Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Desert Ecosystem Research Network in China now is consist of 26 national ecological stations, the network layout covers the eight major deserts, the four major sandy lands, the alpine region of the Qinghai-Tibet Plateau, and the karst and other special environments, and undertakes the tasks of positioning observation, monitoring and evaluation, scientific research, demonstration services and base construction of desert ecosystems in China by more than 20 years’ establishment. Relying on the network of ecological stations, large desert and Gobi comprehensive scientific investigations are organized to fill the final blank of desert scientific research in China; the Chinese scheme of comprehensive desertification control is explored, the classical models of the four typical regions are integrated, and industry and discipline standards are formulated. In the new era, the network of desert ecological stations should be based on the advantages of the industry, strengthen the network-connected cooperation, optimize the layout of the network, improve observation technology, expand the scale of research, face the major strategic needs of the country, serve regional social and economic development, answer social and scientific concerns, and provide all-round scientific and technological support for the achievement of the 2030 sustainable development goals.
Subjects: Geosciences >> Geography submitted time 2020-12-17 Cooperative journals: 《干旱区研究》
Abstract：在水分输入以小量级降水和凝结水为主导的干旱区，植物叶片吸收水分策略具有尤为重要的生态意义。以民勤地区20种荒漠植物为研究对象，测定叶片单位面积吸水量（LWUC）、含水量增加率（RW）、水分饱和亏（WSD）、比叶面积（SLA）、干物质含量（LDMC），分析植物各叶片性状的分布规律及其相互关系，并比较不同功能群植物叶片水分吸收性状的变异特征。结果表明：（1）叶片可以吸收水分，具有利用小量级降水的能力；叶片性状存在较大的种间差异。（2）叶片LWUC与LDMC呈极显著负相关（P＜0.01），RW与WSD呈极显著正相关（P＜0.01）。（3）不同生长型植物叶片LWUC、RW、WSD差异不显著（P＞0.05）。（4）不同质地植物叶片LWUC差异极显著（P＜0.01），其中，肉质多汁类型植物显著（P＜0.05）高于草质、革质类型植物，肉质多汁和叶片退化类型植物差异不显著（P＞0.05）。（5）不同叶面性状植物叶片LWUC差异不显著（P＞0.05），但覆毛类型植物叶片RW、WSD极显著（P＜0.01）高于光滑叶面平均值。总之，本研究可以加深对荒漠生态系统不同功能型植物利用水资源方式和策略的理解，增强对荒漠植物生态适应对策和荒漠植被格局变化的认识，并为其保护和恢复提供科学依据。
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