Effects of Precipitation on the Vegetation Coverage in the Northern Tibetan Plateau from 2000 to 2016

doi:10.11733/j.issn.1007-0435.2022.03.025

Acta Agrestia Sinica ›› 2022, Vol. 30 ›› Issue (3): 721-730.DOI: 10.11733/j.issn.1007-0435.2022.03.025

Effects of Precipitation on the Vegetation Coverage in the Northern Tibetan Plateau from 2000 to 2016

CAO Ya-nan¹, SUN Ming-xiang¹, CHEN Meng-ran¹, HE Yong-tao^2,3, SONG Hong-li¹

1. Hebei University of Engineering, School of Earth Science and Engineering, Handan, Hebei Province 056038, China;
2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Key Laboratory of Ecosystem Network Observation and Modelling, Lhasa Plateau Ecosystem Research Station, Beijing 100101, China;
3. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2021-08-16 Revised:2021-10-18 Published:2022-03-30

2000—2016年藏北高原降水对植被覆盖的影响

曹亚楠¹, 孙明翔¹, 陈梦冉¹, 何永涛^2,3, 宋宏利¹

1. 河北工程大学, 地球科学与工程学院, 河北邯郸 056038;
2. 中国科学院地理科学与资源研究所, 生态网络观测与模拟重点实验室, 拉萨高原生态试验站, 北京 100101;
3. 中国科学院大学资源与环境学院, 北京 100049

通讯作者: 何永涛,E-mail:heyt@igsnrr.ac.cn
作者简介:曹亚楠(1990-),女,汉族,河北邯郸人,讲师,博士,主要从事全球变化生态学研究,E-mail:yanan1990321@163.com
基金资助:
中国科学院战略性先导科技专项(A类)(编号XDA20010201，XDA19050502)；第二次青藏高原综合科学考察研究项目(编号2019QZKK1006)；河北工程大学创新基金项目(编号SJ2101003039)共同资助

Abstract

Abstract: It is of great significance for maintaining the stability of the local ecosystem and regional sustainable development to explore the effect of precipitation change on vegetation growth in the northern Tibetan Plateau. In this study,we used MODIS-NDVI remote sensing data from 2000 to 2016 to analyze the spatiotemporal changes of vegetation coverage in the northern Tibetan Plateau,and calculated growing season total precipitation,non-growing season total precipitation,precipitation concentration index (PCI),and precipitation centroid (PC) by meteorological data to illustrate the spatiotemporal changes of precipitation pattern in the northern Tibetan Plateau. On this basis,the influence of precipitation variation on the vegetation coverage was discussed. The results showed that the vegetation coverage increased from west to east in the northern Tibetan Plateau. The vegetation coverage decreased in the central and southeastern regions,but increased in the northern and western regions. The inter-annual fluctuation of precipitation in the northern Tibetan Plateau was great. Except for the eastern and southwestern edge regions,precipitation in other regions was not evenly distributed throughout the year,with the significant seasonal distribution. Precipitation was mainly concentrated in the growing season,and the precipitation center was roughly distributed between June and August,with a tendency of delay in the central and southern regions. In the northern Tibetan Plateau,total precipitation in the growing season was the dominant factor affecting vegetation coverage,which had a significant positive correlation with vegetation coverage,while non-growing season total precipitation,PC,and PCI had no significant effect on vegetation coverage.

Key words: Northern Tibetan Plateau, Precipitation variability, Vegetation coverage, NDVI, Precipitation concentration index

摘要： 探讨降水变化对藏北高原植被生长状况的影响，对于维护当地生态系统稳定以及区域可持续发展来说具有重要意义。本研究利用2000—2016年MODIS-NDVI遥感数据分析藏北高原植被覆盖的时空变化状况，并利用气象数据计算生长季降水、非生长季降水、降水集度(Precipitation concentrated index,PCI)和降水重心(Precipitation centroid,PC)指数，说明藏北高原降水格局的时空变化，在此基础上，探讨降水变化对植被覆盖状况的影响。结果表明：藏北高原的植被覆盖度呈由西向东递增的趋势，中部和东南部地区的植被覆盖度下降，而北部和西部地区植被覆盖度呈增加趋势；藏北高原降水年际波动较大，除藏北高原东部和西南边缘地区外，其余地区降水常年分布不均匀，降水主要集中在生长季，降水重心大致分布在6—8月间，且中南部有推迟趋势；藏北地区植被覆盖度主要受生长季降水的影响，生长季降水与植被覆盖度呈显著正相关，而非生长季降水、PC和PCI对植被覆盖度的影响并不显著。

关键词: 藏北高原, 降水变化, 植被覆盖度, 归一化植被指数, 降水集度

CLC Number:

S812

CAO Ya-nan, SUN Ming-xiang, CHEN Meng-ran, HE Yong-tao, SONG Hong-li. Effects of Precipitation on the Vegetation Coverage in the Northern Tibetan Plateau from 2000 to 2016[J]. Acta Agrestia Sinica, 2022, 30(3): 721-730.

曹亚楠, 孙明翔, 陈梦冉, 何永涛, 宋宏利. 2000—2016年藏北高原降水对植被覆盖的影响[J]. 草地学报, 2022, 30(3): 721-730.

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Effects of Precipitation on the Vegetation Coverage in the Northern Tibetan Plateau from 2000 to 2016

2000—2016年藏北高原降水对植被覆盖的影响

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