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青藏高原草地生态系统服务功能的季节动态变化

于格1,2;鲁春霞1;谢高地1   

  1. 1中国科学院地理科学与资源研究所, 北京 100101;
    2中国海洋大学环境科学与工程学院, 山东青岛 266100
  • 收稿日期:2006-01-20 修回日期:2006-11-08 出版日期:2007-01-18 发布日期:2007-01-18

Seasonal dynamics of ecosystem services of grassland in Qinghai-Tibetan Plateau

YU Ge1,2; LU Chun-xia1; XIE Gao-di1   

  1. 1Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences,
    Beijing 100101, China;
    2College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100,
    Shandong, China
  • Received:2006-01-20 Revised:2006-11-08 Online:2007-01-18 Published:2007-01-18

摘要: 根据生态系统服务功能理论,利用RS和GIS技术,以生长季为时间单元,对青藏高原研究区草地生态系统服务功能的动态过程进行有效分析和评价.结果表明:提供生物量功能呈现上升—下降—上升的过程,在5月和9月分别出现两个高峰值,其中5月为最高峰值.影响该功能的主要因子为光合有效辐射值、水分状况和地下生物量的季节变化;碳蓄积和氧释放功能呈现上升—下降—上升的弱“N”型趋势;土壤养分保持功能也呈弱“N”型趋势,并在5月份出现最高值;草地保持土壤水分的功能在生长季内呈较强的阶段性变化,这主要与草地植物生长的季节性耗水变化规律有关.

关键词: 长期肥料试验, 作物产量, 水肥交互作用

Abstract: Based on the theory of ecosystem services and by using RS and GIS techniques, the ecosystem services of grassland in QinghaiTibetan Plateau were analyzed and evaluated, with growth season as time unit. The results showed that the service of supplying biomass presented an up-down-up trend, and the peaks appeared in May and September. Its main affecting factors were PAR, soil moisture condition, and underground biomass. The service of carbon accumulation and oxygen release also presented updownup trend, which was related to the supplied biomass and its formation. As for the services of holding soil nutrients and water, the former had a peak in May, while the latter presented staggered variation due to the different water consumption characters of herbages at their different growth stages.

Key words: Long term fertilization trial, Crop yield, Water nutrient interaction