青藏高原草地物候动态及其对驱动因子的响应

被引：3

作者：

吉珍霞 ^{[1
]}

裴婷婷 ^{[1
,2
]}

陈英 ^{[1
,2
]}

侯青青 ^{[3
]}

谢保鹏 ^{[2
]}

吴华武 ^{[4
,5
]}

机构：

[1] 甘肃农业大学资源与环境学院

[2] 甘肃农业大学管理学院

[3] 甘肃农业大学草业学院

[4] 草业生态系统教育部重点实验室/甘肃农业大学

[5] 中国科学院南京地理与湖泊研究所

来源：

草业科学 | 2023年 / 01期

关键词：

草地物候; 地理探测器; 地理加权回归模型; 动态阈值法; 风速; RX5day; 青藏高原;

D O I：

暂无

中图分类号：

S812 [草地学、草原学];

学科分类号：

090503 ; 0909 ;

摘要：

植被物候动态是多重因子影响的结果，尤其在对外界扰动响应敏感的青藏高原草地生态系统。本研究利用2000-2020年MODIS 16 d合成的归一化植被指数(normalization difference vegetation index, NDVI)数据，选用动态阈值法提取了青藏高原逐年的植被物候期，探究了青藏高原草地物候动态变化及其对驱动因子的响应。结果表明：1) 2000-2020年青藏高原草地生长季始期(start of the growing season, SOS)从西北向东南呈提前趋势，每年提前约0.19 d；草地生长季末期(end of the growing season, EOS)整体呈推迟趋势，每年推迟约0.19 d；草地生长季长度(length of the growing season, LOS)由西北向东南逐渐增长。2)风速和连续5 d最大降雨(yearly maximum five-day precipitation, RX5day)是影响草地LOS的主要因素，且因子间两两交互作用要强于单个因子对植被物候的影响，尤其表现在RX5day与温度和风速与温度之间的交互。3)草地LOS与风速和RX5day的回归系数有明显的空间异质性。藏北高原草地LOS随风速增大而变长，随RX5day增大而变短。青海高原和藏南谷地的草地LOS随风速增大而变短。川藏高山峡谷区草地LOS随RX5day增大而变长。综上，本研究可为研究区内生态系统保护和畜牧业的发展提供一定科学依据。

引用

页码：4 / 14

页数：11

共 31 条

[21] Snow cover phenology affects alpine vegetation growth dynamics on the Tibetan Plateau: Satellite observed evidence, impacts of different biomes, and climate drivers[J] . Xiaoyue Wang,Chaoyang Wu,Dailiang Peng,Alemu Gonsamo,Zhengjia Liu.Agricultural and Forest Meteorology . 2018
[22] Interactions between vegetation, atmospheric turbulence and clouds under a wide range of background wind conditions[J] . M. Sikma,H.G. Ouwersloot,X. Pedruzo-Bagazgoitia,C.C. van Heerwaarden,J. Vilà-Guerau de Arellano.Agricultural and Forest Meteorology . 2018
[23] Finding water scarcity amid abundance using human-natural system models
Jaeger, William K.
Amos, Adell
Bigelow, Daniel P.
Chang, Heejun
Conklin, David R.
Haggerty, Roy
Langpap, Christian
Moore, Kathleen
Mote, Philip W.
Nolin, Anne W.
Plantinga, Andrew J.
Schwartz, Cynthia L.
Tullos, Desiree
Turner, David P.
[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2017, 114 (45) : 11884 - 11889
[24] Vegetation patterns generated by a wind driven sand-vegetation system in arid and semi-arid areas[J] . Feifan Zhang,Huayong Zhang,Matthew R. Evans,Tousheng Huang.Ecological Complexity . 2017
[25] PHENOLOGY Spring greening in a warming world
Keenan, Trevor F.
[J]. NATURE, 2015, 526 (7571) : 48 - 49
[26] Increasing altitudinal gradient of spring vegetation phenology during the last decade on the Qinghai–Tibetan Plateau[J] . Miaogen Shen,Gengxin Zhang,Nan Cong,Shiping Wang,Weidong Kong,Shilong Piao.Agricultural and Forest Meteorology . 2014
[27] Increased water-use efficiency during the 20th century did not translate into enhanced tree growth
Penuelas, Josep
Canadell, Josep G.
Ogaya, Roma
[J]. GLOBAL ECOLOGY AND BIOGEOGRAPHY, 2011, 20 (04): : 597 - 608
[28] Spring phenology was not consistently related to winter warming on the Tibetan Plateau
Shen, Miaogen
[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2011, 108 (19) : E91 - E92
[29] Diurnal, seasonal and annual variation in net ecosystem CO＜sub＞2＜/sub＞ exchange of an alpine shrubland on Qinghai‐Tibetan plateau[J] . LIANG ZHAO,YINGNIAN LI,SHIXIAO XU,HUAKUN ZHOU,SONG GU,GUIRUI YU,XINQUAN ZHAO.Global Change Biology . 2006 (10)
[30] Climate controls on vegetation phenological patterns in northern mid- and high latitudes inferred from MODIS data
Zhang, XY
Friedl, MA
Schaaf, CB
Strahler, AH
[J]. GLOBAL CHANGE BIOLOGY, 2004, 10 (07) : 1133 - 1145

← 1 2 3 4 →