水盐处理对小桐子生长和水分利用的影响

Effect of water and salt treatment on growth and water use efficiency of Jatropha curcas L.

为研究盐胁迫下小桐子的生长和水分利用,通过水盐处理种植小桐子进行试验.研究采用盆栽试验,共设3种盐分处理(风干土中分别加入NaCl分析纯的质量比为S0:0;S1:2.5 g/kg;S2:5.0 g/kg)和3种灌水处理(W1:0.9 L;W2:1.8 L;W3:2.4 L)对小桐子进行63 d的试验处理.结果表明:施盐分处理相同时,与W1和W2水平相比,W3水平小桐子的株高、茎粗、壮苗指数、干物质量和水分利用效率均显著提高(P<0.05).因此,试验中小桐子最优的灌水量为W3.当灌水量为W3时,与W3SO相比较,处理W3S1促进小桐子的干物质量及水分利用效率显著提高,而处理W3S2的小桐子的干物质量及水分利用效率下降甚微(P>0.05).可见,土壤含盐量较低时,适宜的土壤水分调控有助于提高小桐子的生长和水分利用效率;土壤含盐量较高时,适宜的土壤水分调控有助于提高小桐子的抗盐胁迫能力.

In order to provide theoretical support to improve growth and water use efficiency of Jatropha curcas L. with different irrigation under salt stress treatments,three salt（ pure Na Cl） contents（ S0： 0,S1： 2. 5 g/kg,S2： 5. 0 g/kg） and three water levels（ W1： 0. 9 L,W2： 1. 8 L,W3： 2. 4 L） were used in a pot experiment for 63 days. The results show that height diameter,stem diameter,healthy index seedlings,dry matter and irrigation water use efficiency at W3 were significantly higher than those at W1 and W2 in the same salt condition,so the best water level was W3. Compared with W3S0,W3S1＇ s dry matter,water use efficiency were increasing greatly and there was no distinct difference between W3S0 and W3S2. Thus,in low salt stress condition,the suitable amount of water irrigation control was good for plants＇ growth and water use efficiency. In high salt stress condition,the suitable amount of water irrigation control was helpful for Jatropha curcas L. to improve the ability to adapt to the salty environments.