锡林郭勒盟草原枯落物现存量时空变化及温度与降水的贡献

项目名称： 锡林郭勒盟草原枯落物现存量时空变化及温度与降水的贡献

项目编号： No.41301053

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 任鸿瑞

作者单位： 太原理工大学

项目金额： 26万元

中文摘要： 枯落物的蓄积是草地生态系统关键的生态过程之一，是控制草地群落结构和生态系统功能的重要因素。虽然在点尺度上已开展一些研究，但大尺度长时间序列上锡林郭勒盟草原枯落物现存量变化特征尚未明确，气候变化在其中的贡献尚未识别。本项目基于样地调查资料与地表反射率8天合成产品MOD09A1，在反演内蒙古锡林郭勒盟草原2000-2014年生长季每8天枯落物现存量的基础上，采用数学模拟与趋势分析方法，研究生长季内枯落物现存量的动态变化规律及其时空差异，分析生长季末期枯落物现存量年际变化趋势及其空间格局。结合同期及前期温度与降水数据，利用统计模型识别温度与降水对锡林郭勒盟草原枯落物现存量时空变化的贡献及滞后效应。本项目将为草地枯落物现存量研究提供新的方法，研究成果将有助于深入理解我国北方温带草原生态系统功能与过程，对预测未来气候情景下我国北方温带草原生态系统变化具有重要意义，为草原保护与合理利用提供科学依据。

中文关键词： 枯落物现存量；温带草原；遥感监测；时空变化；气候变化

英文摘要： Litter accumulation is one of the most important ecological processes in grassland ecosystems, is also a key factor in shaping community structure and ecosystem functioning. During the past three decades, some attempts have been made to investigate the dynamics of litter mass in growing season in Xilingol grasslands and their relationships with temperature and precipitation. However, at larger scales and in long time series, the spatial-temporal variations of litter mass in Xilingol grasslands have not yet been made clear, and the contributions of climate changes to these variations have not yet been identified. In the program, field survey data and Terra/MODIS surface reflectance 8-day composite product of MOD09A1 will be used to estimate 8-day dynamics of litter mass in growing season during 2000-2014 in Xilingol grassland. The mathematical models will be built to study the dynamics of litter mass in growing season. The ecological significance of the parameters in these models will be explored to analyze the spatial-temporal differences of the dynamics of litter mass in growing season in Xilingol grassland. The trend analysis method will be used to study the interannual variations of litter mass during late growing season. The Pearson's correlation coefficients derived from trend analyses will be adopted to re

英文关键词： litter mass；temperate grassland；remote sensing monitoring；spatial-temporal variations；climate change