中国沙漠 ›› 2021, Vol. 41 ›› Issue (1): 145-155.DOI: 10.7522/j.issn.1000-694X.2020.00061
李传华(), 殷欢欢, 朱同斌, 周敏, 王玉涛, 孙皓, 曹红娟, 韩海燕
收稿日期:
2020-04-30
修回日期:
2020-06-29
出版日期:
2021-01-29
发布日期:
2021-01-29
作者简介:
李传华(1979—),男,湖北监利人,副教授,主要研究方向为生态遥感和GIS应用研究。E-mail: lch_nwnu@126.com
基金资助:
Chuanhua Li(), Huanhuan Yin, Tongbin Zhu, Min Zhou, Yutao Wang, Hao Sun, Hongjuan Cao, Haiyan Han
Received:
2020-04-30
Revised:
2020-06-29
Online:
2021-01-29
Published:
2021-01-29
摘要:
干旱对生态系统碳循环具有重要影响,随着气候变暖,全球干旱事件频率不断上升,研究干旱对植被净初级生产力的影响具有重要意义。提高植被净初级生产力(NPP)的时间分辨率是认识干旱对其影响机制的重要途径。基于5天NDVI遥感数据,以河西走廊为研究区,利用CASA模型估算2010—2015年5天步长尺度的NPP,将5天降水为零定义为干旱基本单元,利用标准分数来探究干旱对植被NPP的影响。结果表明:基于高时间分辨率遥感数据能有效探测干旱对NPP的影响机制,研究期间河西走廊年干旱频次6—44次,干旱对该地NPP有负效应,对5天均值的影响为-0.23 g·m-2,影响幅度为-1.93%,整体影响较小。干旱对林地NPP影响最大,下降3.70%,草地次之,荒漠最小。随着干旱持续时间的增加,NPP变化趋势呈现为先降低,然后降低趋势增加,最后趋于稳定的过程。干旱对夏季的NPP影响最大,冬季最小,秋季干旱对林地影响最大。
中图分类号:
李传华, 殷欢欢, 朱同斌, 周敏, 王玉涛, 孙皓, 曹红娟, 韩海燕. 干旱对河西走廊植被净初级生产力的影响[J]. 中国沙漠, 2021, 41(1): 145-155.
Chuanhua Li, Huanhuan Yin, Tongbin Zhu, Min Zhou, Yutao Wang, Hao Sun, Hongjuan Cao, Haiyan Han. Impact of drought on net primary productivity of vegetation in arid and semi-arid areas: a case study of Hexi Corridor[J]. Journal of Desert Research, 2021, 41(1): 145-155.
图6 河西走廊不同干旱持续时间段对不同植被类型NPP均值影响(横轴表示干旱持续的第n个5天)
Fig.6 Effects of different drought durations in Hexi Corridor of China on mean NPP of different vegetation types (horizontal axis represents the nth five days of drought duration)
图7 河西走廊干旱持续时间段平均NPP相对均值标准分数变化量(A、B、C分别表示林地、草地、荒漠)
Fig.7 Variation of average NPP relative mean standard score of drought duration in Hexi Corridor of China (A, B, C, respectively representing forest land, grassland, desert)
图8 干旱对河西走廊不同季节不同植被平均NPP相对均值标准分数变化量影响(A、B、C分别表示林地、草地、荒漠)
Fig.8 Drought changes in the average NPP relative mean standard score of different vegetations in different seasons in Hexi Corridor of China (A, B, C, respectively representing forest land, grassland, desert)
作者 | 研究区 | 研究时段 | 草地 | 林地 | 荒漠 |
---|---|---|---|---|---|
冯益明等[ | 甘肃省 | 2010年 | 43.6 | 172.3 | 11.1 |
周妍妍等[ | 疏勒河流域 | 2001—2015年 | 89.20 | 103.65 | 52.46 |
焦伟等[ | 西北干旱区 | 2000—2014年 | 252.2 | 400.2 | 51.5 |
杨冬辉[ | 石羊河流域 | 2009年 | 67.36 | 358.8 | — |
本研究 | 河西走廊 | 2010—2015年 | 80.51 | 332.47 | 22.06 |
表1 河西走廊NPP与文献值对比 (gC·m-2·a-1)
Table 1 Comparison of NPP and literature values in Hexi Corridor of China
作者 | 研究区 | 研究时段 | 草地 | 林地 | 荒漠 |
---|---|---|---|---|---|
冯益明等[ | 甘肃省 | 2010年 | 43.6 | 172.3 | 11.1 |
周妍妍等[ | 疏勒河流域 | 2001—2015年 | 89.20 | 103.65 | 52.46 |
焦伟等[ | 西北干旱区 | 2000—2014年 | 252.2 | 400.2 | 51.5 |
杨冬辉[ | 石羊河流域 | 2009年 | 67.36 | 358.8 | — |
本研究 | 河西走廊 | 2010—2015年 | 80.51 | 332.47 | 22.06 |
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