干旱区生态环境知识资源中心(Arid): 干旱影响下光能利用率模型模拟常绿针叶林总初级生产力的比较

Arid

	干旱影响下光能利用率模型模拟常绿针叶林总初级生产力的比较
其他题名	A comparison of different radiation use efficiency models in gross primary production accuracy under drought
	董浩; 丁丽霞
来源期刊	浙江农林大学学报
ISSN	2095-0756
出版年	2021
卷号	38 期号:6 页码:1109-1116
中文摘要	【目的】研究干旱影响下不同光能利用率模型估算常绿针叶林总初级生产力(GPP)的能力,为精准模拟北半球常绿针叶林的GPP提供参考依据。【方法】采用MODIS数据和通量站点观测数据,在8 d尺度上对常绿针叶林的GPP进行参数化建模。首先利用皮尔逊相关系数和随机森林因子评价方法分析GPP各个驱动因子的重要性。使用降水量和潜在蒸散量(PET)构造干湿度指数,对各个站点进行干湿分类。其次在植被光合模型(VPM)的基础上,去除其中的水分参数,得到改进的植被光合模型(VPMsw)。最后定量比较各站点在不同干湿类型下,VPM模型与VPMsw模型拟合GPP的精度。【结果】①由驱动因子分析可知:GPP与温度、PET相关性较强,与陆表水指数(LSWI)相关性较弱,温度对GPP的重要性大于水分。②与VPM模型相比,VPMsw模型在干旱和半干旱站点拟合GPP的精度有所提高,均方根误差分别减少6.5%和23.4%,在半干旱地区精度提升效果更明显。【结论】干旱影响下,LSWI不能较好地反映干旱和半干旱地区常绿针叶林的水分情况,所以在干旱和半干旱地区,VPMsw模型拟合GPP的精度更高。
英文摘要	[Objective] With an investigation of different radiation use efficiency models estimating the gross primary production (GPP)of evergreen needle-leaved forest (ENF)under the influence of drought,this paper is aimed to provide basis for accurately simulating GPP of ENF in Northern Hemisphere.[Method] MODIS data and flux site observation data at 8-day scale were used to simulate the GPP of ENF.Firstly,Pearson correlation coefficient and random forest factor evaluation method were used to analyze the correlation and importance of each driving factor of GPP while precipitation and potential evapotranspiration (PET)were used to calculate the dry-wet index to classify the dry-wet type of each site.Secondly,the VPMsw model was constructed by deleting the moisture parameter in the vegetation photosynthesis model (VPM).Finally,the accuracy of GPP estimated from VPM model and VPMsw model were quantitatively compared under different dry and wet types at each site.[Result] (1)GPP had strong correlation with temperature and PET,but weak correlation with Land Surface Water Index (LSWI).(2)compared with the VPM model,the accuracy of VPMsw model in fitting GPP was improved in arid and semi-arid sites,and the root mean square error (RMSE)decreased by 6.5% and 23.4%,respectively.the accuracy of GPP estimates in semi-arid sites was significantly improved by the VPMsw model.[Conclusion] VPMsw model was more accurate in simulating GPP in arid and semi-arid areas because LSWI could not well reflect the water content of the ENF in arid and semi-arid areas under the influence of drought.
中文关键词	总初级生产力 ; 光能利用率模型 ; 潜在蒸散量 ; 常绿针叶林 ; 干旱
英文关键词	gross primary production (GPP) radiation use efficiency model potential evapotranspiration evergreen needleleaved forests drought
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:7106979
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/378043
作者单位	董浩, 浙江农林大学;;浙江农林大学;;浙江农林大学环境与资源学院, 浙江省省部共建亚热带森林培育国家重点实验室;;浙江省森林生态系统碳循环与固碳减排重点实验室;;, 杭州;;杭州;;杭州, 浙江;;浙江;;浙江 311300;;311300;;311300, 中国.; 丁丽霞, 浙江农林大学;;浙江农林大学;;浙江农林大学环境与资源学院, 浙江省省部共建亚热带森林培育国家重点实验室;;浙江省森林生态系统碳循环与固碳减排重点实验室;;, 杭州;;杭州;;杭州, 浙江;;浙江;;浙江 311300;;311300;;311300, 中国.
推荐引用方式 GB/T 7714	董浩,丁丽霞. 干旱影响下光能利用率模型模拟常绿针叶林总初级生产力的比较[J],2021,38(6):1109-1116.
APA	董浩,&丁丽霞.(2021).干旱影响下光能利用率模型模拟常绿针叶林总初级生产力的比较.浙江农林大学学报,38(6),1109-1116.
MLA	董浩,et al."干旱影响下光能利用率模型模拟常绿针叶林总初级生产力的比较".浙江农林大学学报 38.6(2021):1109-1116.