Abstract The development of fractional vegetation cover products for Australia that resolve cover into photosynthetic vegetation (FPV), non-photosynthetic vegetation (FNPV) and bare soil/rock (FBS) provides a new basis for examination of responses of vegetation cover to long term precipitation cycles, and to explore the interaction between these responses and land cover type, land use and other land surface properties. In this study, the relationship between accumulated antecedent precipitation (AAP) from 1 to 60 months and average monthly FPV and FNPV from the MODIS Fractional Cover Product is examined over a 17 year period from 2001 to 2018. The maximum R2 value, regression coefficients for the maximum R2, and number of accumulated months to the maximum R2 were mapped for each month of the year for FPV and FNPV. Behaviour of responses in relation to land use, land cover, and soil water holding capacity was analysed based on pixel frequencies of classes at sub-region scale in the Interim Biogeographic Regionalisation of Australia. The analysis showed that FPV is largely dependent upon AAP in the preceding 12 months, however responses to longer periods of AAP also occur in specific land use-vegetation type combinations. The study also showed that positive responses in FNPV could be driven by AAP from as much as 60 months, but that FNPV is reduced in many areas in response to increased AAP. The presence or absence of domesticated livestock grazing as defined by Australian land use mapping was a major influence on response to AAP of both FPV and FNPV with statistical analysis indicating interactions between major natural vegetation type and grazing. In highly responsive areas (R2 > 0.6) monitoring of land condition could be enhanced by testing of regional cover levels for major deviations from the long terms responses that might suggest land management concerns.

中文翻译：

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澳大利亚植被覆盖对累积前期降水的依赖：与光合和非光合植被部分的关系

摘要 澳大利亚开发的部分植被覆盖产品将覆盖分解为光合植被 (FPV)、非光合植被 (FNPV) 和裸土/岩石 (FBS)，为研究植被覆盖对长期降水的响应提供了新的基础。循环，并探索这些响应与土地覆盖类型、土地利用和其他土地表面特性之间的相互作用。在这项研究中，从 2001 年到 2018 年的 17 年期间，研究了 MODIS 部分覆盖产品中 1 到 60 个月的累积前期降水 (AAP) 与平均每月 FPV 和 FNPV 之间的关系。最大 R2 值，回归系数最大 R2 和累积到最大 R2 的月数映射到 FPV 和 FNPV 的一年中的每个月。根据澳大利亚临时生物地理区域化中子区域尺度的类的像素频率，分析了与土地利用、土地覆盖和土壤持水能力相关的响应行为。分析表明，FPV 在很大程度上取决于前 12 个月的 AAP，但在特定的土地利用 - 植被类型组合中也会出现对更长时期 AAP 的反应。该研究还表明，FNPV 的积极反应可以由 AAP 驱动，从长达 60 个月开始，但 FNPV 在许多领域因 AAP 增加而降低。澳大利亚土地利用制图定义的驯养牲畜放牧的存在与否对 FPV 和 FNPV 对 AAP 的反应有重大影响，统计分析表明主要自然植被类型与放牧之间的相互作用。