江西省老虎脑自然保护区气候特征及植被NPP分析

【目的】对水、光、热等主要气候因素变化特征进行分析,有助于全面了解并合理利用当地气候资源,为水资源利用、农业生产规划、生态环境监测等提供依据。【方法】基于乐安县1960-2016年气温、降水、日照时数等气候数据,探讨了该地区气候特征变化规律,并对其植被NPP进行分析研究。【结果】近57年来乐安县老虎脑自然保护区历史多年来年均气温呈显著升高趋势,突变点出现在1998年;四季气温升幅不一,以春、冬升温幅度最大,且是年均气温升高的主导因素;年降水量及夏、秋、冬季降水量表现为微弱的增加趋势,而春季降水量微弱减少;全年日照时数显著减少,减少突变点为1986年,1988年后减少显著;四季日照减幅由高到低依次为夏季、秋季、冬季、春季;不同海拔气温和相对湿度存在差异;老虎脑保护区年平均NPP值较高,且西部区域的NPP整体高于东部。【意义】研究结果可为推进老虎脑自然保护区生态环境调节及修复提供理论与数据支持。

Analysis of Climatic Characteristics and Net Primary Productivity in Laohunao Nature Reserve in Jiangxi Province

Purposes]The analysis of the change characteristics of water,light,heat and other major climate factors was conducted to get the comprehensive understanding and the rational use of the local climate resources,and so as to provide a basis for the utilization of water resources,the agricultural production planning and the ecological environment monitoring.Methods]Based on the climate data of Le’an County from 1960 to 2016,including temperature,precipitation and sunshine duration,the climate characteristics and NPP in this area were analyzed and studied in this paper.Findings]The results showed that in the past 57 years,the average annual temperature in Laohunao Nature Reserve in Le’an County had been increasing significantly,and the abrupt change occurred in 1998.The seasonal temperature increase was different,with spring and winter warming the largest extent,which was the leading factor of the annual average temperature rise.The annual precipitation,and summer,autumn and winter precipitation showed a slight increase trend,while spring precipitation slightly decreased.The number of annual sunshine hours decreased significantly in the whole year,and the mutation point decreased significantly in 1986 and 1988.The sunshine decreasing amplitude in four seasons showed that summer was larger than autumn,winter was larger than spring,and there were differences in temperature and relative humidity at different altitude.The mean annual NPP value in Laohunao Nature Reserve was higher,and the NPP in the western region was higher than that in the eastern one.Significances]The results could provide theoretical and data support for promoting the ecological environment regulation and restoration in Laohunao Nature Reserve.