化学固沙剂对退化沙地植物多样性与微生物多样性的影响

Influence of Sand Fixation Chemicals on Biodiversities of Plants and Microorganisms on Degraded Sands

化学-生物固沙是一种有效固沙技术。为了解化学固沙剂对沙地植物多样性与微生物多样性的影响,以450、600、750 kg/hm2固沙剂和未喷施固沙剂(CK)为研究处理,生物、微生物多样性分析结果表明:应用固沙剂后群落重要值随着优势度增加而增加,随着优势度降低而降低;各处理均比对照群落高度、盖度、生物量有提高,表明应用固沙剂后对群落的生长具有促进作用,以600 kg/hm2处理最好。固沙剂喷施量的增加植物、微生物多样性都表现为减少,而植物、微生物优势度都表现为增加。植物多样性与微生物线性相关,同样植物优势度与微生物优势度存在线性相关。植物通过影响土壤环境,进而影响土壤微生物群落结构和多样性。

Chemical-biological sand fixation is an effective technology for sand control. In order to understandthe effects of sand fixation chemicals on biodiversities of plants and microorganisms, this study investigatedtreatments such as 450, 600, 750 kg/hm2 chemical and took no chemical treatment as control, and analyzed thebiodiversities of plants and microorganisms. The results showed that after application of chemical, theimportance value of community increased as dominance. The height, coverage and biomass increased in alltreatments except control, which indicated that sand fixation chemical had an improving effect on growth ofcommunity and treatment of 600 kg/hm2 had the best effect. As the application amount increased, thebiodiversity of plants and microorganisms both decreased, however, the dominance both increased. There was alinear correlation between diversity of plants and microorganisms, as well as the dominance. Plants influencedthe soil environment and then had an impact on the structure of microorganism community and its biodiversity.