平行高立式沙障对严重沙化草地植被及土壤种子库的影响

Impacts of high-parallel sand-barrier on vegetation and soil seed bank in the seriously desertified grassland.

以草地严重沙化后形成的沙丘 ,且其上设置有不同年龄 (2～ 3a和 4～ 5a)平行高立式芦苇沙障的地段为研究对象 ,分别对沙丘不同部位 (迎风坡、背风坡和丘间低地 )及沙障不同位置 (沙障迎风面、背风面和两沙障中间 )土壤种子库进行了研究 ,以同类型未设沙障的地段作对照 ,并结合沙丘各部位地上植被特征 ,深入研究了平行高立式沙障对严重沙化草地的影响 .结果表明 ,在严重沙化草地设置平行高立式沙障 ,可使植被盖度及植物种类显著增加 ,有助于生物结皮的发育 .另外 ,还可有效拦截风沙流中所携带的植物种子 。

In the seriously desertified grassland, the sand dunes which have set high-parallel reed sand-barriers for 2--3 years and 4--5 years were selected as research objects. The vegetation and the soil seed bank in the different places of the dune (windward side, leeward side, lowland of sand dune) and the sand-barrier(windward side, leeward side of the barrier, land between two barriers) were investigated. With the dunes without barriers as control, the authors studied the functions of the high-parallel sand-barrier. Results show that high-parallel sand-barrier can increase the plant's coverage and species diversity, increase the quantity and sort of seeds in the soil, and accelerate the development of biological crusts.