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[1]WANG Lixia,DING Huilan,LIU Zhao,et al.Spatiotemporal Change of NPP Based on CASA Model and Its Response to Climate Change in Jing River Basin[J].Research of Soil and Water Conservation,2022,29(01):190-196.

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Spatiotemporal Change of NPP Based on CASA Model and Its Response to Climate Change in Jing River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 190-196 Column: Public date: 2022-02-20

Title:: Spatiotemporal Change of NPP Based on CASA Model and Its Response to Climate Change in Jing River Basin

Author(s):: WANG Lixia¹, DING Huilan¹, LIU Zhao², ZHANG Shuangcheng¹, KONG Jinling¹; (1.School of Geological Engineering and Surveying and Mapping, Chang 'an University, Xi 'an 710054, China; 2.School of Water and Environment, Chang 'an University, Xi 'an 710054, China)

Keywords:: CASA Model; NPP simulation; time-space dynamics; climate change; Jing River Basin

CLC:: Q948; TP79

DOI:: -

Abstract:: NPP is the main factor to judge the carbon source/sink of ecosystem and regulate the ecological process. Therefore, we estimated NPP based on CASA model, and explored the change of NPP in temporal and spatial scale and its response to climate change, which can present the vegetation restoration status of Jinghe River Basin, and provide scientific reference and suggestions for the improvement of ecological environment of this basin. Based on MODIS NDVI data in 2000, 2009, 2018, meteorological data and vegetation distribution data, etc., we used Carnegie-Ames-Stanford approach(CASA)model to estimate NPP of the basin vegetation in 2000, 2009 and 2018, explored the NPP in the basin and its response to climate change, and analyzed the distribution rule of NPP under various vegetation types. The results showed that:(1)on the time scale, the mean values of NPP in the Jing River Basin in 2000, 2009 and 2018 were 521.81, 664.77 and 719.78 gC/(m²·a), respectively, showing an increasing trend in the inter-annual variation; the intermonthly change curve showed a single peak type, showing the strong upward trend from April to August, and gradually decreased after August; the mean value of NPP in each season decreased in the order: summer>autumn>spring>winter;(2)on the spatial scale, there was certain spatial differences in the distribution of NPP: the horizontal direction showed the characteristics of high in the south and low in the north; in the vertical direction, the value of NPP decreased first and then increased with the increase of altitude;(3)the mean values of NPP of different vegetation types were significantly different, among which the average annual value of NPP [1 544 gC/(m²·a)] of evergreen broad-leaved forest landscape was higher than those of the others;(4)under the background of climate change, NPP was mainly affected by temperature and precipitation, and precipitation was the dominant factor. These results show that the NPP in Jinghe River Basin is increasing, that is, the vegetation coverage is gradually improving; the vegetation coverage in the north of the basin still needs to be improved. It is suggested to strengthen the implementation of the policy of returning farmland to forest and increase the planting of protective forest lands such as fruit trees and tea trees; moreover, the response of NPP in the basin to precipitation is stronger than that of temperature, therefore, increasing the intensity of afforestation and vegetation restoration, building reservoirs and water conservancy projects, returning farmland to lake, and enhancing wetland protection were suggessted, so as to ensure air humidity, increase precipitation, improve vegetation coverage, and realize the harmonious coexistence between human and nature.

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Last Update: 2022-02-20