近20 a新疆天然草地NPP时空分析

doi:10.12118/j.issn.1000–6060.2021.300

摘要/Abstract

摘要：

基于MOD17A3HGF NPP（Net primary productivity）与气温、降水量等数据,采用趋势分析与偏相关分析,在多个尺度（全疆、北疆与南疆、各地州市与11种草地类型）探讨了2000—2018年新疆天然草地NPP时空动态及其对气候变化的响应。结果表明：近20 a新疆草地NPP呈波动递增,多年均值为0.103 kg C·m^-2,由准噶尔西部山地、伊犁河谷、天山、阿尔泰山向准噶尔盆地、塔里木盆地逐渐降低;北疆草地多年平均NPP（0.149 kg C·m^-2）高于南疆（0.055 kg C·m^-2）,北疆、南疆草地NPP均表现为增加趋势;各地、州、市草地NPP总体为增加,但年际变化分异明显;11种天然草地类型（除高寒荒漠类）NPP表现为递增趋势,但不同草地类型存在差异。2000年后,新疆气候暖湿化有利于草地植被生长,但降水年际变化增强导致草地NPP年际波动剧烈。研究结果为新疆天然草地碳收支评估提供基础数据,能够促进天然草地健康评价以及可持续利用。

关键词: 非对称暖湿化, NPP, 时空动态, 空间对地观测, 新疆天然草地

Abstract:

This study investigates the spatiotemporal dynamics of natural grassland NPP and its response to climatic change in Xinjiang Uygur Autonomous Region, China from 2000 to 2018, based on MOD17A3HGF NPP data and related auxiliary datasets (e.g., temperature and precipitation). The different spatial scales (in whole Xinjiang, northern and southern Xinjiang, various prefectures, and different natural grassland types, respectively), inter-annual changes, trend analysis, and partial correlation analysis were adopted to characterize grassland NPP variation. The results illustrate that grassland NPP showed an increased volatility trend from 2000 to 2018, and the mean average of NPP is 0.103 kg C·m^-2. In terms of spatial pattern, it decreases gradually from the western mountains of Junggar, Ili River Valley, Tianshan Mountains, and Altay Mountains to the Junggar and Tarim Basin. Although the grassland NPP of northern Xinjiang (0.149 kg C·m^-2) is higher than that of southern Xinjiang (0.055 kg C·m^-2), its inter-annual fluctuations are greater than that of southern Xinjiang. Grassland NPP in the entire state shows an increasing trend, but the inter-annual changes are distinct. The NPP of 11 natural grassland types (except for alpine deserts) is increasing; however, there are big differences in variable grassland types. Therefore, it is beneficial to the growth of grassland vegetation after 2000 that the warming-wetting trend and mitigation of human interference in Xinjiang. However, anomalies of inter-annual precipitation result in the inter-annual fluctuations of grassland NPP.

Key words: asymmetric warming-wetting, net primary productivity, spatiotemporal dynamics, space earth observation, natural grassland in Xinjiang

陈春波,李刚勇,彭建. 近20 a新疆天然草地NPP时空分析[J]. 干旱区地理, 2022, 45(2): 522-534.

CHEN Chunbo,LI Gangyong,PENG Jian. Spatiotemporal analysis of net primary productivity for natural grassland in Xinjiang in the past 20 years[J]. Arid Land Geography, 2022, 45(2): 522-534.

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