Dynamically monitoring productivity of cultivated land enrolled in land consolidation programs based on fusing multi-source remote sensing data: Methodology and a case study
Received date: 2017-03-10
Request revised date: 2017-07-25
Online published: 2017-09-15
Copyright
Large-scale land consolidation programs have been carried out since the late 1990s in China. Besides cultivated land preservation and food security, these programs are also proposed to improve cultivated land productivity, which remains a perennial concern at home and abroad. The reliability of data sources plays a key role in evaluating the effectiveness and efficiency of these land consolidation programs. Traditional data collecting methods, such as field interviews and questionnaires, are often criticized for their obscurity in data credibility and/or the coverage and/or monitoring continuity. Moreover, contemporary remote sensing data products are generally of the weakness in spatial-temporal resolutions. Therefore, this study proposes a multi-source remote sensing data fusion method to overcome these issues while enhance the data credibility and its spatial-temporal resolution. Specifically, this method integrates red and near-infrared Terra MODIS images that are of great temporal resolution information and Landsat TM/ETM+/OLI images that are of great spatial resolution information and further has been applied together with the CASA (the Carnegie-Ames-Stanford-Approach) model and the ESTARFM (Enhanced Spatial and Temporal Adaptive Reflectance Fusion Model) algorithm to monitor the cultivated land productivity in a land consolidation project in Shizong town, Nantong city, Jiangsu province. The result shows that compared with traditional data collecting methods and contemporary remote sensing data products (MOD17A3), our method is of better capability in differentiating land characteristics that have been influenced greatly by whether land consolidation programs are practiced, capturing fine seasonal changes in land productivity and showing dynamic process of cultivated land productivity changes in land consolidation projects. Furthermore, NPP based on the CASA model and MODIS data (MOD13Q1) could be used to monitor cultivated land productivity in land consolidation programs under the circumstance of corresponding land characteristics and regularity. In our case study area, cultivated land productivity is of the general trend of "decrease first, increase later" while the annual variation is between 519. 87 and 728. 29 g Cm-2, and land consolidation activity is not a determining factor to raise inter-annual fluctuation in cultivated land productivity. After land consolidation programs were put into practice, the average of cultivated land productivity increases and the stability of cultivated land productivity improves. In conclusion, the method which combines the CASA model and ESTARFM algorithm is feasible for dynamically monitoring the cultivated land productivity in land consolidation programs based on fusing multi-resources remote sensing data, and it could provide references for evaluating the effectiveness and efficiency of large-scale land consolidation programs.
HONG Changqiao , JIN Xiaobin , CHEN Changchun , WANG Shenmin , XIANG Xiaomin , YANG Xuhong , GU Zhengming , ZHOU Yinkang . Dynamically monitoring productivity of cultivated land enrolled in land consolidation programs based on fusing multi-source remote sensing data: Methodology and a case study[J]. GEOGRAPHICAL RESEARCH, 2017 , 36(9) : 1787 -1800 . DOI: 10.11821/dlyj201709014
Fig. 1 Location of land consolidation project and land use after consolidation图1 土地整理项目区位置及整治后土地利用状况 |
Fig. 2 General idea in this study图2 研究总体思路 |
Fig. 3 The NPP values at the three spatial resolutions in 2001图3 2001年3种空间分辨率的NPP |
Fig. 4 The NPP simulation values at the three spatial resolutions图4 3种空间分辨率多年NPP模拟值 |
Fig. 5 The differences and relations of monthly farmland NPP between the two spatial resolutions图5 两种空间分辨率下耕地逐月NPP之间的联系与差异 |
Fig. 6 Farmland information extraction capability based on NPP between the two spatial resolutions图6 两种空间分辨率NPP的耕地剥离能力分析 |
Fig. 7 Boxplots of yearly and monthly farmland NPP simulation between the two spatial resolutions图7 项目区耕地在年和月时间尺度上的两种空间分辨率NPP模拟结果箱线图 |
Fig. 8 The inter-annual variability of farmland NPP between land consolidation project and the control area图8 研究区与缓冲区耕地NPP的年际变化 |
Fig. 9 The changing process of farmland production capacity caused by land consolidation图9 土地整治引起的耕地产能变化过程 |
The authors have declared that no competing interests exist.
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| [2] |
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| [3] |
[
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| [4] |
[
|
| [5] |
[
|
| [6] |
|
| [7] |
[
|
| [8] |
[
|
| [9] |
[
|
| [10] |
[
|
| [11] |
[
|
| [12] |
[
|
| [13] |
[
|
| [14] |
[
|
| [15] |
[
|
| [16] |
[
|
| [17] |
|
| [18] |
[
|
| [19] |
|
| [20] |
|
| [21] |
[
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
[
|
| [26] |
[
|
| [27] |
[
|
| [28] |
[
|
| [29] |
[
|
| [30] |
|
| [31] |
[
|
| [32] |
|
| [33] |
[
|
| [34] |
|
| [35] |
[
|
| [36] |
[
|
| [37] |
|
| [38] |
[
|
| [39] |
[
|
| [40] |
[
|
| [41] |
[
|
| [42] |
[
|
| [43] |
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