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Grassland Variation and Its Driving Factors from 2000 to 2016: A Comparative Assessment between Qinghai-Tibet Plateau and Inner Mongolia Plateau 被引量:2
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作者 Xiujuan Li Lianming Zhang +2 位作者 Guizhai Zhang huiran cui Lu Liu 《Journal of Environmental Protection》 2022年第6期411-426,共16页
The grassland of Qinghai-Tibet Plateau (QTP) and Inner Mongolia Plateau (IMP), accounting for 73.9% of the total grassland area in China, is significant to food and ecological safety. Due to climate change and irratio... The grassland of Qinghai-Tibet Plateau (QTP) and Inner Mongolia Plateau (IMP), accounting for 73.9% of the total grassland area in China, is significant to food and ecological safety. Due to climate change and irrational human activities, grasslands on the two plateaus have severely degraded over recent decades. Understanding the dynamic changes of grassland and its driving forces is necessary to make effective measurements to prevent grassland degradation. Here, we selected the net primary productivity (NPP) as an indicator to quantitatively assess the dynamic variation of grassland and the relative roles of climate change and human activities on QTP and IMP from 2000 to 2016. The results found significant spatial variability of grassland on QTP. 28.3% of the grassland experienced degradation and was mainly distributed in the southern QTP, versus 71.7% of the grassland was restored and mainly distributed in the central and northern QTP. In contrast, grassland on IMP didn’t show significant spatial variability. Most of the grassland on IMP was restored during the study period. Climate change (i.e. increased precipitation) was the dominant factor and could explain 72.8% and 84.4% of the restored grassland in QTP and IMP. Irrational human activities (i.e. overgrazing) were the main driving factors and could explain 72.9% and 100.0% of the degraded grassland on the two plateaus during the study period. Ecological restoration projects were favorable for grassland restoration on the two plateaus, and they contributed to 27.2% and 15.6% of the restored grassland in QTP and IMP, respectively. Therefore, climate changes on IMP were more favorable for grassland restoration, and human activities have a greater impact on the grassland variation on QTP. 展开更多
关键词 Grassland Degradation Driving Force Qinghai-Tibet Plateau Inner Mongolia Plateau
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航空发动机及燃气轮机叶片涂层概述 被引量:20
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作者 崔慧然 李宏然 +3 位作者 崔启政 任建伟 翟永杰 张乔 《热喷涂技术》 2019年第1期82-94,共13页
主要介绍了航空发动机和燃气轮机压气机叶片和涡轮叶片涉及涂层的分类、制备技术及主要性能指标;阐述了相关涂层的研究现状、发展趋势及存在问题,指明了后续这些涂层的重点攻关方向。
关键词 涂层 制备技术 叶片 航空发动机 燃气轮机
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