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

摘要/Abstract

摘要： 人类活动是影响植被净第一性生产力（Net Primary Productivity，NPP）变化的主要因子之一，定量计算NPP人为影响值具有重要意义。以石羊河流域为研究区，采用改进CASA模型计算理论NPP和实际NPP，并求得NPP人为影响值，分析了该流域NPP人为影响值的分布和变化规律。结果表明：（1）2001—2014年石羊河流域年均实际NPP为261.70 gC·m^-2·a^-1，总量为10.62 TgC·a^-1，NPP呈略微上升趋势。（2）人类活动对NPP的正向和负向影响都非常强烈，影响值介于-644.15~740.31 gC·m^-2·a^-1之间。在人为作用下，正向影响总量年均为1.93 TgC·a^-1，负向影响总量年均为3.16 TgC·a^-1，整体表现为明显负影响，表明该流域植被在人为作用下一直处于退化状态。（3）研究期间人为作用变化显著，人为正负影响绝对值之和呈减小趋势（年均减少速率为26 592 gC·m^-2·a^-1），说明人类活动有所减缓；同时人为正负影响值代数和也呈减小趋势（年均减少速率为82 856 gC·m^-2·a^-1），说明人类对植被的负影响效应正在减弱，表明治理初见成效。（4）研究期间人为负向影响减弱区面积占流域面积的41.04%，主要分布在下游荒漠区，说明下游植被NPP有所增加，生态环境有所改善。

关键词: 植被净第一性生产力, CASA模型, 人类活动, 石羊河流域

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

中图分类号:

Q948.112

李传华, 范也平, 曹红娟, 韩海燕. 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[J]. 干旱区地理, 2018, 41(1): 142-151.

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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