1999—2015年若尔盖草原湿地净初级生产力时空变化

doi:10.13287/j.1001-9332.202002.018

应用生态学报 ›› 2020, Vol. 31 ›› Issue (2): 424-432.doi: 10.13287/j.1001-9332.202002.018

1999—2015年若尔盖草原湿地净初级生产力时空变化

郭斌^1,2, 王珊^1,2, 王明田^1,3,4*

¹高原与盆地暴雨旱涝灾害四川省重点实验室, 成都 610072;
²四川省阿坝州气象局, 四川马尔康 624000;
³四川省气象台, 成都 610072;
⁴南方丘区节水农业研究四川省重点实验室, 成都 610066

收稿日期:2019-05-22 出版日期:2020-02-15 发布日期:2020-02-15
通讯作者: * E-mail: wangmt0514@163.com
作者简介:郭斌, 男, 1971年生, 高级工程师。主要从事生态气象及高原气象信息技术研究。E-mail: abgb_001@163.com
基金资助:
本文由国家重点研发计划项目(2017YFC0504903)、国家自然科学基金项目(41775159)和高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(SCQXKJZD201805-10,SCQXKJZD2020001,SCQXKJQN2020029)资助

Spatio-temporal variation of NPP from 1999 to 2015 in Zoige grassland wetland, China

GUO Bin^1,2, WANG Shan^1,2, WANG Ming-tian^1,3,4*

¹Sichuan Province Key Laboratory of Heavy Rain and Drought-Flood Disasters in Plateau and Basin, Chengdu 610072, China;
²Aba Prefecture Meteorological Station, Maerkang 624000, Sichuan, China;
³Sichuan Meteorlogical Observatory, Chengdu 610072, China;
⁴Sichuan Province Key Laboratory of Water-Saving Agriculture in Hill Areas of Southern China, Chengdu 610066, China

Received:2019-05-22 Online:2020-02-15 Published:2020-02-15
Contact: * E-mail: wangmt0514@163.com
Supported by:
This work was supported by the National Key R&D Program of China (2017YFC0504903), the National Natural Science Foundation of China (41775159) and the Science and Technology Development Fund of Sichuan Province Key Laboratory of Heavy Rain and Drought-Flood Disasters in Plateau and Basin (SCQXKJZD201805-10, SCQXKJZD2020001, SCQXKJQN2020029)

摘要/Abstract

摘要： 植被净初级生产力(NPP)是草原湿地生态系统碳收支平衡和气候变化的核心内容之一。本研究基于植被指数、气象数据(降水和气温)、植被类型数据,利用CASA模型对若尔盖草原湿地1999—2015年NPP进行估算,分析了若尔盖草原湿地NPP时空格局特征及其与气候因子的关系。结果表明: NPP实测值与模拟值之间显著相关,R²为0.78,均方根误差为120.3 g C·m^-2·a^-1;研究区年均和生长季(4—9月)NPP分别为329.0、229.4 g C·m^-2·a^-1,年际间波动明显,以2.3、1.6 g C·m^-2·a^-1的微弱趋势下降,不同植被类型的年均及生长季NPP的年际波动与整个研究区的波动趋势基本一致;年均和生长季NPP的变化斜率分别为-21.3～18.7、-31.5～23.1 g C·m^-2·a^-1,显著增加的面积分别占研究区总面积的0.3%和0.7%,主要分布于森林覆盖区和湿地生态补偿区;显著下降的面积分别占研究区总面积的1.4%和6.4%,主要分布于人类活动集中的地区;研究区不同植被的固碳能力存在差异,其中,森林最强,草地次之,湿地最弱;降水是影响草原湿地植被NPP的主导气候因子。

Abstract: Net primary productivity (NPP) is one of the core components of the grassland wetland ecosystem carbon balance and climate change. Based on data of vegetation index, meteorology (precipitation and temperature), and vegetation type, we used the CASA (Carnegie-Ames-Stanford Approach) model to estimate NPP of the Zoige grassland wetland from 1999 to 2015. The spatial and temporal patterns of NPP in the Zoige grassland wetland ecological function area and its relationship with precipitation and temperature were examined. The results showed that the measured values of NPP were close to the simulated values, with the root mean square error being 120.3 g C·m^-2 and a R² of 0.78. The annual mean and the growth season (April-September) mean of NPP of the study area were 329.0 and 229.4 g C·m^-2·a^-1, respectively, with obvious inter-annual fluctuations, with a weak trend of decline (2.3, 1.6 g C·m^-2·a^-1). The inter-annual fluctuations of NPP in different vegetation types were basically consistent with the overall fluctuations of NPP of the whole study area. The slope of NPP in annual and growing seasons was from -21.3 to 18.7, -31.5 to 23.1 g C·m^-2·a^-1. The area with significant increase (mainly distributed in forest coverage area and wetland ecological compensation area) only accouned for 0.3% and 0.7% of the total area, and the area with significant decline (mainly distributed in areas where human activities were concentrated) only accounted for 1.4% and 6.4% of the total area, respectively. The carbon sequestration capacity of different vegetation types was different, among which the forest was the strongest, the grassland was the second, and the wetland vegetation was the weakest. Precipitation was the dominant climatic factor affecting NPP in grassland wetland.

郭斌, 王珊, 王明田. 1999—2015年若尔盖草原湿地净初级生产力时空变化[J]. 应用生态学报, 2020, 31(2): 424-432.

GUO Bin, WANG Shan, WANG Ming-tian. Spatio-temporal variation of NPP from 1999 to 2015 in Zoige grassland wetland, China[J]. Chinese Journal of Applied Ecology, 2020, 31(2): 424-432.

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1999—2015年若尔盖草原湿地净初级生产力时空变化

Spatio-temporal variation of NPP from 1999 to 2015 in Zoige grassland wetland, China

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