Estimating the age and population structure of encroaching shrubs in arid/semiarid grasslands using high spatial resolution remote sensing imagery
Estimating the age and population structure of encroaching shrubs in arid/semiarid grasslands using high spatial resolution remote sensing imagery
复制标题
利用高空间分辨率遥感影像估算干旱/半干旱草原入侵灌木的年龄和种群结构
DOI：
10.1016/j.rse.2018.07.025
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发表时间：
2018-10
影响因子：
13.5
通讯作者：
Chen Jin
中科院分区：
文献类型：
--
作者：
Cao Xin;Liu Yu;Liu Qixin;Cui Xihong;Chen Xuehong;Chen Jin
世界上许多干旱和半干旱的草原在很大程度上受到灌木的侵蚀。然而，灌木入侵的过程仍然知之甚少。特别是，关于入侵物种的历史数据集有限，野外样本不足。灌木年龄可以作为灌木入侵历史的重要指标，基于灌木年龄分布的种群结构可以反映入侵物种的种群动态。利用高空间分辨率遥感数据，估算了内蒙古温带干旱半干旱草原典型灌木--锦鸡儿(以下简称锦鸡儿)的年龄和种群结构。主要方法包括：(1)建立灌木年龄估计模型，考虑不同降水条件对内蒙古草原灌木冠层生长速率的影响；(2)从高铁遥感图像中识别灌木个体，并利用建立的灌木年龄估计模型估计灌木个体的年龄；(3)建立灌木年龄直方图，拟合种群结构，用负指数函数计算成活率和更新量。结果表明，该灌木年龄估测模型比单纯使用灌木树冠面积的简单统计回归方法具有更好的预测效果。此外，利用负指数函数对灌木入侵的研究为其在捕捉种群结构中的有效作用提供了佐证。结果还表明，成活率随着降雨量的增加而增加。
Many arid and semiarid grasslands around the world are suffering from shrub encroachment to a great extent. However, the process of shrub encroachment is still poorly understood. Particularly, there has been limited historical datasets and inadequate field samples about the encroachment species. Shrub age can serve as an important indicator of the shrub encroachment history; and the population structure based on the shrub age distribution can reflect the population dynamics of an encroachment species. Using a high spatial resolution (HSR) remote sensing data, this paper estimates the age and population structure of a typical shrub, theCaraganagenus (hereafter shrubs) in the temperate arid and semiarid grasslands of Inner Mongolia, China. The primary methods include: (1) building a shrub age estimation model considering different shrub crown growth rates affected by different precipitation regimes in the Inner Mongolian grassland; (2) identifying shrub individuals from multiple HSR remote sensing images and estimating the age of shrub individuals using the developed shrub age estimation model; (3) establishing a shrub age histogram, fitting the population structure, and calculating the survival rate and regeneration count using a negative exponential function. The results indicate that this shrub age estimation model performs better than a simple statistical regression using only the shrub crown area. Further, employing the negative exponential function for research on shrub encroachment provides supporting evidence of its effective role in capturing the population structure. Result also identifies that the survival rate increases with precipitation.
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DOI：
--
发表时间：
2012
期刊：
Bulletin of Soil and Water Conservation
影响因子：
--
作者：
Luo Yongming
通讯作者：
Luo Yongming
影响因子：
8.8
作者：
Eldridge DJ;Bowker MA;Maestre FT;Roger E;Reynolds JF;Whitford WG
通讯作者：
Whitford WG
影响因子：
11.6
作者：
Huenneke, LF;Anderson, JP;Schlesinger, WH
通讯作者：
Schlesinger, WH
影响因子：
4
作者：
W. Schlesinger;A. D. Abrahams;A. Parsons;J. Wainwright
通讯作者：
W. Schlesinger;A. D. Abrahams;A. Parsons;J. Wainwright
影响因子：
64.8
作者：
Kéfi, Sonia;Rietkerk, Max;de Ruiter, Peter C.
通讯作者：
de Ruiter, Peter C.