基于CASA模型的植被第一性生产力人为影响定量研究——以石羊河流域为例

Abstract

Abstract: Human activity is one of the main factors to affect NPP variation, it has great significance to quantify NPP which was influenced by humans( HNPP).This study put forward a modified CASA model to calculate the theoretical NPP and the actual NPP to obtain human influence value.This paper takes Shiyang River Basin,Gansu Province,China as the study area, uses the improved CASA model to calculate the theory NPP and the actual NPP, and then obtains the artificial influence value of NPP, analyzing the distribution and change law of the human influence value of NPP in the basin. The results showed as follows:(1) during 2001 to 2014,the mean annual NPP was simply increased.The average actual NPP was 261.70 gC·m^-2·a^-1 and the total was 10.62 TgC·a^-1.(2)whether it was a positive influence or negative influence,and it was greatly fierceness. Influence values ranged from -644.15 to 740.31 gC·m^-2·a^-1. The average of increase influence was 1.93 TgC·a^-1, and the average of negative influence was 3.16 TgC·a^-1 under human activities. That Shiyang River Basin was obviously dominated by negative influence which accounted for 75.48 percent of the total area of the overall situation indicated the vegetation of the basin had been degraded under human activities. (3) the variation trend of anthropological influence was remarkable in the period of study. The sum of absolute value of influenced value was decreased by 26 592 gC·m^-2·a^-2. It showed that human activities were gradually slowing down. Besides, that algebraic sum of influenced value was decreased by 82 856 gC·m^-2·a^-2 showed negative influence was weakened and ecological management has achieved initial success. (4) negative impact decreased area was more than others obviously, which accounted for 75.48 percent of total area and was mainly distributed in the downstream desert, it indicated that the downstream of the vegetation NPP was being increased, and the ecological environment was being improved.

Key words: net primary productivity, CASA model, human activities, Shiyang River Basin

CLC Number:

Q948.112

LI Chuan-hua, FAN Ye-ping, CAO Hong-juan, HAN Hai-yan. Impact of human activities on net primary productivity based on the CASA model:a case study of the Shiyang River Basin[J].干旱区地理, 2018, 41(1): 142-151.

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Impact of human activities on net primary productivity based on the CASA model:a case study of the Shiyang River Basin

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