生态系统健康评价方法在退化梭梭群落分析中的应用

Application of ecosystem health evaluation method in analysis of degraded Haloxylon ammodendron community

健康序列评价指标的确定是健康序列分析的关键。本文运用模糊判别方法对民勤沙区梭梭群落的健康状况进行了判别分析,建立的退化植物群落健康评价指标体系包括了植物的状态指标、病态指标、多样性指标和自然更新能力指标等4个方面,分析结果较好地反映了不同群落的健康状况,且反映了优势种植物和伴生植物与群落健康序列的关系。一般来说,对于多个研究对象的健康状况进行比较排序要比只对一个研究对象的健康状况做出评价容易得多。对于荒漠植物群落应该分别乔木、灌木和草本植物进行一级判别和二级判别,对二级判别则必须进行灵敏度分析。

Determination of health sequence＇ s evaluation indices is the key of health sequence analysis. In this paper, fuzzy discrimination method was used to analyze the health status of Haloxylon ammodendron community in Minqin sandy region, and a health evaluation index sys- tem for degraded plant communities was established, including plant state index, morbidity in- dex, biodiversity index, and natural regeneration capacity index. The ~esults better reflected the health status of different communities, and the relationships between community health sequence and dominant and associated plant species. In general, the comparative study on the health status evaluation of several targets was much easier than that of only one target. For desert plant com- munities, first- and second-grade discriminations should be conducted with trees, shrubs, and herbaceous plants separately, and a sensitivity analysis should be carried out on second-grade discrimination.