锡林郭勒盟净初级生产力时空变化及其气候影响  

Spatiotemporal variation of net primary productivity and its climatic driving factors in Xilingol League

作　　者：王爽 李庆旭 张彪[1,2] WANG Shuang;LI Qing-xu;ZHANG Biao(Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;China Ecological Civilization Research and Promotion Association,Beijing 100035,China)

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院大学资源与环境学院,北京100049 [3]中国生态文明研究与促进会,北京100035

出　　处：《生态学杂志》2021年第3期825-834,共10页Chinese Journal of Ecology

基　　金：国家重点研发计划(2016YFC0503403)资助。

摘　　要：净初级生产力(NPP)是表征生态系统质量与功能的核心指标,监测生态工程区NPP的时空变化是生态建设成效评估的重要内容。本文利用2000—2015年时序遥感数据与光能利用效率模型(CASA),分析了锡林郭勒盟NPP的时空变化以及气温与降水的影响。结果表明:2000—2015年锡林郭勒盟的NPP为108.66~359.74 g C·m^(-2)·a^(-1),多年平均值为254.18 g C·m^(-2)·a^(-1),年均增加13.47 g C·m^(-2);锡林郭勒盟的NPP由东向西递减趋势明显,40.13%的区域NPP高于280 g C·m^(-2)·a^(-1),且集中在太仆寺旗、多伦县、西乌珠穆沁旗和东乌珠穆沁旗等地区;相比2000年,2015年锡林郭勒盟有94.56%的区域NPP升高,其中33.95%的区域NPP增幅高于120 g C·m^(-2);锡林郭勒盟的NPP与降雨量呈显著正相关,31.18%的区域NPP与气温呈正相关,NPP与年均气温及降水量的复相关系数为0.59。综合来看,锡林郭勒盟约55%的区域NPP明显受气候因素驱动,其生态修复治理应充分利用气候变化的积极影响,而其他区域则需注重施加生态工程措施。Net primary productivity(NPP)is widely used in evaluating the quality and function of ecosystems.Monitoring the temporal and spatial variations of NPP in ecological engineering region is an important task of ecological construction effectiveness evaluation.Here,we evaluated the spatial-temporal variations of NPP in Xilingol League using sequential remote sensing data from 2000 to 2015 and Carnegie-Ames Stanford approach(CASA),and analyzed the impacts of temperature and precipitation on NPP.The results showed that the NPP of Xilingol League ranged from 108.66 to 359.74 g C·m^(-2)·a^(-1)during 2000-2015,with an average growth rate of 13.47 g C·m^(-2)·a^(-1).The average NPP in Xilingol League was 254.18 g C·m^(-2)·a^(-1)from 2000 to2015,with a spatially descending trend from east to west.The NPP in Taipusi Banner,Duolun County,Xiwuzhumuqin Banner and Dongwuzhumuqin Banner was above 280 g C·m^(-2)·a^(-1),the total areas of these regions covered 40.13% of Xilingol League.Approximately 94.56% of total area in Xilingol League showed an increasing tendency in NPP between 2000 and 2015,while the increased magnitude of NPP in 33.95% of area was more than 120 g C·m^(-2).The NPP in Xilingol League was positively correlated with rainfall,while 31.18% of area showed a positive correlation between NPP and temperature.The complex correlation coefficient between NPP and annual temperature and precipitation reached 0.59.We conclude that the NPP in about 55% of area is clearly driven by climatic factors.These regions should fully utilize the positive effects of climate change on ecological restoration.More ecological engineering measures should be adopted in the rest areas where the NPP is relatively insensitive to climate change.

关 键 词：净初级生产力 时空变化 生态工程 京津风沙源区 锡林郭勒盟 

分 类 号：Q948.1[生物学—植物学]