Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (1): 166-173.DOI: 10.11733/j.issn.1007-0435.2021.01.020

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Characteristics of Grassland Evapotranspiration in Semi-arid Area and its Responses to Meteorological Factors and Vegetation

HAN Dian-chen1, ZHANG Fang-min1, CHEN Ji-quan2, LI Yun-peng3, LU Qi4   

  1. 1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing, Jiangsu Province 210044, China;
    2. Department of Geography, Environment and Spatial Science and Center for Global Change and Earth Observation, Michigan State University, East Lansing, Michigan MI 48825, USA;
    3. Ecological and Agricultural Meteorological Center of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia Autonomous Region 010051, China;
    4. Desertification Research Institute/Desert Forestry Experimental Center, Chinese Academy of Forestry Sciences, Beijing 100091, China
  • Received:2020-07-27 Revised:2020-09-10 Published:2021-01-08

半干旱区草地站蒸散特征及其对气象因子和植被的响应

韩典辰1, 张方敏1, 陈吉泉2, 李云鹏3, 卢琦4   

  1. 1. 南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏 南京 210044;
    2. 密歇根州立大学地理环境空间科学系全球变化观测中心, 密歇根 东兰辛 MI48825;
    3. 内蒙古自治区生态与农业气象中心, 内蒙古 呼和浩特 010051;
    4. 中国林科院荒漠化研究所/沙漠林业实验中心, 北京 100091
  • 通讯作者: 张方敏
  • 作者简介:韩典辰(1997-),男,汉族,硕士研究生,主要从事生态气象研究,E-mail:20191208013@nuist.edu.cn
  • 基金资助:
    科技部重大研发计划(2018YFC1506606);江苏省优秀青年基金项目(BK20170102)资助

Abstract: Water is an important factor restricting the ecological development of semi-arid areas,and evapotranspiration (ET) is an important process of land water consumption. Based on the multi-year water flux,meteorological and vegetation data of the Duolun and Xilinhot grassland sites in semi-arid area of Inner Mongolia,this paper analyzed the ET change characteristics of the two typical grasslands and their responses to vegetation growth and main meteorological factors,which can provide scientific guide for the continuous development and protection of semi-arid grasslands. Results showed that the average annual ET of Duolun and Xilinhot sites was 417.15 mm and 440.20 mm and ET in the growing season accounted for 75.75% and 72.38%,respectively. The change course of ET during the year was unimodal,which was significantly positively correlated with energy factors,water factors and vegetation condition (P<0.01). Path analysis further showed that the monthly ET changes of the two sites were mainly driven by the direct effect of net solar radiation,and then influenced by the indirect effects of leaf area index,precipitation and soil moisture.

Key words: Evapotranspiration, Grassland, Path analysis, Semi-arid area

摘要: 水分是制约半干旱区生态发展的重要因素,而蒸散(Evapotranspiration,ET)是地表水分消耗的重要过程。本文基于内蒙古半干旱区多伦和锡林浩特草地站多年通量、气象和植被数据,分析两个典型草地ET变化特征及其对植被和主要气象因子的响应,为半干旱区草地资源的持续开发与保护提供参考。结果表明:多伦站和锡林浩特站多年均ET总量分别为417.15 mm和440.20 mm,其中生长季ET分别占年总量的75.75%和72.38%。两站ET年内变化均呈单峰型,和热量因子、水分因子与植被状况均呈显著性正相关关系(P<0.01)。通径分析表明,两站ET变化均主要受到太阳净辐射直接作用的驱动,其次受到叶面积指数、降水和土壤含水量的间接影响。

关键词: 蒸散, 草地, 通径分析, 半干旱地区

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