Forage Yield and Water Use Efficiency of Alfalfa Applied with Silicon under Water Deficit Conditions
Forage Yield and Water Use Efficiency of Alfalfa Applied with Silicon under Water Deficit Conditions
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缺水条件下施硅苜蓿的饲草产量和水分利用效率
DOI：
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发表时间：
2014-01
影响因子：
0.2
通讯作者：
Guo Zheng Gang
中科院分区：
文献类型：
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作者：
Liu Hui Xia;Guo Zheng Gang
通过盆栽试验，研究了紫花苜蓿对牧草产量构成因素和水分利用效率的影响。在不同的土壤水分环境[田间持水量(FWC)的35%、50%、65%和80%]下，植物对硅(Si)的施用(每盆4公斤K2SiO_3)。随着土壤水分水平的增加，紫花苜蓿的饲草生物量和分枝数也随之增加。施肥量仅在FWC的50%和65%时显著提高这两个参数。它还提高了所有土壤水分水平下紫花苜蓿植株的瞬时水分利用效率。而施硅处理的累积水分利用效率仅在50%和60%施硅量时显著增加。与其他土壤水分水平相比，地上部分硅含量以65%的土壤水分含量最高，而根系的硅含量相对较高。施硅降低了蒸腾速率和气孔导度，但对光合作用没有影响。结果表明，施硅对生物量和水分利用效率的促进作用受土壤水分条件的调节。关键词：紫花苜蓿、紫花苜蓿、硅、土壤水分状况、水分利用效率、产量构成因素
A pot experiment was conducted to investigate the response in terms of forage yield components and water use efficiency (WUE) of alfalfa (Medicago sativa L.) plants to silicon (Si) application (4 kg K2SiO3 per pot) at varying soil moisture environments [35%, 50%, 65% and 80% of field water capacity (FWC)]. Alfalfa forage biomass and number of branches increased with increase in soil moisture level. Application significantly increased both parameters only at 50% and 65% of FWC. It also increased the instantaneous WUE of alfalfa plants at all soil moisture levels. On the other hand, the increase in cumulative WUE with Si application was significant only at 50% and 60% FWC. Si concentration in the shoot was highest at 65% of FWC, while in the roots, higher concentrations were obtained at 50% and 65% of FWC relative to the other soil moisture levels. Si application reduced both the transpiration rate and stomatal conductance but had no effect on photosynthetic rate. The results revealed that the promotive effect of Si application on biomass and WUE was regulated by the soil moisture conditions. Key Words: alfalfa, Medicago sativa L., silicon, soil moisture condition, water use efficiency, yield component
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影响因子：
1.2
作者：
J. McElgunn;D. Heinrichs
通讯作者：
J. McElgunn;D. Heinrichs
影响因子：
--
作者：
Huixiao Wang;Changming Liu;Lu Zhang
通讯作者：
Huixiao Wang;Changming Liu;Lu Zhang
影响因子：
1.2
作者：
Michio Suzuki
通讯作者：
Michio Suzuki
影响因子：
--
作者：
Guo, Z. G.;Liu, H. X.;Wang, S. M.
通讯作者：
Wang, S. M.
影响因子：
3.9
作者：
Chen, Wei;Yao, Xiaoqin;Chen, Jining
通讯作者：
Chen, Jining