enhanced. Soluble protein content, free proline contentand chlorophyll were all increased. Silicon could protect plasmalemma, enhance protective enzymeactivity, alleviate the harm of low temperature to chloroplasts and protect the structural integrity of thechloroplast. The resistance to low temperature stress of Lei bamboo at4g/kg and8g/kg of siliconfertilizer level is the most effective.In conclusion, silicon can effectively increase available silicon in the soil and improve soil pHvalue, improve Lei bamboo silicon accumulation, promote Lei bamboo leaf photosynthesis, enhanceresistance to low temperature stress of pot Lei bamboo. The effcet of applying silicon fertilizer canreach the most significant, as the content of soil available silicon reach115.5~137.5mg/kg by applying625kg/hm~2or4g/kg silicon fertilizer, before and after May. |
