生物扰动条件下稻田水层-底栖界面耦合生态动力学研究

Through field observation, in situ sampling, and lab simulation experiment, ecodynamic studies on pelagic-benthic interface coupling under bioturbation conditions will be conducted in paddy field ecosystem, the coupling mechanism of pelagic system and benthic system, the bioturbation mechanism, the changing pattern, and the influencing factors will be explored. The major contents include the bioturbation effects of benthic animals on vertical distribution of sediment paticle, sediment resuspension, biogenic element cycling in pelagic-benthic interface, comparison of bioturbation effects of various benthic animals(benthic animals, benthic molluscs, benthic oligochaeta), response of pelagic-benthic interface coupling to different cultivation conditions, etc. This project will introduce bioturbation mechanism and fluorescent powder tracer technic into quantitative studies on pelagic-benthic interface coupling in paddy field ecosystem, seek new technologies and new methods for pelagic-benthic interface coupling studies in wetland ecosystem, reveal more deeply the key ecological process in pelagic-benthic interface, provide basic parameters and scientific evidence for nutrient regulation in paddy field, control of agricultural non-point pollution, ecological modelling, and low-carbon agriculture.

以稻田生态系统为对象，通过野外现场观测、原位采样与实验室模拟相结合，开展生物扰动条件下水层-底栖系统界面耦合生态动力学研究，探讨水层系统与底栖系统的耦合机理、生物扰动机制、变化规律及影响因素。主要内容包括底栖动物对沉积物颗粒垂直分布、沉积物再悬浮、水层-底栖界面生源要素循环的扰动效应，不同类别底栖动物（底栖鱼类、底栖软体动物、底栖寡毛动物）扰动效应的比较，沉积物-水界面耦合过程对不同培养条件的响应等。将生物扰动机制和荧光粉示踪技术引入稻田生态系统水层-底栖界面耦合的定量化研究，寻求湿地水层-底栖界面耦合研究的新技术和新方法，更加深入地了解水层-底栖界面的关键生态过程，为稻田养分调控、农业面源污染减排、生态建模和低碳农业等提供基本参量和科学依据。

在完成项目计划书规定的研究内容的基础上，增加了“底栖动物对稻田沉积物物理性状的扰动效应”、“底栖动物对稻田沉积物生物学性质的扰动效应”等研究内容。发表标注本项目资助的论文3篇，获得省级奖励2项，获得省级荣誉称号1人，培养硕士研究生2人。