灌水对沙漠绿洲区甘草生长动态和产量的影响

为研究灌水对沙漠绿洲区甘草（Glycyrrhiza uralensis）生长动态和产量的效应，本研究设2 700（W1）、3 600(W2)、4 500(W3)、5 400(W4)、6 300(W5)和7 200(W6) m3/hm2 6个灌水处理。结果表明，灌水明显促进甘草茎叶、根的生长。处理W4、W5和W6株高显著高于W1、W2和W3（P<0.05），主茎生长速度W6处理较W1快60％，较W2快33％；W3、W4、W5和W6处理地上部干质量显著高于W1（P<0.05），干物质积累速度W3处理较W1快11％；根长、芦径、根干质量随灌水量增加而增加，灌水量超过5 400 m3/hm2则表现下降趋势，处理W3和W4根干质量最高，在根快速生长期W3和W4处理的一年龄和二年龄根干质量增加速度分别较W1快50％和35％。灌水4 500和5 400 m3/hm2，一年龄甘草和二年龄甘草根产量均达到较高水平，但前者灌水效率较后者高，可节水900 m3/hm2。

Effects of irrigation on growth dynamic and yield of Glycyrrhiza uralensis in Minqin Oasis

An experiment of randomized block design was conducted to study the effect of irrigation on growth dynamic and yield of Glycyrrhiza uralensis.The six levels of irrigation,2 700(W1),3 600(W2),4 500(W3),5 400(W4),6 300(W5) and 7 200(W6) m3/ha,were applied.The plant height,root length,root diameter,aerial dry weight and root dry weight were promoted with different irrigation levels.The results indicated that plant height with W4,W5 and W6 treatments were significant higher(P<0.05) than these with W1,W2 and W3 treatments.Growth rate of W6 main stem was 60% faster than W1 and 33% than W2 and W3.The aerial dry weight of W3,W4,W5 and W6 were significant significant higher(P<0.05) than W1 and W2.The accumulation rate of the dry matter with W3 was 11% faster than W1.The root length,root diameter and root dry weight increased with increasing irrigation levels,but decreased when irrigation levels were more than 5 400 m3/ha.The root dry weight of W3 and W4 were significant higher(P<0.05) than others.The accumulation rate of dry matter of annual and biennial roots with W3 and W4 were faster 50% and 35% than W1,respectively.It was concluded that the yield of annual and biennial roots were higher with 4 500 and 5 400 m3/ha irrigation levels,respectively.However,the irrigation efficiency with 4 500 m3/ha was higher than with 5 400 m3/ha treatment.