草地学报

草地学报 ›› 2019, Vol. 27 ›› Issue (6): 1685-1693.DOI: 10.11733/j.issn.1007-0435.2019.06.027

• 研究论文 • 上一篇    下一篇

2001—2016年内蒙古植被物候变化及其对生产力的影响

乌日汗1, 红雨1, 包刚2,3   

  1. 1. 内蒙古师范大学生命科学与技术学院, 内蒙古 呼和浩特 010022;
    2. 内蒙古师范大学地理科学学院, 内蒙古 呼和浩特 010022;
    3. 内蒙古师范大学内蒙古自治区遥感与地理信息系统重点实验室, 内蒙古 呼和浩特 010022
  • 收稿日期:2019-05-13 修回日期:2019-09-11 出版日期:2019-12-15 发布日期:2019-12-31
  • 通讯作者: 红雨,E-mail:hongyu@imnu.edu.cn
  • 作者简介:乌日汗(1995-),女,内蒙古通辽人,硕士研究生,主要从事民族生态学和恢复生态学研究,E-mail:1920697660@qq.com
  • 基金资助:
    内蒙古自治区高等学校青年科技领军人才专项基金（NJYT-15-A06；NJYT-18-A11）资助

The Change of Vegetation Phenology and its Impacts on Vegetation Productivity in Inner Mongolia during 2001-2016

WU Ri-han1, HONG Yu1, BAO Gang2,3   

  1. 1. College of Life Science and Technology, Inner Mongolia Normal University, Hohhot, Inner Mongolia 010022, China;
    2. College of Geographical Science, Inner Mongolia Normal University, Hohhot, Inner Mongolia 010022, China;
    3. Inner Mongolia Key Laboratory of Remote Sensing and Geographic Information Systems, Inner Mongolia Normal University, Hohhot, Inner Mongolia 010022, China
  • Received:2019-05-13 Revised:2019-09-11 Online:2019-12-15 Published:2019-12-31

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摘要： 基于2001-2016年的中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer，MODIS）归一化植被指数（Normalized Difference Vegetation Index，NDVI）数据，本研究采用累计NDVI的Logistic曲线曲率极值法识别内蒙古植被返青期、枯黄期、生长季长度及其变化趋势，并分析植被物候变化对生产力的影响。结果表明：森林生态区和荒漠生态区的返青期比中部草原生态区要早，其平均值分别为第120，119和128天；森林和荒漠生态区的枯黄期比草原生态区要晚，平均值分别为第275，276和269天；受返青期和枯黄期的影响，森林和荒漠生态区植被生长季长度比草原生态区要长，分别为155，157和141天。在16年间研究区植被生产力以增加为主，其中森林和荒漠生态区的植被生产力呈显著增加的趋势；返青期和枯黄期提前趋势的面积略大于推迟趋势的面积，但大多地区的趋势并不显著；草原生态区生长季长度以缩短为主，而森林和荒漠生态区的生长季长度以延长为主。物候参数与NDVI之间的相关分析表明，返青期的提前和枯黄期的推迟（即生长季的延长）并不一定增加所有生态系统的植被年生产力。季节尺度分析表明：返青期的提前/推迟将增加/降低春季植被生产力，而枯黄期提前/推迟将降低/增加秋季植被生产力。

关键词: 内蒙古, 返青期, 枯黄期, 生长季长度, 植被生产力

Abstract: Based on the MODIS NDVI data from 2001 to 2016,the vegetation greening day,browning day and length of growing season and its trend in Inner Mongolia was identified using cumulative NDVI based logistic model and the impacts of phenology on vegetation productivity were analyzed at pixel scale. Results showed that the ecosystems of forest and desert had earlier greening day than that of grassland ecosystems,with the day of 120,119 and 128,respectively. In contrast,the ecosystems of forest and desert had later browning day of than that of grassland ecosystems,with the day of 275,276 and 269,respectively. Influenced by the greening and browning day,the ecosystems of forest and desert had longer growing days than that of grassland ecosystems,with the day of 155,157 and 141,respectively. During the 16 year observation period,vegetation productivity on the study area increased,with significant increase of forest and desert ecosystems. The area of both start and end of growing season with advancing trend is larger than that with delaying trend,but the trend of most of the area is not statistically significant. The length of growing season (LOS) in grasslands ecosystems shortened,while LOS in forest and desert lengthened. Correlation analysis between phenology and NDVI indicates that the advancing trend of greening day and delaying trend of browning day could not increase the vegetation productivity for all ecosystems. The reason is that the vegetation summer productivity accounts for larger number of annual productivity,which determines the annual productivity trend. However,seasonal scale analysis shows that the advancing/delaying trend of greening day could increase/decrease spring productivity and delaying/advancing trend of browning day could decrease/increase autumn productivity.

Key words: Inner Mongolia, Greening day, Browning day, Length of growing season, Vegetation productivity

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