Subjects: Biology >> Botany >> Applied botany submitted time 2019-02-25 Cooperative journals: 《广西植物》
Abstract：稳定的边坡群落是公路边坡生态防护的目标。该文为探究高速公路生态护坡工程 10年演替后群落特征，以泌桐高速公路为依托，布设自然恢复、单一狗牙根播种和５个不同播种密度的草灌混播生态防护措施，研究不同恢复方式对边坡群落组成、生活型和物种多样性的影响。结果表明：（1）调查样方内共有 52 种植物，分属于 17 科 49 属。禾本科、菊科和豆科植物共 26 属 29 种，占种总数的 55.77%，表明这 3 科植物在边坡群落演替过程中起重要作用。（2）10 年演替后不同恢复方式下群落中多年生植物比例高于一年生草本植物。（3）在草灌混播样地中，群落物种多样性指数随着播种密度的增加呈先增加后降低的单峰变化趋势，在播种密度 500 株·m-2 处达到最大。（4）草灌混播的生态恢复效果优于纯草本种植和自然恢复方式。（5）播种密度对草灌混播群落类型，地上生物量和物种多样性指数没有显著影响。从植物的生长效果及成本方面考虑，初播密度为 500 ~ 600 株·m-2 的草灌混播可构建较为稳定的边坡植物群落，实现最佳的边坡恢复效果，可应用于类似区域边坡生态恢复工程。
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Plant Protection submitted time 2018-07-18 Cooperative journals: 《广西植物》
Abstract： Open-top chambers (OTCs) is one of the main methods to study the relationship between global climate change and terrestrial ecosystem and has been widely used in the Tibetan plateau. Recent advancement in research on the responses of grassland ecosystems to climate warming by using OTCs is reviewed, which covers the areas of plant phenology, community structure biomass, and soil characteristics. The results show that warming extended the growth season was due to advanced the timings of green-up and delayed yellow period. Warming would benefit the growth of gramineous plants. Warming made the biomass allocation transferred to the deeper soil layer to adjust the drying conditions. The response of the alpine grassland ecosystems to climate change is uncertain, which is influenced by region, community type and experimental time. The change of soil moisture caused by rainfall and permafrost melts regulated the response of ecosystem to warming by regulating the temperature sensitivity of phenology, NPP and soil under warming. Based on the discussions, several aspects of future research should be put forward.
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