2008—2018年伊犁河流域植被净初级生产力时空分异特征
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国家社科重大项目(17ZDA064);新疆天山雪松计划项目(2020XS04)


Spatio-temporal characteristics of vegetation net primary productivity in the Ili River Basin from 2008 to 2018
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    摘要:

    基于MODIS数据和改进的光能利用率模型(CASA模型)对2008-2018年伊犁河流域植被净初级生产力(NPP)进行估算,通过一元线性回归趋势分析、变异系数、Hurst指数等方法对其时空分异特征进行分析。结论如下:(1)时间特征上,伊犁河流域植被NPP呈现波动上升趋势,年内植被NPP呈现出"单峰型"特点,该流域四季植被NPP大小关系为:夏季 > 春季 > 秋季 > 冬季;(2)空间特征上,伊犁河流域植被NPP呈现东北低西南高,沿天山山脉呈环状分布,各植被类型NPP的大小为:林地(624.13 g C m-2 a-1)>耕地(575.04 g C m-2 a-1) > 草地(270.57 g C m-2 a-1) > 裸地(114.26 g C m-2 a-1)。该流域植被NPP在海拔、经纬度方面均呈现不同的变化特征。(3)空间稳定性上,伊犁河流域植被NPP存在明显的空间差异性,各变异程度面积比例从大到小为:稳定(44.78%) > 不稳定(25.47%) > 比较稳定(16.46%) > 很不稳定(13.3%);(4)未来变化趋势上,伊犁河流域大部分地区植被NPP未来的变化趋势将以持续增加为主,未来变化趋势的面积比例大小为:持续增加(51.67%) > 由增加变为减少(31.75%) > 持续减少(9%) > 由减小变为增加(7.54%) > 无法预测(0.06%)。研究结果可为伊犁河流域的生态环境和社会、经济的可持续发展提供可靠的理论依据。

    Abstract:

    The MODIS data and the improved CASA model were used to estimate the vegetation net primary productivity (NPP) in the Ili River Basin from 2008 to 2018. The spatial and temporal differentiation characteristics of the Basin were analyzed by means of unary linear regression trend analysis, coefficient of variation, and Hurst index. The results are as follows:(1) In terms of temporal characteristics, the NPP of vegetation in the Ili River Basin fluctuated and increased. The annual NPP of vegetation in the Ili River Basin showed a single peak pattern. The relationship between the NPP of vegetation in four seasons in the Ili River Basin is as follows:summer > spring > autumn > winter.(2) In terms of spatial characteristics, the NPP of vegetation in the Ili River Basin was lower in the northeast and higher in the southwest, and was distributed in a circular pattern along the Tianshan Mountains. The NPP of each vegetation type was forestland (624.13 g C m-2 a-1) > cultivated land (575.04 g C m-2 a-1) > grassland (270.57 g C m-2 a-1) > bare land (114.26 g C m-2 a-1). The NPP of vegetation in the Basin showed different variation characteristics in altitude, longitude and latitude. (3) In terms of spatial stability, the NPP of vegetation in the Ili River Basin had obviously spatial differences. From large to small, the area proportion of variation degree was stable (44.78%) > unstable (25.47%) > relatively stable (16.46%) > very unstable (13.3%). (4) In terms of the future change trend, the NPP of vegetation in most areas of the Ili River Basin will continue to increase in the future, and the area proportion of the future change trend is continuous increase (51.67%) > from increase to decrease (31.75%) > continuous decrease (9%) > from decrease to increase (7.54%) > unpredictable (0.06%). The results can provide a reliable theoretical basis for the sustainable development of the ecological environment, society and economy in the Ili River Basin.

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刘亮,关靖云,穆晨,韩万强,乔雪丽,郑江华.2008—2018年伊犁河流域植被净初级生产力时空分异特征.生态学报,2022,42(12):4861~4871

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