30-20CM深度土壤热通量年际变化趋势数据
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30CM-20CM层是主要农作物根系活跃层和土壤水分储存与输送的关键层。此处热通量的年际趋势是农业、生态和水资源管理的核心决策依据。夏季茂盛的植被会通过蒸腾作用大量抽取30-20cm深度的土壤水分，比较每年夏季高温伏旱期（例如7月下旬）同一时刻的热通量值，如果热通量值呈现出年际间持续降低的趋势，可能意味着：植被更加茂密，耗水增加，导致土壤变干。气候变得更加干旱炎热，蒸散需求加大，耗尽了土壤水。这为了解亚热带生态系统如何响应气候变化及其水分利用策略提供了关键证据。比较每年冬季（土壤温度最稳定时期）同一时刻的热通量值。趋势性增加：可能源于冬季降水增多（更湿）或昼夜温差加大；趋势性减少：可能源于冬季持续偏干。这为研究气候变化如何改变地表能量平衡和土壤水热动态提供了来自地下的、坚实的观测数据。
The 30–20 cm soil layer is the active root zone for major crops and a critical horizon for soil water storage and transport. The interannual trend of heat flux in this layer serves as a core decision-making basis for agricultural, ecological, and water resources management. Lush summer vegetation extensively extracts soil water from the 30–20 cm layer via transpiration. By comparing heat flux values measured at the same time during summer high-temperature and drought periods (e.g., late July) across different years, a sustained interannual decreasing trend in heat flux may indicate two potential scenarios: first, increasingly dense vegetation with elevated water consumption leading to soil desiccation; second, a more arid and hot climate with amplified evapotranspiration demands that deplete soil water. This provides critical evidence for understanding how subtropical ecosystems respond to climate change and their water use strategies. By comparing heat flux values measured at the same time during winter—the period when soil temperature is most stable—across different years, a trend of increasing heat flux may stem from either increased winter precipitation (wetter conditions) or an enlarged diurnal temperature range; a trend of decreasing heat flux may be attributed to persistent winter dryness. This provides solid subsurface in-situ observational data for studying how climate change alters surface energy balance and soil hydrothermal dynamics.
