生态学报2017，Vol.37Issue(14)：4619-4626,8.DOI:10.5846/stxb201604100654
高寒干旱草原披针叶黄华植物群落土壤种子库与地上植被的关系
Relationships between the soil seed bank and above-ground vegetation of a Thermopsis lanceolata community in degraded alpine arid grasslands
摘要
Abstract
The main objective of this study was to address questions with regard to how the soil seed banks and vegetation change along a habitat gradient.In this article,we chose the Thermopsis lanceolata community in degraded alpine arid grasslands as our research subject and determined the relationship between the alpine arid grassland soil seed bank and above-ground vegetation in the Qilian Mountains using field investigation and laboratory analysis.Fifteen species were present in the above-ground vegetation and 18 species were present in the soil seed bank.Dominant above-ground vegetation species included edible grasses such as Stipa krylovii,Aneurolepidium dasystachys and Agropyron cristatum,and non-edible grasses such as Thermopsis Lanceolata and Heteropappus altaicus;however,no other species was observed to exhibit any distinct dominance.Moreover,the degree of similarity between the above-ground vegetation and the soil seed bank was distinctive.The Sorenson similarity index was low between the above-ground vegetation and the soil seed bank along the vegetation gradient.The Sorenson similarity index between the soil seed bank and observed vegetation functional groups exhibited varying characteristics.The number of edible grasses was greater than that of non-edible grasses in the soil seed bank (except V gradient).The number of species of vegetation was also greater than that of non-edible grasses (except III gradient).The number of species in the soil seed bank was not lower than that of the above-ground vegetation species.S.krylovii and A.dasystachys were founded in the above-ground vegetation but not in the soil seed bank,whereas Poa annua,Chenopodium glaucum,Allium polyrhizum,Rumex patientia,Lepidium apetalum,and Gentiana macrophylla were found in the soil seed bank but not in the vegetation.The proportion of biomass attributable to gramineous plants was low for edible grasses,whereas the biomass of poisonous weeds was significantly greater in the vegetation gradient than in the soil seed bank.The plant population biomass had no unanimous relation with seed amount.Edible grass and non-edible grass were significantly negatively correlated (r=-0.940,P=0.018) along the vegetation gradient,but changes in the soil seed bank density were not correlated.The relationship between the biomass of edible grass and the soil seed bank density was uncorrelated.The biomass of non-edible grass and the soil seed bank density were significantly correlated along the vegetation gradient (r =0.902,P =0.036).Our research indicated that the seed bank could retain and restore several species in the process of grassland degradation,and these species could be valuable for vegetation succession and grassland restoration.关键词
干旱草原/披针叶黄华/斑块分布/地上植被/群落相似性Key words
arid grasslands/Thermopsis lanceolata/patch distribution/vegetation/similarity of community引用本文复制引用
张起鹏,王建,赵成章,张志刚,冯婉婉,王珂..高寒干旱草原披针叶黄华植物群落土壤种子库与地上植被的关系[J].生态学报,2017,37(14):4619-4626,8.基金项目
国家自然科学基金项目(91125014) （91125014）
