摘要
利用1971—2012年黄河源区5个气象站逐日气象数据,应用修定的Thornthwaite Memorial模型计算了区域内各站植被生长季(4—10月)NPP,分析了NPP的时空变化特征,同时,探讨了黄河源区NPP对各气象因子的敏感性及各气象要素对源区NPP变化的贡献程度。结果表明:42 a来黄河源区NPP在生长季平均以125.1 kg·hm-2·a-1·10a-1呈逐年上升趋势,期间存在10 a主周期变化和5 a^6 a的次周期变化;源区NPP多年来在空间变化中存在明显的地域差异,具有由南向北、自东到西NPP依次减小的分布特征;黄河源区NPP对最高气温、日照和降水量的敏感性最强,而对风速、相对湿度和最低气温的敏感性相对较弱;气象因子对源区NPP的总和贡献西北部大于东南部,这与NPP多年相对变化的地域分布特点是相一致的。
Based on the daily meteorological data from 5 climatic stations during 1971 to 2012 in source area of the Yellow River,using the revised Thornthwaite Memorial model,the Net primary productivity（ NPP） during vegetation growing season（ Apr.-Oct.） was calculated. The temporal and spatial change characteristic of NPP was analyzed. At the same time,the sensitivity of NPP to each meteorological factor and the contribution degree of each meteorological factor to the NPP change in source area of the Yellow River were discussed. The results showed that：The NPP during growing season in source area of the Yellow River has shown an upward trend year by year by the average rate of 125.1 kg·hm-2·a-1·10a-1in past 42 a,and existed main cycle change of 10 years and sub cycle change of 5 ∽ 6 years. There was obvious regional difference for the NPP in spatial change,had the decreasing distribution characteristic of NPP from south to north,and from east to west. The sensitivity of NPP to the maximal temperature,sunlight and precipitation were the strongest,and relatively weak to the wind speed,relative humidity and minimal temperature. The total contribution of meteorological factors to the NPP in northwest was greater than southeast. It was consistent with the regional distribution characteristics of the NPP relative changes over the years.
出处
《干旱地区农业研究》
CSCD
北大核心
2015年第6期210-215,共6页
Agricultural Research in the Arid Areas
基金
中国科学院寒旱区陆面过程与气候变化重点实验室开放基金(LPCC201104)
干旱气象科学研究基金(IAM201409)
关键词
植被净初级生产力
生长季
气象因子
敏感性
影响程度
黄河源区
net primary productivity（NPP）
growing season
meteorological factor
sensitivity
influence degree
source area of the Yellow River
