[1]TONG Linjing,LIU Yangyang,ZHANG Zhaoying,et al.Quantitative Assessment on the Relative Effects of Climate Variation and Human Activities on Grassland Dynamics in Northwest China[J].Research of Soil and Water Conservation,2020,27(06):202-210.
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Quantitative Assessment on the Relative Effects of Climate Variation and Human Activities on Grassland Dynamics in Northwest China
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 06
Page number:
202-210
Column:
目次
Public date:
2020-10-20
- Title:
- Quantitative Assessment on the Relative Effects of Climate Variation and Human Activities on Grassland Dynamics in Northwest China
- Keywords:
- NPP; grassland; climate variation; human activities; northwest China
- CLC:
- Q948; P467
- DOI:
- -
- Abstract:
- In order to quantitatively distinguish the relative contributions of climate and human factors in the process of grassland dynamics, based on the remote sensing data and human factor data, combination of CASA model and Thornthwaite memorial model, the relative contributions of climate variation and human activities to grassland primary net productivity(NPP)in northwest China were quantitatively assessed. The results showed that:(1)83.20% of total grassland area exhibited restoration during 2000—2015, while only 16.8% underwent degradation; the increment of total NPP was 18 645.56 Tg C, and the loss of total NPP was 428.16 Tg C;(2)human activities were the main reason for grassland restoration; the human-induced restoration areas and NPP loss were 1.11×106 km2 and 10 478.4 Tg C, respectively; grassland degradation was mainly caused by climate variation; the climate-induced grassland degradation area accounted for 9.97% of the total grassland area, resulting in loss of 341.76 Tg C of NPP;(3)further analysis demonstrated that the restoration in northwest China mainly attributed to the implementation of the grassland protection policies, while the mitigation of drought was main climatic factor for grassland restoration. Unbalance of local hydrothermal condition(climatic factor)and irrational human activities(population increase, overgrazing and grassland reclamation)were the reasons for grassland degradation.
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Last Update:
2020-10-20