改则高寒荒漠草地改良效果

Study on improvement effects of alpine grassland at Gaize,Tibet

对西藏阿里地区改则县高寒荒漠退化草地,采用了围栏、围栏+灌溉及围栏+灌溉+补播3种改良措施,以围栏外天然草地为对照,通过研究几个改良措施对草地植物高度、盖度、密度、地上生物量、重要值及物种多样性的影响,寻求适宜于该类退化草地恢复的最佳措施。结果表明,3种改良措施与对照相比均能明显改善退化草地群落中所有植物的生长状况;围栏+灌溉、围栏+灌溉+补播措施可以提高高寒荒漠退化草地的物种多样性;与其他改良措施相比,围栏+灌溉+补播措施可以显著提高高寒荒漠退化草地物种均匀度;综合考虑,围栏+灌溉措施更适宜于改则县高寒荒漠退化草地的改良恢复。

Eeffects of different improved measures on vegetation height,density,coverage,aboveground biomass,important value and species diversity of degenerated alpine grassland located at Gaize county,Tibet,China,was studied.The results showed that that compared with the non improved measures control plots,the vegetation height,density,coverage,biomass,important value and species diversity from the plots received different improved measures were all increased.Simpson index and Shannon-Weiner index were increased significantly after applying enclosure＋irrigation＋reseeding and enclosure＋irrigation measures.Among all the improved measures the enclosure＋irrigation＋reseeding measures significantly increased Pielou evenness index.Overall,enclosure＋irrigation measures are the best improved measures in the degenerated alpine grassland of Gaize county,Tibet.