黑河自然保护区沼泽湿地土壤化学性质的空间分布特征研究

发布时间：2018-06-19 14:58

本文选题：沼泽湿地 + 速效养分　；参考：《草业学报》2017年05期

【摘要】：通过对张掖黑河湿地国家级自然保护区沼泽湿地野外调查、土样采集、实验室分析,利用空间分布格局代替时间演替序列,应用描述性统计及线性回归和相关性的分析方法,对该湿地的速效养分、有机质和土壤全盐含量及pH进行了研究。结果表明,土壤有机质(SOM)含量随着土层深度的增加而显著增加;速效氮(AN)含量垂直分异明显且整体趋势先减少后急剧增加;土壤中速效磷(AP)、速效钾(AK)、全盐含量空间分布存在表聚现象,上高下低的分布格局明显;pH值含量空间分布差异不大但该地区土壤呈碱性和强碱性。pH和SOM存在弱负相关性,pH通过抑制植被的生长来间接影响SOM含量;全盐含量和AK含量具有强烈的乘幂和正线性相关性。全盐、SOM、AN、AP、AK含量均属于中等变异,pH为弱变异。黑河保护区湿地生态系统正处于退化阶段,脆弱性和敏感性使该保护区在干旱半干旱区涵养水源、保持水土的重要性减弱,建立当地自然条件特征基础上长期持续的试验研究,保护与恢复措施迫在眉睫。
[Abstract]:Through field investigation, soil sample collection, laboratory analysis, using spatial distribution pattern instead of time succession sequence, descriptive statistics, linear regression and correlation analysis method were used to analyze the swamp wetland in Zhangye Heihe Wetland National Nature Reserve. The available nutrients, organic matter, total salt content and pH of the wetland were studied. The results showed that the content of soil organic matter (SOM) increased significantly with the increase of soil depth, and the content of available nitrogen (ANM) increased rapidly, and the total content of soil organic matter (SOM) decreased first and then increased sharply. The distribution of total salt in the soil was observed, and the distribution of the total salt in the soil was characterized by the accumulation of APN, K and K, and the spatial distribution of the total salt was observed. The spatial distribution of soil pH was not different from that of high and low, but there was a weak negative correlation between soil alkalinity and strong alkalinity in this area. The soil pH indirectly affected SOM content by inhibiting vegetation growth. Total salt content and AK content have strong power and positive linear correlation. The content of AK in the whole salt of SOMN ANP was moderate variation and pH was weak variation. The wetland ecosystem of Heihe protected area is in the stage of degradation, and its fragility and sensitivity make the importance of water conservation and soil conservation in arid and semi-arid areas less important, and establish the characteristics of local natural conditions for a long time to continue the experimental study. Protection and recovery measures are imminent.
【作者单位】：甘肃农业大学林学院;河西学院河西生态与绿洲农业研究院;
【基金】：国家自然科学基金项目(31460113) 甘肃省自然科学基金(1308RJZA256)资助
【分类号】：S153

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