Journal of Resources and Ecology ›› 2020, Vol. 11 ›› Issue (6): 606-616.DOI: 10.5814/j.issn.1674-764x.2020.06.008
Special Issue: 中国耕地资源与粮食安全
• Land Resource and Land Use • Previous Articles Next Articles
ZHANG Mengyu1,2,3(), ZHANG Li1,2,4,*(
), REN Xiaoli1,2, HE Honglin1,2,4, LV Yan1,2,3, WANG Junbang1, YAN Huimin5
Received:
2020-03-18
Accepted:
2020-06-01
Online:
2020-11-30
Published:
2020-10-25
Contact:
ZHANG Li
About author:
ZHANG Mengyu, E-mail: zhangmy.18s@igsnrr.ac.cn
Supported by:
ZHANG Mengyu, ZHANG Li, REN Xiaoli, HE Honglin, LV Yan, WANG Junbang, YAN Huimin. Effect of Land Use and Land Cover Change on the Changes in Net Primary Productivity in Karst Areas of Southwest China: A Case Study of Huanjiang Maonan Autonomous County[J]. Journal of Resources and Ecology, 2020, 11(6): 606-616.
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URL: http://www.jorae.cn/EN/10.5814/j.issn.1674-764x.2020.06.008
Fig. 1 Location of the study area Note: Numbers 1 to 6 represent Dongmei, Caixia, Guzhou, Sancai, Hanwen, and Renhe small watersheds, respectively. The rocky desertification control project (referred to as RDCP) and the status of rocky desertification in all of the small watersheds were organized according to the “Huanjiang County Rock Desertification Comprehensive Management and Construction Project” and related implementation plans during 2008-2010. Due to the lag of the effect of project implementation, the RDCP activity during 2011-2013 was not considered in this study.
Reclassified type | MODIS land cover type 2 (UMD) |
---|---|
Water | Water bodies |
Forests | Evergreen needleleaf forest, Evergreen broadleaf forest, Deciduous needleleaf forest, Deciduous broadleaf forest, Mixed forest |
Shrublands | Closed shrublands, Open shrublands |
Grasslands | Woody savannas, Savannas, Grasslands |
Croplands | Croplands |
Urban | Urban and built-up lands |
Barren | Barren or sparsely vegetated lands |
Table 1 Landuse types in the reclassification
Reclassified type | MODIS land cover type 2 (UMD) |
---|---|
Water | Water bodies |
Forests | Evergreen needleleaf forest, Evergreen broadleaf forest, Deciduous needleleaf forest, Deciduous broadleaf forest, Mixed forest |
Shrublands | Closed shrublands, Open shrublands |
Grasslands | Woody savannas, Savannas, Grasslands |
Croplands | Croplands |
Urban | Urban and built-up lands |
Barren | Barren or sparsely vegetated lands |
Fig. 3 NPP changes in Huanjiang County during 2008-2013. (a) Distribution of NPP values in the county, (b) Distribution of NPP values in non-rocky desertification area (NRDL) and the potential rocky desertification or rocky desertification land (P/RDL); (c) Distribution and (d) spatial pattern of the NPP change index (K). Red dots are the averages.
Fig. 4 Spatial patterns of effects of (a) LUCC, (b) ECF and (c) their interaction on NPP, and (d) statistics for the total effect of factors on the |K|≥0.21 (i.e. the third quantile of the NPP change index) area.
Region | K_LUCC | K_ECF | K_interaction | K mean | |||
---|---|---|---|---|---|---|---|
Effect | Contribution (%) | Effect | Contribution (%) | Effect | Contribution (%) | ||
-0.36≤K<0.09 | 0.013 | 36.47 | 0.021 | 61.60 | 0.001 | 1.92 | 0.034 |
0.09≤K<0.15 | 0.037 | 30.28 | 0.080 | 65.90 | 0.005 | 3.82 | 0.121 |
0.15≤K<0.21 | 0.049 | 27.19 | 0.121 | 67.68 | 0.009 | 5.14 | 0.178 |
|K|≥0.21 | 0.053 | 19.89 | 0.197 | 73.92 | 0.017 | 6.18 | 0.267 |
Areas where LUCC occurs | 0.105 | 70.97 | 0.021 | 14.51 | 0.021 | 14.51 | 0.148 |
Huanjiang County | 0.039 | 25.23 | 0.106 | 69.61 | 0.008 | 5.16 | 0.153 |
Table 2 Statistics of K that are attributed to land use and land cover change (referred to as LUCC), the environmental comprehensive factor (ECF), and their interaction.
Region | K_LUCC | K_ECF | K_interaction | K mean | |||
---|---|---|---|---|---|---|---|
Effect | Contribution (%) | Effect | Contribution (%) | Effect | Contribution (%) | ||
-0.36≤K<0.09 | 0.013 | 36.47 | 0.021 | 61.60 | 0.001 | 1.92 | 0.034 |
0.09≤K<0.15 | 0.037 | 30.28 | 0.080 | 65.90 | 0.005 | 3.82 | 0.121 |
0.15≤K<0.21 | 0.049 | 27.19 | 0.121 | 67.68 | 0.009 | 5.14 | 0.178 |
|K|≥0.21 | 0.053 | 19.89 | 0.197 | 73.92 | 0.017 | 6.18 | 0.267 |
Areas where LUCC occurs | 0.105 | 70.97 | 0.021 | 14.51 | 0.021 | 14.51 | 0.148 |
Huanjiang County | 0.039 | 25.23 | 0.106 | 69.61 | 0.008 | 5.16 | 0.153 |
2008-2013 | Forests | Shrublands | Grasslands | Croplands | 2008 |
---|---|---|---|---|---|
Forests | — | 0.21 | 585.16 | 15.46 | 600.83 |
Shrublands | 6.01 | — | 39.50 | 1.93 | 47.44 |
Grasslands | 748.30 | 1.29 | — | 130.08 | 879.67 |
Croplands | 18.03 | 0.00 | 104.75 | — | 122.78 |
2013 | 772.34 | 1.50 | 729.41 | 147.47 | — |
Table 3 Land use transfer matrix (2008-2013) (unit: km2)
2008-2013 | Forests | Shrublands | Grasslands | Croplands | 2008 |
---|---|---|---|---|---|
Forests | — | 0.21 | 585.16 | 15.46 | 600.83 |
Shrublands | 6.01 | — | 39.50 | 1.93 | 47.44 |
Grasslands | 748.30 | 1.29 | — | 130.08 | 879.67 |
Croplands | 18.03 | 0.00 | 104.75 | — | 122.78 |
2013 | 772.34 | 1.50 | 729.41 | 147.47 | — |
Fig. 5 Spatial distribution of (a) RDCP (see Fig. 1) and (b-g) vegetation restoration measures (referred to as VRM; i.e. closing hills for afforestation, artificial afforestation, and artificial grass) in each of the six small watersheds
Regions | K | Watersheds | K of VRM | Areas (km2) | |
---|---|---|---|---|---|
VRM | Non-RDCP | ||||
Region 1 | 0.174* | 0.161* | Guzhou | 0.151 | 18.43 |
Dongmei | 0.131 | 13.16 | |||
Caixia | 0.208 | 29.26 | |||
Region 2 | 0.128** | 0.106** | Sancai | 0.108 | 27.41 |
Hanwen | 0.162 | 26.08 | |||
Region 3 | 0.137** | 0.078** | Renhe | 0.137 | 15.73 |
Table 4 Comparison of the NPP dynamic index (K) values between regions with the implementation of vegetation restoration measures and 1 km buffer areas outside of those governance regions in the six small watersheds
Regions | K | Watersheds | K of VRM | Areas (km2) | |
---|---|---|---|---|---|
VRM | Non-RDCP | ||||
Region 1 | 0.174* | 0.161* | Guzhou | 0.151 | 18.43 |
Dongmei | 0.131 | 13.16 | |||
Caixia | 0.208 | 29.26 | |||
Region 2 | 0.128** | 0.106** | Sancai | 0.108 | 27.41 |
Hanwen | 0.162 | 26.08 | |||
Region 3 | 0.137** | 0.078** | Renhe | 0.137 | 15.73 |
Fig. 6 The relative contributions of LUCC, ECF change and their interaction on NPP changes in the region with obviously changed NPP, i.e. the third quantile of the NPP change index (|K|≥0.21 during 2008-2013; |K|≥0.23 during 2005-2011).
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