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OALib Journal期刊
ISSN: 2333-9721
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长白山东坡植被指数变化及其对气候变化的响应
DOI: 10.3724/SP.J.1145.2014.08012, PP. 323-332
Keywords: 树轮宽度,气候变暖,落叶松,ndvi,年生物量生长量
Abstract:
长白山地处温带针阔混交林的中心地带，对气候变化较为敏感.因此，探讨长白山区落叶松（larixolgensis）树轮宽度和森林归一化植被指数（ndvi）与气候因子的关系，对于了解全球气候变暖背景下陆地生态系统的响应具有重要意义.以长白山自然保护区东坡为研究地点，利用东坡落叶松树轮宽度指数和选取1982-2006年umdgimmsndvi数据及天池气候数据，在分析树轮宽度及ndvi与气候因子关系的基础上，重点探讨长白山东坡落叶松径向生长与ndvi之间的关系，并利用多元回归分析建立落叶松树轮指数与气候因子及年生物量生长量与ndvi的模拟回归方程.结果显示：（1）1957年以来该区温度呈极显著上升趋势，冬季升温最为显著，降水呈微弱下降趋势.（2）1982-2006年年均、夏季和生长季ndvi均呈缓慢下降趋势.（3）长白落叶松年表特征分析表明其生长对气候敏感，适用于进行年轮气候学分析.（4）ndvi与月平均温度相关性较强，且多以正相关为主，与月降水量多为负相关性.（5）落叶松径向生长受当年生长季的气候因子的影响强于上年，但是显著相关的月份略有差异，并且降水的影响要优于温度.（6）落叶松树轮宽度和年生物量生长量与ndvi以负相关为主，生长季ndvi与树轮年表相关性较差，而非生长季ndvi与年表相关性较好.（7）林分单位面积地上生物量为240.72t/hm2，2009年林分生物量生长量约为2.91thm-2a-1，即每公顷每年固碳约1.46t，表明该地区老龄落叶松林仍具有较强的固碳能力.综上所述，在长白山地区，长时间序列的年轮宽度数据并不能很好地反映ndvi的长时期变化，利用树轮宽度指数重建该区ndvi有待进一步研究.
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