Spatial-temporal Variation Characteristics of NPP and the Driving Factors: A Case Study of Yan’an

doi:10.11924/j.issn.1000-6850.casb2021-0733

Abstract

Abstract:

Based on the net primary productivity of vegetation (NPP) from 2000 to 2009, and considering the four natural factors of climate, vegetation, topography and soil, we used trend analysis and geodetector method to reveal the temporal and spatial variation of NPP and its driving factors in Yan’an. The results showed that: (1) from 2000 to 2009, NPP in the study area presented an upward trend in general; (2) the spatial distribution of NPP in the study area was high in the south and low in the north; (3) precipitation, vegetation type, elevation and temperature were the main driving factors of the spatial distribution pattern of NPP in the study area. The contribution rate of interaction of any two natural factors was higher than that of single factor. China’s Grain to Green Program conducted in the study area and the climate fluctuations were the main reasons for the interannual increase of the NPP. The spatial differentiation of NPP was affected by the interaction of various natural factors. The study on spatial and temporal variation of NPP and its driving force could provide a theoretical basis for regional ecosystem restoration.

Key words: NPP, spatial-temporal variation, geodetector, trend analysis, driving factors, Yan’an

CLC Number:

TP79

MA Su, CUI Guoyi, ZHAO Yu, ZHAO Ying, LIU Xuezhen, ZHANG Chengdong. Spatial-temporal Variation Characteristics of NPP and the Driving Factors: A Case Study of Yan’an[J]. Chinese Agricultural Science Bulletin, 2022, 38(19): 93-98.

Figures/Tables 8

References 32

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判断依据	交互作用
P(X₁∩X₂)<min[P(X₁),P(X₂)]	非线性减弱
min[P(X₁),P(X₂)]<P(X₁∩X₂)<max[P(X₁),P(X₂)]	单因子非线性减弱
P(X₁∩X₂)>max[P(X₁),P(X₂)]	双因子增强
P(X₁∩X₂)>P(X₁)+P(X₂)	非线性增强
P(X₁∩X₂)=P(X₁)+P(X₂)	独立

判断依据	交互作用
P(X₁∩X₂)<min[P(X₁),P(X₂)]	非线性减弱
min[P(X₁),P(X₂)]<P(X₁∩X₂)<max[P(X₁),P(X₂)]	单因子非线性减弱
P(X₁∩X₂)>max[P(X₁),P(X₂)]	双因子增强
P(X₁∩X₂)>P(X₁)+P(X₂)	非线性增强
P(X₁∩X₂)=P(X₁)+P(X₂)	独立

NPP多年均值/[g C/(m²·a)]	面积/km²	占比/%
0~200	23328	63
200~400	4415	12
400~600	2280	6.5
600~800	2280	6.5
800~1000	2707	7
>1000	1770	5

NPP多年均值/[g C/(m²·a)]	面积/km²	占比/%
0~200	23328	63
200~400	4415	12
400~600	2280	6.5
600~800	2280	6.5
800~1000	2707	7
>1000	1770	5

项目	降水	气温	高程	植被	底土有机碳	表土有机碳	pH	土壤质地	有效贮水量
解释力	0.70	0.09	0.07	0.42	0.001	0.005	0.004	0.002	0.003
显著性水平	0	0	0	0	0.85	0.99	0.89	0.75	0.69