ABSTRACT

Carbon use efficiency (CUE) of vegetation in Western Sichuan Plateau (WSP) can influence ecological safety and economic development in the Sichuan Basin and Yangtze River Basin in addition to its importance in determining local ecological environment and development of animal husbandry. Temporal-spatial variations of vegetation CUE as well as its responses to climate changes were investigated through trend analysis and grey relational analysis (GRA) by combining data from meteorological stations, vegetation types and elevation data from WSP. Moreover, the influences of human activities on vegetation CUE were analysed. The results showed that the variation trend of CUE in WSP was unclear, and the variation rate was between −0.11 and 0.10 (per decade) during the growing seasons from 2001 to 2018. Among the climate factors, sunshine duration influenced vegetation CUE mostly, followed by precipitation and air temperature successively. The lagged time of response of vegetation CUE to precipitation was not significant, but to air temperature and sunshine duration was 1–2 months. Human activities have only a slight influence on vegetation CUE in WSP.

摘要

川西高原植被的碳利用效率（CUE）除了对确定当地生态环境和畜牧业发展具有重要意义外，还可以影响四川盆地和长江流域的生态安全和经济发展。通过趋势分析和灰色关联分析（GRA），结合气象站的数据，植被类型和WSP的海拔数据，研究了植被CUE的时空变化及其对气候变化的响应。此外，分析了人类活动对植被CUE的影响。结果表明，从2001年到2018年，WSP中CUE的变化趋势尚不清楚，变化率在-0.11至0.10（每十年）之间。日照时间对植被CUE的影响最大，其次是降水和气温。植被CUE对降水的响应滞后时间不明显，但对气温和日照时间的响应为1-2个月。人类活动对WSP中植被CUE的影响很小。