摘要
凋落物是物质和养分从绿色植物流动和归还到无机环境的主要载体,因此凋落物生物量是反映草原生态系统健康的重要指标。本研究基于2003-2020年的MODIS卫星遥感数字产品,构建内蒙古锡林郭勒草原的逐月凋落物生物量指数。随后分析发现,在锡林郭勒草原区域水平上,降水、绿色植物生物量对凋落物生物量年际间变异的解释度较低,表明本区域凋落物生物量的波动并不由这些自然因素主导。逐像元趋势分析发现,在2003-2020年间,关键物候期(当年10月和次年4月)的凋落物生物量仅在本区域10.1%和15.1%的像元呈显著增加趋势,在其它像元变化趋势并不显著。因此,我们认为本地区的植被恢复,仍有很大的提升空间。
Litter is the key carrier of the ecosystem that supports material decomposition and nutrient flows between live plants and the environment.Hence,litter biomass is one of the critical indicators for ecosystem health.This study calculated the monthly litter biomass index based on the MODIS remote sensing data from the year 2003 to 2020 in the Xilingol steppe,Inner Mongolia.The study revealed that the rainfall and green biomass only explained the variance of litter biomass at a relatively low level on the regional scale,which indicated these natural factors did not dominate the changes of litter biomass.Furthermore,the pixel-by-pixel analysis only detected the increasing trend of litter biomass index at 10.1%and 15.1%area of this region for the two key phenological periods(October and April in the next year)from the year 2003 to 2020.The dynamic analysis results suggested that although previous studies found that significant improvements in green biomass in the Xilingol steppe,the litter biomass had not recovered in the period from 2003 to 2020.Therefore,the vegetation and ecosystem had not really recovered from the perspective of litter biomass.
作者
陈章
李磊
赵晋灵
王建柱
殷贺
李昂
CHEN Zhang;LI Lei;ZHAO Jinling;WANG Jianzhu;YIN He;LI Ang(Department of Biology and Pharmacy,China Three Gorges University,Yichang 443002,China;Water and Soil Pollution Prevention and Management Center of Yichang,Yichang 443002,China;Guanghua School of Management,Peking University,Beijing 100871,China;Elion Resources Group,Beijing 100026,China;Department of Geography,Kent State University,Kent 98030,USA;Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China)
出处
《内蒙古大学学报（自然科学版）》
CAS
北大核心
2022年第3期290-298,共9页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金(31971484)。
关键词
凋落物
植被指数
生态系统恢复
草地管理
litter
vegetation index
ecosystem restoration
grassland management
