Remote Sensing Evaluation of Vegetation Restoration and Analysis of Driving Factors of Vegetation Change in the Desert Section of Hotan River

doi:10.6048/j.issn.1001-4330.2022.08.026

Abstract

Abstract:

【Objective】 To explore the vegetation changes of Hotan River desert section since the ecological water transport, evaluate the governance effect in the desert section, determine the driving factors of vegetation changes in the hope of providing guidance for the ecological restoration of Hotan River desert section. 【Method】 The NDVI values of vegetation response characteristics since ecological water diversion in the desert section of Hotan River were systematically studied by using the impact data of satellite remote sensing and field investigation data.【Result】 Since the ecological water conveyance in 2002, the NDVI value of Hotan River desert section increased as a whole, with an average increase of 37.24%. The ecological water diversion had a significant effect on the vegetation within the range of 1~2.75 km, and the NDVI value increased first, then decreased, and finally increased. The vegetation in the whole desert section was good in the upper and lower reaches, but weak in the middle section. The area with fragile vegetation was located 15 ~115 km downstream of the confluence of the two rivers. There was a positive correlation between NDVI value and temperature and water consumption in the desert section.【Conclusion】 The ecological water conveyance of Hotan River promotes the restoration of ecological vegetation on both banks of the river, and the trend of vegetation improvement is obvious. The change of NDVI value in desert section is closely related to temperature and water consumption in river reach. The increase of temperature and water consumption（ecological water diversion） in the upper and lower reaches of the desert section is conducive to the vegetation improvement in the River.

Key words: Hotan river; ecological water conveying; remote-sensing monitoring; vegetation restoration; NDVI

摘要：

【目的】结合和田河沙漠段生态输水以来植被变化情况,评价和田河沙漠段治理成效,研究植被变化的驱动因素,为和田河沙漠段生态修复提供指导。【方法】运用卫星遥感影像数据和野外调查资料,对和田河沙漠段生态输水以来植被响应特征指标NDVI值进行系统研究分析。【结果】2002年生态输水以来,和田河沙漠段NDVI值整体提高,平均增幅达37.24%。生态输水对河岸1~2.75 km范围内植被影响显著,年际间NDVI值呈先升高后降低又升高趋势。整个沙漠段植被呈现上、下游较好,中游较差的特点,两河汇合口下游15~115 km为植被脆弱区域。沙漠段NDVI值变化与气温和河段耗水均呈正相关关系。【结论】和田河生态输水促进河道两岸植被的生态恢复,植被变好趋势明显。沙漠段NDVI值变化与气温和河段耗水密切相关,温度升高和上、下游断面水量损耗（生态引水）增加,均有助于和田河沙漠段植被改善。

关键词: 和田河, 生态输水, 遥感监测, 植被恢复, NDVI

CLC Number:

S-03

Cairenjiapu , CAO Biao, BAI Yungang, LIU Xuhui, YU Qiying, LIU Minjie. Remote Sensing Evaluation of Vegetation Restoration and Analysis of Driving Factors of Vegetation Change in the Desert Section of Hotan River[J]. Xinjiang Agricultural Sciences, 2022, 59(8): 2041-2050.

才仁加甫, 曹彪, 白云岗, 刘旭辉, 余其鹰, 刘敏杰. 和田河沙漠段生态输水植被恢复遥感评价和植被变化驱动因素分析[J]. 新疆农业科学, 2022, 59(8): 2041-2050.

Figures/Tables 17

References 21

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编号 Number	传感器类型 Sensor type	年份 Year	影像获取时间（月/日） Image acquisition time（month/day）	空间分辨率 Spatial resolution（m）
1	Landsat 8 OLI	1996	9/19、10/5、10/21	30
2	Landsat 8 OLI	2000	9/22、10/8、10/24	30
3	Landsat 8 OLI	2006	9/23、10/9、10/25	30
4	Landsat 8 OLI	2009	9/15、10/1、10/17	30
5	Landsat 8 OLI	2013	9/18、10/4、10/20	30
6	Landsat 8 OLI	2015	9/15、10/1、10/17	30
7	Landsat 8 OLI	2018	9/16、10/2、10/18	30
8	Landsat 8 OLI	2020	9/21、10/7、10/23	30

编号 Number	传感器类型 Sensor type	年份 Year	影像获取时间（月/日） Image acquisition time（month/day）	空间分辨率 Spatial resolution（m）
1	Landsat 8 OLI	1996	9/19、10/5、10/21	30
2	Landsat 8 OLI	2000	9/22、10/8、10/24	30
3	Landsat 8 OLI	2006	9/23、10/9、10/25	30
4	Landsat 8 OLI	2009	9/15、10/1、10/17	30
5	Landsat 8 OLI	2013	9/18、10/4、10/20	30
6	Landsat 8 OLI	2015	9/15、10/1、10/17	30
7	Landsat 8 OLI	2018	9/16、10/2、10/18	30
8	Landsat 8 OLI	2020	9/21、10/7、10/23	30

名称 Name			植被调查断面 Vegetation survey section
名称 Name	艾格利牙断面	吐直鲁克断面	阔什拉什断面	阔什拉什 +15 km断面	阔什拉什 +65 km断面	阔什拉什 +115 km断面	阔什拉什 +165 km断面	阔什拉什 +220 km断面	阔什拉什 +260 km断面
流程距离 Distance（km）	-45	-30	8	23	73	123	173	228	268
所在河流 River	玉龙喀什河	喀拉喀什河	和田河	和田河	和田河	和田河	和田河	和田河	和田河

名称 Name			植被调查断面 Vegetation survey section
名称 Name	艾格利牙断面	吐直鲁克断面	阔什拉什断面	阔什拉什 +15 km断面	阔什拉什 +65 km断面	阔什拉什 +115 km断面	阔什拉什 +165 km断面	阔什拉什 +220 km断面	阔什拉什 +260 km断面
流程距离 Distance（km）	-45	-30	8	23	73	123	173	228	268
所在河流 River	玉龙喀什河	喀拉喀什河	和田河	和田河	和田河	和田河	和田河	和田河	和田河

级别 Level	NDVI 范围 NDVI scope	类型 Type	植被分布特点 Vegetation distribution characteristics
一级	0~0.056	沙漠	植被极稀疏甚至没有
二级	0.056~0.078	低植被覆盖	域内零星分布乔木或灌木
三级	0.078~0.106	中植被覆盖	域内较多分布乔木或灌木,少量草本植物
四级	>0.106	高植被覆盖	植被较好,乔木、灌木、草本相间分布