河西走廊荒漠草地黑果枸杞群落结构特征及土壤性质研究

探讨河西走廊荒漠草地黑果枸杞群落特征与土壤性质之间的关系,为黑果枸杞种群保护提供理论依据。通过对河西走廊黑果枸杞群落物种组成、多样性及土壤性质的研究,结果表明：1)调查群落中共有植物种27种,分属10科27属,其中灌木植物7种,多年生草本11种,1年生草本9种;单科单属种较多,占到了总科数的1/2;不同区域内黑果枸杞群落优势地位明显。2)河西走廊黑果枸杞群落不同区域内土壤性质差异显著,民勤县白土井、酒泉市金塔县西坝乡电导率最高,分别为8 393.06、6 652.78 ms,酒泉市玉门镇刺窝湖黑果枸杞样地全N、速效P含量最高,分别为0.134%、1.624 mg·100 g^-1,与其他样地间差异显著(P<0.05),土壤养分含量总体偏低、含量不均。3)河西走廊黑果枸杞群落物种多样性以民勤县兴和村轻度盐碱地物种丰富度(R)、辛普森(Simpson)指数、香浓-威纳(Shanon-Wiener)指数均高于中度、重度和极重度盐碱地,分别为10、0.714、1.532,但Pielou均匀度指数、生态优势度低于中度、重度和极重度盐碱地,不同盐渍化程度黑果枸杞群落物种组...

Community Structure Characteristics and Soil Properties of Lycium ruthenicum in Desert Grassland in Hexi Corridor

In order to explore the relationship between the community characteristics and soil properties of Lycium ruthenicum in the desert grasslands of the Hexi Corridor,and to provide a theoretical basis for the protection of the L.ruthenicum populations,the species composition,diversity and soil properties of the L.ruthenicum community in Hexi Corridor were investigated.The results showed that 1) there existed 27 plant species in the investigated community,belonging to 10 families and 27 genera,including 7 species of shrubs,11 species of perennial herbs,and 9 species of annual herbs.Many single family and single genus species were found,accounting for half of the total number of families.The community dominant position of L.ruthenicum in different regions was obvious,which played an important role in the structure,ecosystem function and stability of the community.2) Significant differences were observed in soil properties of L.ruthenicum in different regions of the Hexi Corridor.Baitujing in Minqin County and Xiba in Jinta County had the highest soil electrical conductivity:8 393.06 and 6 652.78 ms,respectively.The total N and readily available P content of L.ruthenicum sample plot in Ciwo Lake,Jiuquan City were the highest,which were 0.134% and 1.624 mg/100g,respectively,showing a significant difference with other plots (P<0.05),and the soil nutrient content was generally low and uneven content.3)For the species diversity of L.ruthenicum community in the Hexi Corridor,the species richness R,Simpson index and Shanon-Wiener index of mild saline-alkali land in Xinghe Village,Minqin County were higher than those of moderate,severe and extremely severe saline-alkali land,which were 10,0.714,and 1.532,respectively.But the Pielou evenness index and ecological dominance were lower than those of moderate,severe and extremely severe saline-alkali lands.The species composition of L.ruthenicum community with different salinization degrees was inconsistent,the community diversity index was low,the species richness was low,the interspecific encounter rate was low,the ecological dominance index was high,and the species distribution in the community was uneven.4) There were different degrees of correlation between soil physicochemical properties and the species diversity of L.ruthenicum in the Hexi Corridor.Soil conductivity had a very significant negative correlation with plant species richness R and Shanon-Wiener index,and it was a significant negative correlation with Simpson index,Pie interspecific encounter rate and ecological dominance.