Spatio-temporal variation of net primary productivity in a rapidly expanding artificial woodland area based on remote-sensing data

IF 0.8 4区 社会学 Q3 GEOGRAPHY
Qi Yi, Yuting Gao, Hongrong Du, Junxu Chen, L. Yang, Hongling Zhao
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引用次数: 2

Abstract

The expansion of artificial woodlands in China has contributed significantly to regional land-cover changes and changes in the regional net primary productivity (NPP). This study used Ximeng County in the Yunnan Province as a case study to investigate the overall changes, associated amplitude, and spatio-temporal distribution of NPP from 2000–2015.The Carnegie-Ames-Stanford approach was used in the rapidly expanding artificial woodland area based on MODIS-NDVI data, meteorological data, and Landsat 5 TM data to calculate the NPP. The results show that (1) artificial woodlands experience a 10fold increase and account for 93 % of the land cover transfer, which was mainly from woodland areas. (2) The NPP was 906.2×109 gC·yr-1 in 2000 and 972.0×109 gC·yr-1 in 2015, presenting a total increase of 65.8×109 gC·yr-1 and a mean increase of 52.4 gC·m-2·yr-1 in Ximeng County. (3) The most notable NPP changes take place in the central and the western border regions, with the increasing NPP of artificial woodlands and arable land offsetting the negative effects of the decrease in woodland NPP. (4) The total NPP in the study area kept increasing, primarily due to the growing area of artificial woodlands as well as the stand age of the woods, whereas the mean value change of the NPP is mostly related to the increasing stand age. (5) The artificial woodlands increase the NPP value more than natural woodlands. While protecting and promoting ecologically valuable natural forests at the same time, it seems quite advantageous to establish regional plantations and coordinate their development on a scientific basis with a view to increasing NPP, economic development, but also the ecological stability of this mountain region. Our study reveals the changes in NPP and its distribution in a rapidly expanding area of artificial woodland in southwest China based on remote-sensing data and the CASA model, providing a decision-making basis for rational land-use management, the optimal utilization of land resources, and a county-scale assessment approach.
基于遥感数据的快速扩张人工林地净初级生产力时空变化
中国人工林地的扩张对区域土地覆被变化和区域净初级生产力(NPP)的变化有显著影响。以云南省西蒙县为例,研究了2000-2015年NPP的总体变化、相关幅度及时空分布特征。基于MODIS-NDVI数据、气象数据和Landsat 5 TM数据,采用Carnegie-Ames-Stanford方法对快速扩张的人工林地面积进行NPP计算。结果表明:(1)人工林地面积增加了10倍,占土地覆被转移的93%,主要来自林地;(2)西蒙县2000年NPP为906.2×109 gC·年-1,2015年NPP为972.0×109 gC·年-1,总体增加65.8×109 gC·年-1,平均增加52.4 gC·m-2·年-1。(3)中部和西部边境地区NPP变化最为显著,人工林和耕地NPP的增加抵消了林地NPP减少的负面影响。(4)研究区总NPP持续增加,主要与人工林面积的增加和林龄的增加有关,而NPP均值变化主要与林龄的增加有关。(5)人工林地对NPP值的增加大于自然林地。在保护和促进具有生态价值的天然林的同时,建立区域人工林,并在科学的基础上协调发展,对提高该山区的NPP、经济发展和生态稳定是十分有利的。基于遥感数据和CASA模型,揭示了中国西南快速扩张的人工林地NPP的变化及其分布,为合理土地利用管理和土地资源优化利用提供决策依据,并提供县域尺度的评价方法。
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来源期刊
Erdkunde
Erdkunde 地学-自然地理
CiteScore
2.00
自引率
7.10%
发文量
17
审稿时长
>12 weeks
期刊介绍: Since foundation by Carl Troll in 1947, ''ERDKUNDE – Archive for Scientific Geography'' has established as a successful international journal of geography. ERDKUNDE publishes scientific articles covering the whole range of physical and human geography. The journal offers state of the art reports on recent trends and developments in specific fields of geography and comprehensive and critical reviews of new geographical publications. All manuscripts are subject to a peer-review procedure prior to publication. High quality cartography and regular large sized supplements are prominent features of ERDKUNDE, as well as standard coloured figures.
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