祁连山北坡草甸草原地上生物量与土壤理化性质的关系

发布时间：2018-09-08 11:30

【摘要】：为了揭示祁连山北坡草甸草原的地上生物量与土壤理化性质的关系,在祁连山北坡东、中、西部选择了三个典型样地,连续收集了两个生长季的野外采样数据,开展植物地上生物量与土壤理化性质的关系研究。结果表明:(1)2014年生长季每个样地的地上总生物量均大于2013年生长季的,且两个生长季的地上总生物量从东到西均依次增加;(2)土壤含水量、土壤温度、土壤有机质、有效钾、pH值在不同样地、不同生长季、不同土层差异性明显,而土壤碱解氮、有效磷相对稳定,差异性不明显;(3)地上生物量与土壤温度呈显著正相关,与土壤水分相关性不明显,与有效磷呈极显著正相关,与pH值呈显著正相关,对地上生物量影响较大的因子是地温、有效磷以及pH值。土壤养分主要通过影响土壤的理化性质来决定植被的生长,进而影响植物的生物量。
[Abstract]:In order to reveal the relationship between aboveground biomass and soil physical and chemical properties of meadow steppe on the northern slope of Qilian Mountain, three typical plots were selected in the east, middle and west of the northern slope of Qilian Mountain, and two growing season field sampling data were collected continuously. The relationship between plant aboveground biomass and soil physical and chemical properties was studied. The results showed that: (1) the total aboveground biomass of each plot in 2014 was higher than that in 2013, and the total aboveground biomass of two growing seasons increased from east to west, (2) soil water content, soil temperature, soil organic matter, The pH value of available potassium was different in different growing seasons, but the soil alkali-hydrolyzed nitrogen and available phosphorus were relatively stable, but the differences were not obvious. (3) the aboveground biomass was significantly positively correlated with soil temperature. There was no significant correlation with soil moisture, significant positive correlation with available phosphorus, and significant positive correlation with pH value. The factors that had a great influence on aboveground biomass were soil temperature, available phosphorus and pH value. Soil nutrients mainly affect the physical and chemical properties of soil to determine the growth of vegetation, and then affect the biomass of plants.
【作者单位】：西北师范大学地理与环境科学学院;
【基金】：国家自然科学基金地区科学基金项目(41161017)
【分类号】：S812

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