地理学报 ›› 2019, Vol. 74 ›› Issue (1): 63-75.doi: 10.11821/dlxb201901005

• 土地利用与生态系统服务 • 上一篇    下一篇

中国东部南北样带森林生态系统蒸腾与蒸散比值(T/ET)时空变化

任小丽1(),路倩倩2,何洪林1,3,张黎1,3,牛忠恩1,4   

  1. 1. 中国科学院地理科学与资源研究所 生态系统网络观测与模拟重点实验室,北京 100101
    2. 中科同德(北京)生态科技有限公司,北京100124
    3. 中国科学院大学资源与环境学院,北京 100190
    4. 中国科学院大学,北京 100190
  • 收稿日期:2018-01-08 出版日期:2019-01-18 发布日期:2019-01-18
  • 基金资助:
    国家重点基础研究发展计划(973计划)(2015CB954102);国家自然科学基金项目(31700417, 41571424);国家重点研发计划(2016YFC0500204)

Spatio-temporal variations of the ratio of transpiration to evapotranspiration in forest ecosystems along theNorth-South Transect of Eastern China

REN Xiaoli1(),LU Qianqian2,HE Honglin1,3,ZHANG Li1,3,NIU Zhongen1,4   

  1. 1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. Zhongke Tongde (Beijing) Ecology Technology Co., Beijing 100124, China
    3. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
    4. University of Chinese Academy of Sciences, Beijing 100190, China
  • Received:2018-01-08 Online:2019-01-18 Published:2019-01-18
  • Supported by:
    National Key Research and Development of China, No.2015 CB954102;National Natural Science Foundation of China, No.31700417, No.41571424;National Key R&D Program of China, No.2016YFC0500204

摘要:

植被蒸腾与蒸散的比值(transpiration/evapotranspiration, T/ET)表征了植被蒸腾对生态系统蒸散的贡献率,是准确量化生态系统水分利用效率的关键参数,对研究植被水分运移的生理生态机理以及碳水循环关系具有重要意义。基于站点数据验证PT-JPL模型(Priestly-Taylor Jet Propulsion Laboratory Model)模拟精度,集成遥感数据和气象栅格数据模拟中国东部南北样带森林生态系统2001-2010年T/ET,并分析其时空变化及影响因子。结果表明:① PT-JPL模型适用于中国东部森林生态系统蒸散及其组分模拟,具有较高的稳定性和可靠性;② 中国东部南北样带森林生态系统T/ET空间差异显著,整体呈南部低、北部高,主要由夏季T/ET空间格局主导;样带整体T/ET均值为0.69,2001-2010年呈显著缓慢上升趋势,增幅为0.007/yr(p < 0.01);③ T/ET季节和年际变异的主控因子不同:温度和EVI是影响T/ET季节变异的关键因子,两者均可解释T/ET季节变异的90%左右(p < 0.01);而T/ET的年际变异则主要受EVI影响,解释率为53%(p < 0.05)。

关键词: 中国东部南北样带, 森林生态系统, 蒸腾与蒸散比值(T/ET), 水分利用效率(WUE)

Abstract:

The ratio of transpiration to evapotranspiration (T/ET) is a key parameter for quantifying water use efficiency of ecosystems and understanding the interaction between ecosystem carbon uptake and water cycling in the context of global change. The estimation of T/ET has been paid increasing attention from the scientific community in recent years globally. In this paper, we used the Priestly-Taylor Jet Propulsion Laboratory Model (PT-JPL) driven by regional remote sensing data and gridded meteorological data, to simulate the T/ET in forest ecosystems along the North-South Transect of Eastern China (NSTEC) during 2001-2010, and to analyze the spatial distribution and temporal variation of T/ET, as well as the factors influencing the variation in T/ET. The results show that: (1) The PT-JPL model is suitable for the simulation of evapotranspiration and its components of forest ecosystems in Eastern China, and has relatively good stability and reliability. (2) Spatial distribution of T/ET in forest ecosystems along NSTEC was heterogeneous, i.e., T/ET was higher in the north and lower in the south, with an averaged value of 0.69; and the inter-annual variation of T/ET showed a significantly increasing trend, with an increment of 0.007/yr (p < 0.01). (3) Seasonal and inter-annual variations of T/ET had different dominant factors. Temperature and EVI can explain around 90% (p < 0.01) of the seasonal variation in T/ET, while the inter-annual variation in T/ET was mainly controlled by EVI (53%, p < 0.05).

Key words: North-South Transect of Eastern China (NSTEC), forest ecosystems, ratio of transpiration to evapotranspiration (T/ET), water use efficiency (WUE)