CHEN Dongxu,HUANG Xiaolin,CHEN Liugen,et al.Analysis of Soil Heat Flux Characteristics at Different Time Scales in Paddy Fields in the Middle and Lower Reaches of the Yangtze River[J].Research of Soil and Water Conservation,2021,28(04):151-158.
长江中下游地区稻田不同时间尺度土壤热通量特征分析
- Title:
- Analysis of Soil Heat Flux Characteristics at Different Time Scales in Paddy Fields in the Middle and Lower Reaches of the Yangtze River
- 文章编号:
- 1005-3409(2021)04-0151-08
- Keywords:
- paddy fields in the middle and lower reaches of the Yangtze River; soil heat flux; net radiation; soil temperature; soil water content
- 分类号:
- S161.2+1
- 文献标志码:
- A
- 摘要:
- 为了能更好地掌握地表能量收支状况,基于江苏省农业科学院溧水试验基地稻田2018年3月—2019年2月的土壤热通量(G)、土壤温度(T)、土壤含水量(VWC)以及净辐射(RN)观测数据进行不同时间尺度下G特征分析以及G与各因子间的相关性分析,探究了G在不同时间尺度和不同天气条件下的变化特征及其影响因素。结果表明:稻田G在半小时尺度上日变化呈“S”型。不同天气条件下,5 cm与10 cm深度G日变化程度和日总量均为晴天>阴天>雨天。不同水稻种植季节5 cm与10 cm深度G日总量均为稻季前>稻季>稻季后。该研究区全年G总量为负值。在半小时、日以及月尺度上,RN与G达到极显著相关; VWC在半小时和日尺度上与G达到显著相关,但不同季节VWC对G的影响并不一致,在水稻生长季,VWC与G呈正相关,在生长季之前及之后呈负相关; 类似地,T在日尺度和半小时尺度上与G达到极显著相关,且5 cm处T与G的关系最为密切。稻田生态系统中,G存在明显日变化与季节变化,并且不同时间尺度G受不同因子的影响也不同。
- Abstract:
- For the purpose of grasping the surface energy budget better, soil heat flux, soil temperature, soil water content and net radiation observation data from March 2018 to February 2019 in the paddy field of the Lishui Experimental Station were used to analyze the characteristics of soil heat flux on different time scales and the correlations between soil heat flux and various factors, and explore the characteristics and influencing factors on the soil heat flux in the paddy field on different time scales and under different weather conditions. The results showed that the diurnal variation of soil heat flux in the paddy field was ‘S' type on the half-hour time scale; under different weather conditions, the diurnal variation and daily total amounts of soil heat flux at 5 cm and 10 cm depth followed the order of sunny days>cloudy days>rainy days; the daily total amounts of soil heat flux at 5 cm and 10 cm depth in different rice planting seasons followed the order of pre-growth season>growing season>post-harvest season; the total amount of soil heat flux in the study area was negative for the whole year; on half hour, day and month scale, net radiation was significantly correlated with soil heat flux; soil water content was significantly correlated with soil heat flux on half hour and daily scale, but the effect of soil water content on soil heat flux was not consistent at different times, during the rice growing season, soil water content was positively correlated with soil heat flux and negatively correlated before and after the growing season; soil temperature was significantly correlated with soil heat flux on the daily and half-hour scales, and the 5 cm soil temperature was most closely related to soil heat flux. In conclusion, in the paddy field ecosystem, soil heat flux has obvious diurnal and seasonal changes, and soil heat flux is affected by different factors on different time scales.
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备注/Memo
收稿日期:2020-07-13 修回日期:2020-09-18资助项目:国家自然科学基金(41877151,41977409,42061144004)第一作者:陈东旭(1995—),男,江苏如东县人,博士生,研究方向为应用气象。E-mail:1193463103@qq.com通信作者:郝璐(1970—),女,内蒙古呼和浩特人,博士,主要从事应用气象研究。E-mail:haolu@nuist.edu.cn