施水量变化对毛乌素沙地优势植物形态与生长的影响

 以毛乌素沙地优势植物沙柳(Salix psammophila)、杨柴(Hedysarum mongolicum)、油蒿(Artemisia ordosica)和柠条(Caragana intermedia)为对象，人工控制4种施水量来研究这4种植物形态和生长对模拟降水量变化的响应。结果表明不同施水量显著影响着沙柳、杨柴、油蒿和柠条的分枝格局、叶片、生物量及其分配，并且这4种植物的以上特征对不同施水量的响应也有明显差异。在157.5 mm和630.0 mm的施水量之间，施水量的增加对沙柳、油蒿和杨柴枝叶形态

EFFECT OF WATER SUPPLY CHANGE ON MORPHOLOGY AND GROWTH OF DOMINANT PLANTS IN MAOWUSU SANDLAND

It was investigated for the responses of morphology and growth of Artemisia ordosica Krasch., Salix psammophila C. Wang et Ch. Y. Yang, Hedysarum mongolicum Turcz., and Caragana intermedia Kuang et H.C.Fu, four dominant plants in Maowusu sandland, to simulated precipitation change by artificially controlling four water supply levels. The results showed that different water supplies significantly affected the branching pattern, leaf characters, biomass and their distribution of the four plants, and there were obviously differences in the effects of different water supplies on those characteristics among the four plants. In 157.5-630.0 mm water supplies, there were positive effects of increasing water supplies on morphology of branch and leaf and biomass of S. psammophila, H. mongolicum and A. ordosica, but the passive effects on the growth of C. intermedia treated by 157.5 mm and 630.0 mm water supplies. In addition, the root/shoot biomass weight gradually decreased with the increase of water supplies for S. psammophila, H. mongolicum, and C .intermedia, but there was not significant difference in the root/shoot biomass weight compared with A. ordosica treated by the four water supplies.