Yu Feihai, Dong Ming, Krüsi Bertil
Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, China.
Swiss Federal Institute for Forest, Snow and Landscape Research, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland.
New Phytol. 2004 Jun;162(3):697-704. doi: 10.1111/j.1469-8137.2004.01073.x.
• Rhizomatous clonal plants frequently colonize and stabilize dunes on sea and lake shores, and in inland deserts and desertified areas, where sand burial is common. To date, little attention has been paid to how clonal integration affects their ability to withstand sand burial. • In an inland dune Psammochloa villosa ramets were buried under 0, 20, 40 and 60 cm of sand, and the rhizomes at the edges of the 50 × 50 cm treatment quadrats were either severed or left connected. • With increasing burial depth the surviving ramets of P. villosa decreased markedly both in number and in size (number of leaves and above-ground biomass). In the connected quadrats, however, sand burial resulted in significantly smaller decreases than in the severed quadrats of the number, but not in size, of the surviving P. villosa ramets. • We conclude that clonal integration increased the ability of P. villosa to withstand sand burial, and that P. villosa could emerge from deep burial probably by elongating vertical structures with the help of the energy imported from the connected, unburied ramets.
• 根茎型克隆植物常常在海岸、湖岸以及内陆沙漠和荒漠化地区的沙丘上定殖并使其稳定下来，在这些地方沙埋现象很常见。迄今为止，很少有人关注克隆整合如何影响它们抵御沙埋的能力。
• 在内陆沙丘，将沙芦草分株埋于0、20、40和60厘米深的沙子下，在50×50厘米处理样方边缘的根茎要么切断，要么保持相连。
• 随着埋深增加，沙芦草存活分株的数量和大小（叶片数量和地上生物量）均显著减少。然而，在相连的样方中，沙埋导致存活沙芦草分株数量的减少幅度明显小于切断根茎的样方，但分株大小的减少幅度并非如此。
• 我们得出结论，克隆整合增强了沙芦草抵御沙埋的能力，并且沙芦草可能通过借助从相连的未被掩埋分株输入的能量伸长垂直结构而从深埋中存活下来。
