[1]杨 祎,王根绪*,李 阳,等.三江源区草地水土保持与防风固沙功能临界植被覆盖度时空变化分析[J].山地学报,2024,(2):143-153.[doi:10.16089/j.cnki.1008-2786.000811]
　YANG Yi,WANG Genxu*,LI Yang,et al.Spatial-Temporal Changes in the Critical Vegetation Coverage of Grasslands with Functions of Soil-Water Conservation, Wind-Breaking and Sand-Fixing in the Three-Rivers Headwater Region, China[J].Mountain Research,2024,(2):143-153.[doi:10.16089/j.cnki.1008-2786.000811]
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三江源区草地水土保持与防风固沙功能临界植被覆盖度时空变化分析
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2024年第2期
页码:
143-153
栏目:
山地环境
出版日期:
2024-06-15

文章信息/Info

Title:
Spatial-Temporal Changes in the Critical Vegetation Coverage of Grasslands with Functions of Soil-Water Conservation, Wind-Breaking and Sand-Fixing in the Three-Rivers Headwater Region, China
文章编号:
1008-2786-(2024)2-143-11
作者:
杨 祎1; 2; 王根绪1*; 李 阳1; 王志伟1; 2
(1.中国科学院、水利部成都山地灾害与环境研究所,成都 610299; 2.中国科学院大学,北京 100049)
Author(s):
YANG Yi1; 2;  WANG Genxu1*;  LI Yang1;  WANG Zhiwei1; 2
(1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610299, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China)
关键词:
临界植被盖度;  生态阈值;  生态恢复;  高寒草地;  三江源
Keywords:
critical vegetation cover;  ecological threshold;  ecological restoration;  alpine grassland;  Three-Rivers Headwater Region
分类号:
X36
DOI:
10.16089/j.cnki.1008-2786.000811
文献标志码:
A
摘要:
三江源区是中国重要的生态安全屏障,其水土保持与防风固沙功能对中国及其周边地区生态安全具有重大意义。水土保持与防风固沙功能临界植被覆盖度是三江源草地生态保护与恢复的关键指标,但其变化尚不明确。本研究利用修正通用土壤流失方程(RUSLE)和修正通用土壤风蚀方程(RWEQ)模拟了1979—2018年三江源区草地水土保持与防风固沙功能临界植被覆盖度并分析了其时空变化。结果表明:(1)近40年来,三江源区草地水土保持功能临界植被覆盖度东南高、西北低,多年平均值为12.21%±1.42%,年增长率为0.30%(P<0.01)。(2)防风固沙功能临界植被覆盖度西北高、东南低,多年平均值为39.84%±11.94%,有不显著增长趋势。(3)水土保持及防风固沙功能临界植被覆盖度西北高、东南低,多年平均值为45.38%±10.04%,年增长率为0.32%(P<0.05),变化范围为11.73%～58.56%。三江源区西北部水土保持及防风固沙功能临界植被覆盖度大于50%,西南大部分区域不超过40%。(4)水土保持及防风固沙功能临界植被覆盖度在长江源区和黄河源区东北部呈下降趋势,其中黄河源东北部下降趋势显著(P<0.01),在黄河源区南部和澜沧江源区呈显著上升趋势(P<0.01)。本研究结果可为三江源生态环境保护以及高寒草地多目标管理提供科学依据与数据支撑。
Abstract:
The Three-Rivers Headwater Region(TRHR)is a crucial ecological barrier in China and its functions of soil-water conservation, wind-breaking and sand-fixing are great significance to the ecological security of China and its neighboring areas. A Critical Vegetation Coverage(CVC)is a key indicator for measurement of the function level of soil-water conservation, wind-breaking and sand-fixing on a regional basis, and it is applicable to quantitative evaluating of ecological level of grasslands in TRHR; unfortunately, there was little information about CVC in TRHR.
In this study, Revised Universal Soil Loss Equation(RUSLE)and Revised Wind Erosion Equation(RWEQ)were used to simulate the variation of CVC in TRHR from 1979 to 2018 and then their spatial and temporal pattern were analyzed.
(1)In the past 40 years, the CVC for soil-water conservation in TRHR was higher in the southeast and lower in the northwest, with a multi-year average value of 12.21%±1.42% and a growth rate of 0.30%(P<0.01).
(2)The CVC for wind-breaking and sand-fixing was higher in the northwest and lower in the southeast, with a multi-year average value of 39.84%±11.94% and a slight growth trend.
(3)The CVC for soil-water conservation & wind-breaking and sand-fixing had a distribution of higher values in the northwest and lower values in the southeast, with a multi-year average value of 45.38%±10.04% and a growth rate of 0.32%(P<0.05), ranging from 11.73% to 58.56%. In the northwest of TRHR, the CVC for soil-water conservation & wind-breaking and sand-fixing exceeded 50%, while in most parts of the southwest, it did not exceed 40%.
(4)It found the CVC for soil-water conservation & wind-breaking and sand-fixing had a decreasing trend in the northeastern areas of the Yangtze River headwater area and the Yellow River headwater area, with a significant decrease in the northeastern Yellow River headwater area(P<0.01), whereas in the southern Yellow River headwater area as well as the Lancang River headwater area it described a significant increasing trend(P<0.01).
These results would provide a scientific basis for ecological environment protection and multi-objective management in the alpine grasslands of TRHR.

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备注/Memo

备注/Memo:
收稿日期(Received date): 2024- 01-30; 改回日期(Accepted date):2024- 04-11
基金项目(Foundation item): 国家自然科学基金联合基金项目(U2240226); 国家重点研发计划(2022YFC3201702)[Joint Fund of National Natural Science Foundation of China(U2240226); National Key Research and Development Program of China(2022YFC3201702)]
作者简介(Biography): 杨祎(1995-),女,河北邯郸人,博士研究生,主要研究方向:区域可持续发展。[YANG Yi(1995-), female, born in Handan, Hebei province, Ph.D. candidate, research on regional sustainable development] E-mail: yangyi956@imde.ac.cn
*通讯作者(Corresponding author): 王根绪(1965-),男,甘肃天水人,博士,研究员,主要研究方向:生态水文学。[WANG Genxu(1965-), male, born in Tianshui, Gansu province, Ph.D., professor, research on ecohydrology] E-mail: wanggx@imde.ac.cn
更新日期/Last Update: 2024-03-30