辽宁省净初级生产力时空演变及其对地形因子的响应

doi:10.3969/j.issn.1673-503X.2021.05.016

Abstract

Abstract:

Vegetation net primary productivity (NPP) is one of the most important indicators for assessing the quality of the ecological environment. In order to detect the changes of the ecological environment in Liaoning province, the MODIS-NDVI data and CASA model were used to estimate the NPP in Liaoning province from 2000 to 2018. Based on the estimated NPP, the temporal and spatial characteristics of NPP in Liaoning province and the relationships between NPP and topographic factors in the past 19 years were analyzed. The results show that vegetation NPP has a fluctuating upward trend in Liaoning province from 2000 to 2018, and the spatial distribution characteristics show that NPP in the east is higher than that in the west. The trend rate of NPP is 2.89 g C·m^-2·a^-1. The statistic shows that 87.4% of the areas have an increasing trend in NPP, and the fluctuations in northwestern Liaoning province are the most obvious. Elevation and slope have a more obvious impact than slope direction on the change of NPP. With the increase of elevation, NPP shows an increasing trend at first and then keeps stable, and the maximum NPP is at an elevation of 500 m. As the slope increases, NPP shows an increasing trend first and then decreasing slightly with the highest value was obtained in the lands of slope at 35°. The NPP value is the largest when the elevation is above 500 m and the slope is within the range of 15° to 35°.

Key words: CASA model, Net primary productivity (NPP), Elevation, Slope, Slope direction

CLC Number:

X171.1

Yu-hong LI,Su-lin TAO,Rong-ping LI,Ting WANG,Bin ZHOU,Jing LI,Dong-ming LIU. Temporal and spatial evolution of NPP and its responses to terrain factors in Liaoning province[J]. Journal of Meteorology and Environment, 2021, 37(5): 107-112.

Figures/Tables 5

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References 22

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等级	高程等级	变化趋势率	2000—2018年NPP平均	坡度等级	变化趋势率	2000—2018年NPP平均	坡向等级	变化趋势率	2000—2018年NPP平均
1	第一高程	1.45	235.2	平坡	1.62	233.4	平地	1.23	215.7
2	第二高程	2.70	290.9	缓坡	2.33	254.4	阴坡	2.79	311.8
3	第三高程	3.32	327.9	斜坡	3.45	331.2	半阴坡	2.91	305.4
4	第四高程	3.98	358.9	陡坡	4.53	424.7	半阳坡	3.05	308.1
5	第五高程	4.49	391.4	急坡	4.93	445.7	阳坡	3.11	308.8
6	第六高程	4.94	397.2	险坡	4.78	433.9
7	第七高程	5.29	395.7

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Temporal and spatial evolution of NPP and its responses to terrain factors in Liaoning province

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