不同植被恢复模式沟谷地植被-土壤系统耦合关系评价

植被和土壤的耦合协调关系是沟谷地植被恢复进入良性演替发展阶段的重要标志。研究通过建立9个植被因子和11个土壤因子的2级层次指标体系,采用层次分析法确定各因子的权重,构建沟谷地植被-土壤系统耦合协调模型。结果表明：沟谷地经过20多年的植被恢复,不同植被恢复模式沟谷地的植被-土壤系统发展趋势均处于中级协调发展水平上;其中,刺槐林沟处于中级发展模式水平植被土壤同步型,柠条灌丛沟和天然草地沟为中级发展模式水平土壤滞后型;逐步回归线性分析表明,不同植被属性或土壤属性对其产生重要影响的环境因子（植被群落或土壤条件）存在差异。黄土丘陵区不同植被恢复模式沟谷地植被-土壤系统耦合协调关系存在一定差异,这可能与植物群落优势种的生物学特性密切相关。

Analysis on Vegetation-Soil Coupling Relationship in Gullies with Different Vegetation Restoration Patterns

Coupling coordination between vegetation and soil is an important symbol of positive succession during gully vegetation restoration processes. Based on the investigation and analysis of vegetation and soil of three different vegetation restoration pattern gullies, a two-level target system with nine vegetation factors and eleven soil factors was conducted, and the weights of factors were determined by analytic hierarchy process (AHP). Furthermore, models of vegetation and soil coupling degree and coupling coordinative degree were constructed. The results showed that vegetation-soil system in gullies with different vegetation restoration patterns were all in the intermediate level of coordination after twenty years of vegetation restoration. The development of vegetation and soil in Robinia pseudoacacia forest gully exhibited a synchronous style. The development of soil in Caragana korshinskii shrubland gully and natural grassland gully lagged behind the development of vegetation. Linear regression analysis showed that there were different environmental factors (vegetation community or soil conditions) impacting on different vegetation properties and soil properties. There are some differences in coupling coordination between vegetation and soil in gullies with different vegetation restoration patterns in the hilly Loess Plateau, which may resulted from the biological characteristics of the dominant species in the plant communities.