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Evaluating Vegetation Growing Season Changes in Northeastern China by Using GIMMS LAI3g Data

机译：利用GIMMS LAI3g数据评估中国东北地区的植被生长季节变化

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Accurate understanding and detecting of vegetation growth change is essential for providing suitable management strategies for ecosystems. Several studies using satellite based vegetation indices have demonstrated changes of vegetation growth and phenology. Temperature is considered a major determinant of vegetation phenology. To accurately detect the response of vegetation to climate variations, this study investigated the vegetation phenology in the northeast (NE) region of China by using in-situ temperature observations and satellite-based leaf area index estimates (LAI3g) for the period 1982–2011. Firstly, a spatial distribution of the averaged phenology over the 30 years was obtained. This distribution showed that a tendency for an early start of the growing season (SoS) and late end of the growing season (EoS) was observed towards of the southeastern part of NE China, with the late SoS and early EoS occurring at higher latitudes. Secondly, the temperature-based and satellite-based phenological trends were analyzed. Then the significant advanced trend (SAT), significant delayed trend (SDT), and nonsignificant trend (NT) of SOS and EOS in NE region of China were detected by using the Mann-Kendall trend test approach. Finally, changes in phenological trends were investigated by using the temperature-based and satellite-based phenology method. A comparison of the phenological trend shows that there are some significant advanced trends of SOS and significant delayed trends of EOS in the NE region of China over 30 years. The results of this study can provide important support of the view that a lengthening of growing season duration occurred at the northern high latitudes in recent decades.
机译：准确了解和检测植被的生长变化对于为生态系统提供适当的管理策略至关重要。使用基于卫星的植被指数进行的多项研究表明了植被生长和物候变化。温度被认为是植被物候学的主要决定因素。为了准确地检测植被对气候变化的响应，本研究通过使用1982-2011年期间的原位温度观测和基于卫星的叶面积指数估计值（LAI3g），对中国东北（NE）地区的植被物候进行了调查。 。首先，获得了30年平均物候的空间分布。这种分布表明，在中国东北部东南部观察到了生长季开始（SoS）早期和生长季结束（EoS）晚期的趋势，SoS晚期和EoS晚期发生在较高的纬度。其次，分析了基于温度和基于卫星的物候趋势。然后采用Mann-Kendall趋势检验方法检测了中国东北地区SOS和EOS的显着先进趋势（SAT），显着延迟趋势（SDT）和非显着趋势（NT）。最后，通过使用基于温度和基于卫星的物候方法研究了物候趋势的变化。物候趋势的比较表明，在30年的时间里，中国东北地区存在一些明显的SOS先进趋势和EOS显着延迟趋势。这项研究的结果可以为近几十年来北部高纬度地区延长生长期的观点提供重要的支持。

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