Wu Gang, Wang Yongxiang, Yu Deyong, Pan Yaozhong, Zhang Liang, Shao Hongbo
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Beijing 100085, China.
Pak J Biol Sci. 2007 Sep 1;10(17):2800-8. doi: 10.3923/pjbs.2007.2800.2808.
In many East Asia regions, spring (from March to May) precipitation is an important restricting factor to vegetation growth. By analyzing the coupling features of spring NPP with precipitation, the result was found that the response features of NPP to precipitation were mainly embodied within the leading six NPP-precipitation paired-modes. The explanation rates of the leading six paired-modes to the covariance of NPP-precipitation were 42.91, 23.29, 9.96, 5.60, 5.04 and 3.95%, respectively and total to 90.75%. The temporal correlation coefficients of the leading six paired-modes were 0.830, 0.889, 0.841, 0.747, 0.912 and 0.923, respectively and all the correlations were significant at the level of 0.001. In some high altitude regions, there was no obviously corresponding relationship between NPP and precipitation in the leading two paired-modes and the reason of it may be that spring temperature was the main restricting factor to NPP. In middle and low altitude regions, the effect of precipitation on NPP was relatively more notable. Nine atmospheric circulation factors in spring affected the patterns of NPP and precipitation greatly and the affected regions with explanation rate to precipitation and NPP changes over 50% shared 65.58 and 60.41% to the whole study area, respectively.
在许多东亚地区，春季（3月至5月）降水是植被生长的重要限制因素。通过分析春季净初级生产力（NPP）与降水的耦合特征，发现NPP对降水的响应特征主要体现在前六个NPP-降水配对模式中。前六个配对模式对NPP-降水协方差的解释率分别为42.91%、23.29%、9.96%、5.60%、5.04%和3.95%，总计达90.75%。前六个配对模式的时间相关系数分别为0.830、0.889、0.841、0.747、0.912和0.923，所有相关性在0.001水平上均显著。在一些高海拔地区，前两个配对模式中NPP与降水之间没有明显的对应关系，其原因可能是春季温度是NPP的主要限制因素。在中低海拔地区，降水对NPP的影响相对更显著。春季的九个大气环流因子对NPP和降水格局有很大影响，降水和NPP变化解释率超过50%的受影响区域分别占整个研究区域的65.58%和60.41%。
