灌木和草本药用植物对喀斯特生境的生理适应策略

Karst area is a special terrain mainly consisting of limestone in south China．Water deficit withthin soil is its typical characteristics．The problem of desertification is attracting more attentions in Karst area．Soil severely erodes，bedrock appears massively，and productivity decreases in limestone districts，which are all caused by human's unreasonable social economic activity．It is becoming urgent to carry out ecological restoration in limestone desertification region. In the project, we selected Sophora subprostrata and Corydalis saxicola on shrub and herb medicinal plants' behalf as material, studied and compared the ecophysiological responses of them in Karst areas. According to the change of secondary compound content, growth characteristics, seed germination, photosynthetic characteristics, biomass and some physiological and biochemiscal parameters of Sophora subprostrata and Corydalis saxicola grown in different geological location, soil gathered from different degeneration progress, imitative water stress, soil depletion, high soil calcium conditions treatment, the characteristics and mechanisms of ecophysiological adaptation of medicinal plants will be found. The results would cover the shortage of ecology of plant secondary metabolism, and provide a scientific basis on further deep exploration of adaptation mechanisms of typical plants to karst environment, furthermore, it would be useful for ecological restoration in Karst areas.

立足于喀斯特地区生态修复的热点问题，采用野外测定和模拟实验相结合的方法，本项目以广豆根和岩黄连两个喀斯特地区特有药用植物为实验材料，探索分析灌木和草本药用植物对喀斯特生境的适应策略及其异同。根据两种植物在野外不同分布地点及取自不同喀斯特区域的土壤处理、模拟水分处理、养分贫瘠处理和高钙处理下的次生化合物积累、种子发芽、个体生长速率、叶片光合速率、一些生理生化指标和生物量积累等的变异规律，明确不同生活型药用植物对喀斯特生境的适应性和适应机制。通过研究，不仅弥补了植物次生代谢生态学研究在喀斯特生境的不足，而且能够更深入地了解植物对喀斯特环境的适应机制，为遏制喀斯特石漠化，生态恢复重建和药用植物生产利用提供理论依据。

喀斯特地貌在我国分布广泛，由于人类活动的干扰，喀斯特地区生态退化严重，该地区的生态修复迫在眉睫。立足于喀斯特地区生态修复的热点问题，采用野外测定和模拟实验相结合的方法，本项目以广豆根和岩黄连两个喀斯特地区特有药用植物为实验材料，探索分析灌木和草本药用植物对喀斯特生境的适应策略及其异同。喀斯特地区干旱，土壤贫瘠、富钙、偏碱性，针对这些问题，我们开展了一系列研究，包括两种植物在野外生境和生长状况的调查分析，取自不同喀斯特演替阶段的土壤处理、模拟干旱处理、不同pH值的基质处理、养分贫瘠处理和高钙处理下的种子发芽、个体生长、生理生化指标、生物量与次生化合物积累等的变异规律等研究，明确当地适生药用植物对喀斯特生境的适应规律。项目丰富了喀斯特地区的植物生理生态学研究，也能为喀斯特地区植被恢复提供理论参考。