种子生态与沙地植被研究组 Seed ecology and sandland vegetation research team

 

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研究组简介

种子生态与沙地植被研究组隶属于中国科学院植物研究所植被与环境变化国家重点实验室,研究组组长黄振英 研究员。研究组的主要工作是:(1)植物生理生态学:利用生理学、生物化学和分子生物学手段,重点研究植物种子的发育、休眠和萌发,幼苗发育与生长过程中对环境响应的生理生态学机理,(2)种子生态学,主要包括温带干旱生态系统的种群更新机制、种子性状的适应与进化、干旱区植物的生活史对策以及沙地植物生活史对变化环境的响应,(3)沙地植被资源开发与生态治理, 主要包括沙地植被资源开发和沙地生态治理。


研究组要闻
    叶学华老师在"沙埋和降水对植物和土壤碳的影响方面的研究"被Science of the Total Environment接受发表
    沙埋和降水增强改变了植物和土壤碳的分配:来自我国北方半干旱区草地的实验证据
    Xuehua Ye, Zhilan Liu, Shudong Zhang, Shuqin Gao, Guofang Liu, Qinguo Cui, Juan Du, Zhenying Huang, Johannes H.C. Cornelissen , Experimental sand burial and precipitation enhancement alter plant and soil carbon allocation in a semiarid steppe in north China. Science of the Total Environment (2018), doi:10.1016/j.scitotenv.2018.10.208
      植物遭受沙埋是干旱半干旱地区的常见现象,沙埋影响着植物的生长甚至于植物群落的结构;而降水格局的变化,包括降水强度和频次的变化,也是该区域群落结构和功能的主要驱动因素。在鄂尔多斯生态站开展的一个2年的野外控制实验结果表明:沙埋没有显著改变植物群落碳密度,但显著影响了地上和地下植物碳密度的分配。沙埋的这种影响因群落中植物种类和生活型不同而存在着差异。仅仅改变每次降水的强度对植物碳及其分配没有显著影响,表明降水变化对植物的影响可能更多归于降水频次的改变。沙埋和降水增强降低了土壤碳含量,特别是土壤有机碳的含量。同时沙埋和降水增强促使土壤碳由土壤表层向更深层次的土壤中转移。研究结果有助于理解降水变化背景下沙埋如何影响干旱半干旱区草地生态系统中植物和土壤碳储量及其分配,从而深入探讨变化环境中的干旱半干旱区草地生态系统结构与功能。

      Sand burial is a common phenomenon in inland semi-arid and arid areas, affecting plant growth and even plant community structure. Precipitation regime, including the variation of precipitation intensity and frequency, also drives community structure and functions in such areas. However, few studies have focused on the combined effect of sand burial and changed precipitation regime on community function, specifically its role in carbon storage. A 2-yr field experiment with factorial treatments of precipitation (control, slight enhancement and strong enhancement) and sand addition (control and 5 cm sand addition) was conducted to test the responses of plant and soil carbon content in a semi-arid typical steppe in N China. Results showed that sand burial had no significant effect on plant carbon density, but significantly changed the allocation of plant carbon from aboveground to belowground; these responses differed among species and life forms in the community. Precipitation enhancement had no significant effects on plant carbon and its allocation, perhaps because effects of precipitation on plants are due more to precipitation frequency than to precipitation intensity per event. Sand burial and precipitation enhancement decreased soil carbon, especially soil organic carbon, and promoted soil carbon to be distributed deeper down the soil profile. These findings will help to understand how sand deposition affects plant and soil carbon storage and their allocation in plant communities under a changing precipitation regime, and more generally, to understand carbon storage dynamics in early-successional sandy ecosystems in the context of global change.


常用链接
中国科学院植物研究所
植被与环境变化国家重点实验室
鄂尔多斯草地生态系统国家野外科学观测研究站