甘肃省草地NPP时空变化及对气候因子的响应  

Spatio-temporal Variation of NPP and its Response to Climate Factors in Grassland,Gansu Province

作　　者：何国兴 柳小妮[1,2] 张德罡[1,2] 杜月红 李强[1,2] 刘志刚 关文昊 杨军银 韩天虎 孙斌 潘冬荣 HE Guo-xing;LIU Xiao-ni;ZHANG De-gang;DU Yue-hong;LI Qiang;LIU Zhi-gang;GUAN Wen-hao;YANG Jun-yin;HAN Tian-hu;SUN Bin;PAN Dong-rong(College of Pratacultural Science,Gansu Agricultural University,Lanzhou,Gansu Province 730070,China;Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province,Lanzhou,Gansu Province 730070,China;College of Finance and Economics,Gansu Agricultural University,Lanzhou,Gansu Province 730070,China;Grassland Technique Extension Station of Gansu Province,Lanzhou,Gansu Province 730000,China)

机构地区：[1]甘肃农业大学草业学院,甘肃兰州730070 [2]草业生态系统教育部重点实验室(甘肃农业大学),甘肃兰州730070 [3]甘肃农业大学财经学院,甘肃兰州730070 [4]甘肃省草原技术推广总站,甘肃兰州730000

出　　处：《草地学报》2021年第4期788-797,共10页Acta Agrestia Sinica

基　　金：国家自然科学基金(31160475);甘肃省草原技术推广总站“甘肃省新一轮草原补奖效益评估及草原生态评价研究(XZ20191225)”;甘肃省农业财政项目“超低空微遥感技术在草原监测中的应用研究及推广示范(201647)”;甘肃省草原技术推广总站“草原综合顺序分类法在甘肃省草原资源调查中的应用及其与中国草地分类系统的整合研究(034036237)”项目资助。

摘　　要：本研究利用MOD17A3 NPP和气象数据对甘肃省天然草原2000—2019年净初级生产力(net primary productivity,NPP)进行动态监测,并利用趋势分析法和变异系数法研究近20年草地NPP时空变化规律与气候因子的响应。结果表明:近20年,甘肃省草地NPP呈波动上升趋势,增速达4.72 gC·m^(-2)·a^(-1)·(10a)^(-1),草地NPP分布由东南向西北递减;20年间草地NPP呈显著增加趋势的面积占甘肃省草地的75.70%,主要分布在陇中黄土高原、河西走廊、祁连山地大部以及陇南山地;草地NPP变异系数小于0.15的面积仅占40.31%,以山地草甸、低地草甸和高寒草甸为主,草地NPP整体呈现高波动性;草地NPP与降水量的相关性最高,温性草原NPP对降水量的响应最敏感,温性荒漠草原次之,高寒草原对降水响应最低。综上所述,甘肃省草地NPP呈现增长趋势但稳定性低,对降水量的响应强于气温,生态工程对草地NPP具有促进作用,需长期实施。In this study,MOD17A3 NPP and meteorological data were used to monitor net primary productivity(NPP)dynamic of natural grassland in Gansu Province from 2000 to 2019.And spatio-temporal variation of NPP and its response to climate factors in the past 20 years were studied by means of trend analysis and variation coefficient method.The result showed that,NPP was on a fluctuating increased trend with a growth rate of 4.72 gC·m^(-2)·a^(-1)·(10a)^(-1),and the NPP distribution was gradually decreased from southeast to northwest.The significantly increased area of NPP,which was mainly distributed in the Loess Plateau,Hexi Corridor,most of the Qilian Mountains and Longnan Mountains,was occupied 75.70% of the total grassland area in Gansu Province.The grassland area of NPP coefficient of variation less than 0.15 was only occupied 40.31%,taking mountain meadow,lowland meadow and alpine meadow as three main types.The overall NPP of grassland appeared with a high volatility.The correlation between NPP and precipitation was the highest,and the response sensitivity decreased in order of temperate steppe,temperate desert and alpine steppe.In conclusion,the ecological engineering should be continually implemented in Gansu province,because of its facilitation effect on NPP.

关 键 词：甘肃省 草地NPP 时空变化 气候因子 

分 类 号：Q948[生物学—植物学]