石灰岩质高陡边坡覆绿生态地质指标阈值研究

为探索高陡边坡植被重建所需的地下生境条件,依托生态地质学理论,以山东、河南地区石灰岩质高陡边坡为研究对象,通过对边坡上有植物生长的裂缝生境条件进行调查,测量壁面体裂隙率、裂隙的温湿度、隙缝中土壤肥分,并运用样地法统计石灰岩山坡植物根群圈的特征,归纳总结生态地质指标阈值。结果表明华北石灰岩质高陡边坡覆绿生态地质指标阈值包括:(1)岩体体裂隙率适应值范围为1.2‰~5%;(2)小乔木与灌木的根群圈深度为20~40 cm,此范围温湿度适应值分别为0~26℃,90%~100%,20~40 cm也即物种的地境稳定层;(3)土壤也需满足一定的肥分指标。连通性良好的裂隙网络、适宜并相对稳定的温湿度、一定的土壤肥分是石灰岩质边坡植被重建过程中的重要条件,保障了植物生长所需的稳定地境。

Threshold of Ecological Geo-indicators of Green Coating onHigh-steep Slope of Limestone

In the aim of exploring the underground habitat conditions for vegetation reconstruction of high and steep slopes, we investigated the habitat conditions of fractures where plants grow by measuring body fracture rate, temperature and humidity of fractures, and soil fertility in the fractures.Furthermore, we summarized the threshold of ecological geo-indicators through statistics of root mass of plants in limestone slopes by using sampling land method.The high-steep slopes of limestone in Shandong and Henan Regions were taken as research objects.Results revealed that the thresholds of ecological geo-indicators of green coating of high-steep slopes of limestone in North China include: 1) the adaptive range of body fracture rate of rock is 1.2‰~5%;2)the root mass depth of small arbor and shrub is 20~40 cm which is the stable layer of plant species in underground habitat and the thresholds of adaptable temperature and humidity are 0~26 ℃, 90%~100%, respectively;3) the soil also needs to meet certain fertility standards.Connected fracture network, adaptable and relatively stable temperature and humidity,given soil nutrient are important elements in the process of vegetation reconstruction of the limestone slopes,guaranteeing the stable underground habit needed for plant growth.