Two important indicators with potential to identify Caragana microphylla in xilin gol grassland from temporal MODIS data
Two important indicators with potential to identify Caragana microphylla in xilin gol grassland from temporal MODIS data
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利用MODIS时态数据识别锡林郭勒草原小叶锦鸡儿的两个重要指标
DOI：
10.1016/j.ecolind.2013.06.014
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发表时间：
2013-11
影响因子：
6.9
通讯作者：
Xiao-lin Zhu
中科院分区：
文献类型：
--
作者：
Jin Chen;Xue-hong Chen;Xin Cao;Xiao-lin Zhu
干旱半干旱环境中灌木的扩展给地球系统带来了严重的净初级生产力、养分循环和全球碳平衡问题。小叶锦鸡儿是分布于中国锡林郭勒草原的一种灌木物种，正在向草原扩展和退化。本论文从中分辨率成像光谱仪(MODIS)的数据中提出了两个重要的指标，这将有助于潜在地区分C。周围草种的小叶：丰、枯年最大(DM)NDVI/EVI和累积(DA)NDVI/EVI之差。这两个指标是基于木本植物和草本植物的相对抗旱性而制定的。利用在锡林郭勒草原采集的野外调查数据进行精度评估。结果表明，所提出的指标对识别C是有效的。总体准确率为81.67%，卡帕系数为0.6300。由于混合像素效应，当覆盖FC时，指示器的性能不太理想。小叶门处于低水平。此外，如果能够选择降水量变化较大的两年，拟议的指标将更加有效。此外，预计开发的指标对世界各地其他类似的抗旱灌木也很敏感。
Shrub expansion in arid and semi-arid environment leads to serious issues to earth system regarding net primary production, nutrient cycling, and global carbon balance.Caragana microphyllais a shrub species distributed in Xilin Gol grassland, China, which is expanding into and degrading grassland areas. The current paper proposed two important indicators from Moderate Resolution Imaging Spectroradiometer (MODIS) data that will help potentially distinguishC. microphyllafrom grass species around it: Difference of Maximum (DM) NDVI/EVI and Difference of Accumulated (DA) NDVI/EVI between wet and dry years. The two indicators were developed based on relative drought resistance of woody vs. grass species. Accuracy assessment was performed using the field survey data collected in Xilin Gol grassland. The results demonstrated that the proposed indicators were effective for identifyingC. microphylla, with the overall accuracy of 81.67% and Kappa coefficient of 0.6300. Due to the mixed pixel effect, the performance of the indicators was less desirable when the coverage ofC. microphyllawas on low levels. In addition, the proposed indicators would be more effective if two years with significant variation in precipitation could be selected. Furthermore, the indicators developed are anticipated to be sensitive to other similar drought resistant shrubs around the world.
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影响因子：
5.7
作者：
F. Jeltsch;S. Milton;W. Dean;N. Rooyen
通讯作者：
F. Jeltsch;S. Milton;W. Dean;N. Rooyen
影响因子：
13.5
作者：
Huete, AR;Liu, HQ;vanLeeuwen, W
通讯作者：
vanLeeuwen, W
DOI：
--
发表时间：
2001
期刊：
--
影响因子：
--
作者：
Yongfu Wei
通讯作者：
Yongfu Wei
影响因子：
13.5
作者：
TUCKER, CJ
通讯作者：
TUCKER, CJ
影响因子：
15
作者：
W. K. Luaenroth;I. Burke;M. Gutmann
通讯作者：
W. K. Luaenroth;I. Burke;M. Gutmann