Quantitative Evaluation of the Impact of Human Activities on Net Primary Productivity of Vegetation in Lüliang Mountains

doi:10.11988/ckyyb.20230452

Abstract

Abstract:

To investigate the spatial and temporal distribution patterns of vegetation net primary productivity (NPP) in the Lüliang Mountains from 2000 to 2019, and to quantitatively assess the impact of human activities on these patterns, this study employs an enhanced CASA model to estimate the actual NPP (NPP_A) for the region. By integrating the potential NPP (NPP_P) estimated using Zhou Guang-sheng’s model, we calculate the NPP loss (NPP_H) attributed to human activities. In association with the Relative Impact Contribution Index (RICI), we quantify the influence of human activities on vegetation NPP and analyze how changes in land use types affect NPP_A. Results reveal that NPP_A in the Lüliang Mountains generally exhibited a decreasing trend from southeast to northwest, while NPP_H displayed an increasing trend in the same direction. Changes in land use primarily affected forest land, farmland, grassland, and water bodies. Increasing areas of forest land and farmland led to a rise in total NPP_A, whereas converting forest land to other uses and transforming grassland into farmland resulted in a decrease in NPP_A. Human activities account for 51.80% of the observed changes in NPP, highlighting their significant role in altering NPP in the Lüliang Mountains. These findings provide a scientific foundation for the restoration, protection, and sustainable management of ecological environment in the Lüliang Mountains.

Key words: land use, NPP, CASA, human activities, quantitative evaluation

CLC Number:

TP237

MENG Xin, LIU Jun, ZHANG Ju-mei, SU Yu-fan, YANG Jun-liang. Quantitative Evaluation of the Impact of Human Activities on Net Primary Productivity of Vegetation in Lüliang Mountains[J]. Journal of Changjiang River Scientific Research Institute, 2024, 41(11): 65-74.

Figures/Tables 11

Fig.1 DEM and meteorological stations of the Lüliang Mountains

Fig.2 Correlation between NPPA value estimated in the present study and that by MOD17A3H

Fig.3 Interannual changes and area proportions of NPPA in the Lüliang Mountains from 2000 to 2019

Fig.4 Spatial distribution, interannual change rate, and significance of average NPPA in the Lüliang Mountains from 2000 to 2019

Fig.5 Spatial distribution and change rate of average NPPA in the Lüliang Mountains from 2000 to 2019

Fig.6 Multi-year average, multi-year total, and annual average NPPA of different land use types in the Lüliang Mountains from 2000 to 2019

Table 1 Conversion matrix of land use in the Lüliang Mountains from 2000 to 2019km2

土地利用类型	草地	建设用地	灌木	林地	裸地	农田	水体	流出	总计
草地	37 042	25	332	2 092	4	2 839	2 074	7 366	44 408
建设用地	14	842	0	2	0	16	7	39	881
灌木	6	0	241	659	0	0	1	666	907
林地	474	7	675	4 288	0	345	95	1 596	5 884
裸地	1	1	0	0	3	5	1	8	11
农田	143	93	1	28	0	2 643	121	386	3 029
水体	228	29	10	42	0	764	495	1 063	1 558
流入	866	145	1 018	2 823	4	3 969	2 299
总计	37 908	987	1 259	7 111	7	6 612	2 794	0	56 678

Fig.7 RICI of land use types of Lüliang Mountains in 2000 and 2019

Table 2 Net changes of NPPA of land use conversion from 2000 to 2019TgC

土地利用类型	草地	建设用地	灌木	林地	农田	水体
草地	6.09	-0.004	0.005	0.908	-0.210	-0.158
建设用地	0.000	0.027	0.003	0.134	0.005	0.001
灌木	-0.021	0.000	0.029	0.29	0.000	0.000
林地	-0.064	-0.001	-0.039	0.902	-0.015	-0.002
农田	0.222	-0.106	0.000	0.37	0.247	-0.02
水体	0.133	-0.002	0.001	0.33	0.263	0.068

Fig.8 Interannual change of RICI in the Lüliang Mountains from 2000 to 2019

Fig.9 Average value, change rate, and significance of the contribution rate of human activities

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