摘要
针对毛乌素沙地柠条不同种植密度对植物群落稳定性的影响,选择不同种植密度和自然恢复地进行研究对比,结果表明:自然恢复地以狗尾草、虫实、猪毛菜为主要优势种,建植柠条后,种植密度为1660丛/公顷的带间草本植物的重要值发生了很大的变化。多年生的植物种草木樨状黄芪、白草开始侵入并逐步成为优势种。种植密度为2490丛/公顷的带间草本植物则逐步演替为白草、沙蒿为主的植物群落。群落的植被盖度则以2490丛/公顷、1660丛/公顷的较高,分别达到了86.17%、80.33%,3330丛/公顷最低为64.17%,比自然恢复地低13.28%。通过对种植不同密度柠条林各样地群落种百分数与累积相对频度比值的计算,发现种植密度为2490丛/公顷、1660丛/公顷样地群落种百分数与累积相对频度比值最接近20/80的稳定点。可以看出随着柠条带间距的增加柠条带内的植物群落更加趋于稳定。
As For the effect of Caragana different planting density on stability of plant community in Maowusu desert, compared sand resuming by planting Caragana of different density and naturally resuming. The results showed that Setacia viridis, Salsola oUina pall , Salsola coUina were the major dominant species in naturally resuming, After planting Caragana, the important value of herbaceous plant in zone with planting density of 1 660 clusters/hm^2 of Caragana had greatly changed. Perennial plant species Astragalus melilttoides Pall, Pennisetum flaecidum began to invade and become dominant species. Major herbaceous plant in zone with density of 2 490 clusters/hm^2 step by step was replaced by Pennisetumflaecidum and Artemisia arenaria. The vegetation coverage of sand with 2 490 clusters/hm^2 and 1 660 clusters/hm^2 was higher, and reached 8617% and 8033% respectively;, the lowest with 3 330 clusters/hm^2 was 64.17% and lower 13.28% than natural recovery land . By calculating the percent and accumulated relative frequency ratio of plant community of sand planted Caragana with different density, discoveried the percent and accumulated relative frequency ratio of plant community of sand with planting density of 2 490 clusters/hm^2 and 1 660 clusters/hm^2 were most close to 20/80 point ofsafes It canshow thatwiththeincreaseofplantingspaceofCaragana, the plant community tend to be more stable.
出处
《草业与畜牧》
2006年第10期9-12,共4页
Pruataculture & Animal Husbandry
