YAN Junjie,LIU Haijun,ZHAO Yu,et al.Spatiotemporal Dynamics of Grassland Net Primary Productivity in Ili River Valley from 2000 to 2015[J].Research of Soil and Water Conservation,2018,25(05):390-396.
2000-2015年新疆伊犁河谷草地NPP时空变化特征
- Title:
- Spatiotemporal Dynamics of Grassland Net Primary Productivity in Ili River Valley from 2000 to 2015
- Keywords:
- spatioemporal dynamics of NPP; Modis data; grassland; Ili River Valley
- 分类号:
- Q948
- 摘要:
- 以伊犁河谷为研究区，基于Modis NPP遥感数据，并借助于GIS空间分析技术及Mann-Kendall检验和Theil-Sen median趋势分析等方法，对伊犁河谷2000-2015年草地NPP的时空变化进行了分析。结果表明：（1）伊犁河谷全区草地NPP多年平均值为272.99 g C/（m2·a），大部分草地NPP值介于200~400 g C/（m2·a），主要分布于河谷内的中山、高山及昭苏盆地等区域，各草地类型中山地草甸分布面积最广，NPP平均值也最大；（2）草地NPP总体呈非显著减少趋势，平均减小速率为0.94 g C/（m2·a），空间上，全区73.94%草地的NPP出现不同程度的减少，减小速率主要介于1.0~5.0 g C/（m2·a），类型主要属于山地草甸、温性草原及高寒草甸；（3）伊犁河谷草地NPP减小速率总体随NPP的增加而逐步增大，但NPP值介于300~400 g C/（m2·a）的平均减小速率最大；（4）海拔分异上，1 000~2 000 m海拔带内NPP减少最为明显，而NPP有所增加的草地主要分布于2 000~3 000 m海拔带内。
- Abstract:
- Based on the Modis NPP remote sensing data, we analyzed the spatiotemporal dynamics of grassland NPP from 2000 to 2015 in Ili River Valley by means of GIS spatial analysis technology, Mann-Kendall test and Theil-Sen median trend analysis. The results showed that:(1) the annual grassland NPP of the whole Ili River Valley was 272.99 g C/(m2·a); NPP of most part of the grassland in Ili River Valley was between 200~400 g C/(m2·a), and they mainly distributed at Zhaosu Basin, and the middle and high mountains around the valley; mountain meadow was the most widely distributed among all grassland types, and its average NPP was the highest; (2) NPP of grassland in Ili River Valley showed a non-significant decreasing trend in general, and the average decrease rate was 0.94 g C/(m2·a); NPP of 73.94% grassland in the whole area decreased, and the decrease rate was mainly between 1.0~5.0 g C/(m2·a); the types were mainly mountain meadow, warm steppe and alpine meadow; (3) generally speaking, the decrease rate of the grassland NPP in Ili River Valley increased gradually with the increase of NPP, and those ranging between 300~400 g C/(m2·a) had the largest average decrease rate; (4) for the variation of the increase rate of grassland NPP along the elevation, the decrease of NPP in the 1 000~2 000 m elevation was the most obvious, and grassland with increasing NPP mostly distributed at the elevation of 2 000~3 000 m.
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备注/Memo
收稿日期:2017-12-07;改回日期:2017-12-18。
基金项目:伊犁师范学院植物生态学重点学科科研资助项目（YLUPE201801）
作者简介:闫俊杰(1984-),男,河南林州市人,在读博士,讲师,主要从事遥感生态应用相关研究。E-mail:yan3550@sina.com