干旱区生态环境知识资源中心(Arid): 内蒙古荒漠草原植被盖度的空间异质性动态分析

Arid

	内蒙古荒漠草原植被盖度的空间异质性动态分析
其他题名	Spatial heterogeneity of vegetation coverage and its temporal dynamics in desert steppe,Inner Mongolia
	颜亮 1; 周广胜 2; 张峰 1; 隋兴华 1; 平晓燕 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2012
卷号	32 期号:13 页码:4017-4024
中文摘要	利用半方差函数分析法对内蒙古荒漠草原生长盛期(68月)的植被盖度时空变异特征的研究表明,荒漠草原生长盛期的植被盖度半方差函数形态符合指数模型,但函数曲线的形态和各参数在不同月份变化较大。其中,6月的植被盖度变程最大,达到100 m;7月植被盖度的半方差函数形态具有巢式等级结构;8月植被盖度的变程最小,仅为15 m,但空间变异程度最高。3个月的结构比介于72%85%,具有较强的空间自相关。各向异性分析表明,6月植被盖度在135°方向的半方差函数值明显低于其它3个方向(0°、45°、90°),具有各向异性特征;而7月和8月植被盖度的各向异性比接近于1,表现为各向同性。研究结果表明,荒漠草原植被盖度空间异质性的时间动态不容忽视,在野外采样或制图时,要根据时间合理控制采样范围。
英文摘要	Vegetation coverage is an important quantitative indicator of community structure and it has a range of uses,such as in the calculation of land surface evapotranspiration for assessment of vegetation condition,and in the simulation of climate or ecological dynamics.Spatial heterogeneity is an important property of an ecosystem.Research on spatial heterogeneity has both theoretical and practical significance for understanding spatial scales of ecosystem functions and processes.Semivariance is defined as half the variance of the differences between values at paired locations,and it is a useful tool to analyze spatial heterogeneity.Analysis of the semivariance has been widely used in ecological research in recent years,but studies have mainly focused on spatial heterogeneity of soil properties,and rarely on vegetation coverage.Desert steppe has unique vegetation coverage features and spatial heterogeneity exists at all spatial scales.Investigating the spatial heterogeneity of desert steppe vegetation coverage has great significance for sampling and remote sensing.During June,July and August,vegetation on the desert steppe grows rapidly,which may lead to temporal dynamics of the spatial heterogeneity in vegetation coverage.Different months may have different spatial heterogeneity features.However,there has been little research on the temporal dynamics of this spatial heterogeneity in desert steppe vegetation. In this study,we surveyed vegetation coverage in Inner Mongolia during June,July and August in a 30 m * 30 m grid,in which there were 900 1m*1m quadrats.Spatial and temporal features of the vegetation coverage were analyzed following the semivariance analysis method.The analysis was mainly done in the R statistical environment,using sp and geoR packages.Average vegetation coverage gradually increased from June to August and standard deviation had a range of 3.086.02.The results showed that an exponential model was a good description of the semivariance of the vegetation coverage,but the curve shape and semivariance parameters varied with the month.The range of vegetation coverage was the largest in June,reaching 100 m,and the smallest in August,only 15m,although it had the highest spatial variability.The semivariance in July had a nested hierarchy structure.The nugget of vegetation coverage increased from June to August,ranging from 4.28 to 7.29.The sill also increased from June to August,and the sill of August was significantly higher than those of June and July.The structural ratio of vegetation coverage in June,July and August ranged from 72% to 85%,showing a strong spatial autocorrelation.Anisotropy analysis revealed that only the semivariance in June had anisotropic characteristics,because its semi-variance at 135° direction was significantly lower than those of the other three directions(0°,45° and 90°).The anisotropy ratios of vegetation coverage in July and August were close to 1,indicating isotropy. The results of this study suggest that the spatial heterogeneity of desert steppe vegetation cover has temporal dynamics,and that the parameters of semivariogram models can vary by month.The temporal dynamics of desert steppe vegetation spatial heterogeneity should be considered when designing field sampling or mapping protocols.
中文关键词	荒漠草原 ; 空间异质性 ; 半方差函数 ; 时间动态 ; 植被盖度
英文关键词	desert steppe spatial heterogeneity semi-variance temporal dynamic vegetation coverage
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:4605479
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228462
作者单位	1.中国科学院植物研究所, 植被与环境变化国家重点实验室, 北京 100093, 中国; 2.中国气象科学研究院, 植被与环境变化国家重点实验室, 北京 100081, 中国
推荐引用方式 GB/T 7714	颜亮,周广胜,张峰,等. 内蒙古荒漠草原植被盖度的空间异质性动态分析[J]. 中国科学院植物研究所,2012,32(13):4017-4024.
APA	颜亮,周广胜,张峰,隋兴华,&平晓燕.(2012).内蒙古荒漠草原植被盖度的空间异质性动态分析.生态学报,32(13),4017-4024.
MLA	颜亮,et al."内蒙古荒漠草原植被盖度的空间异质性动态分析".生态学报 32.13(2012):4017-4024.