基于Daycent模型的三江源地区草地NPP估算及其对气候变化的响应  

Estimation of grassland net primary productivity in Three-River Headwaters region based on Daycent model and its response to climate change

作　　者：朱美婷 张美玲[1] 贾晓楠 聂雅梅 曹瑞红 罗上学 李晓娟 ZHU Mei-ting;ZHANG Mei-ling;JIA Xiao-nan;NIE Ya-mei;CAO Rui-hong;LUO Shang-xue;Li Xiao-juan(College of Science,Gansu Agricultural University,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学理学院,甘肃兰州730070

出　　处：《草原与草坪》2023年第2期13-21,共9页Grassland and Turf

基　　金：国家自然科学基金(32260353);甘肃省重点研发计划(21YF5WA096);科技部高端外国专家引进计划(G2022042009L);甘肃省自然科学基金项目(1606RJZA077,1308RJZA262)。

摘　　要：【目的】探求1971-2020年草地NPP的时空变化特征及其与气候因子的关系。【方法】基于Daycent模型估算三江源地区草地NPP,结合同期温度和降水数据,运用多元回归分析法进行分析。【结果】1)三江源地区草地NPP多年的年平均值为168.10 gC/m^(2),空间上呈现东高西低,南高北低的格局。2)高寒草甸类年均NPP为227.44 gC/m^(2),高寒草原类年均NPP为117.23 gC/m^(2)。3)当降水量小于450 mm时,温度与草地NPP呈正相关;当降水量大于450 mm时,温度与草地NPP呈负相关。【结论】三江源地区草地NPP呈自东南向西北递减的空间格局;不同草地类型中,高寒草甸类年均NPP大于高寒草原类年均NPP,且高寒草原类年均NPP有显著的增加趋势;三江源地区的草地NPP与降水量呈显著相关关系,温度对该地区的草地NPP也有影响。【Objective】This research was to explore the spatial⁃temporal variation of grassland net primary pro⁃ductivity(NPP)and its relationship with climate factors during 1971~2020.【Method】Based on the Daycent model,the grassland NPP in the Three⁃River Headwaters region was estimated,and multiple regression analysis was used in conjunction with temperature and precipitation data in the same period of time.【Result】1)The average annual NPP in Three⁃River headwaters region was 168.10 gC/(m^(2)·a),and presented a pattern with higher in the east and south,but lower in the west and north.2)The average annual NPP of alpine meadow was 227.44 gC/(m^(2)·a),and the average annual NPP of alpine grassland was 117.23 gC/(m^(2)·a).3)When precipitation was less than 450 mm,the grassland NPP was positively correlated with temperature.When precipitation was greater than 450 mm,the NPP of grassland was negatively correlated with temperature.【Conclusion】The grassland NPP in the Three⁃river Headwaters region showed a spatial pattern of decreasing from southeast to northwest;Among different grass⁃land types,the average annual NPP of alpine meadow was higher than that of alpine grassland,and the average an⁃nual NPP of alpine grassland had a significant increasing trend;There was a significant correlation between grassland NPP and precipitation in the Three⁃River headwaters region.Temperature also influenced grassland NPP in this re⁃gion.

关 键 词：Daycent模型 三江源地区 净初级生产力 

分 类 号：S812.1[农业科学—草业科学]