地理学报 ›› 2019, Vol. 74 ›› Issue (1): 117-130.doi: 10.11821/dlxb201901009

• 气候变化与地表过程 • 上一篇    下一篇

中国耕地土壤相对湿度时空分异

潘汉雄1(),朱国锋1,2,3(),张昱1,郭慧文1,雍磊磊1,万巧卓1,马惠莹1,李森4   

  1. 1. 西北师范大学地理与环境科学学院,兰州 730070
    2. 中国科学院西北生态环境资源研究院 冰冻圈科学国家重点实验室,兰州 730000
    3. 甘肃省土地利用与综合整治工程研究中心,兰州 730070
    4. 武汉大学测绘遥感信息工程国家重点实验室,武汉 430079
  • 收稿日期:2017-10-31 出版日期:2019-01-18 发布日期:2019-01-18
  • 基金资助:
    国家自然科学基金项目(41661005, 41867030);中国博士后科学基金项目(2016T90961);国家自然科学基金委员会创新研究群体科学基金项目(41421061);冰冻圈科学国家重点实验室自主课题(SKLCS-ZZ-2017);农业农村部休耕轮作制度试点遥感监测专项(SCZG2017-ZB-2187/1-HT)

Spatial and temporal variations of relative soil moisture in China's farmland

PAN Hanxiong1(),ZHU Guofeng1,2,3(),ZHANG Yu1,GUO Huiwen1,YONG Leilei1,WAN Qiaozhuo1,MA Huiying1,LI Sen4   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
    2. State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou 730000, China
    3. Gansu Engineering Research Center of Land Utilization and Comprehension Consolidation, Lanzhou 730070, China
    4. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
  • Received:2017-10-31 Online:2019-01-18 Published:2019-01-18
  • Supported by:
    National Natural Science Foundation of China, No.41661005, No.41867030;Chinese Postdoctoral Science Foundation, No.2016 T90961;National Natural Science Foundation Innovation Research Group Science Foundation of China, No.41421061;Autonomous Project of the State Key Laboratory of Cryosphere Sciences, No.SKLCS-ZZ-2017;Remote Sensing Monitoring Special Project of Rotation and Fallow System in Pilot Regions under Ministry of Agriculture and Rural Affairs of the People's Republic of China, No.SCZG2017-ZB-2187/1-HT

摘要:

以全国653个农业气象站1993-2013年耕地的土壤相对湿度数据为基础,运用地统计方法,分析中国耕地土壤相对湿度时空分异特征与规律。结果表明:自1993年以来全国耕地的土壤相对湿度呈现波动上升趋势。全国耕地的土壤相对湿度普遍大于60%,分布区域自4月中旬开始随夏季风推移不断向北向西扩大,自10月下旬开始向东、南方向缩小。耕地土壤相对湿度值随土壤深度的增加而增加。年际尺度上,耕地的土壤相对湿度在夏秋季上升速度最快,变化幅度随土层深度增加而变小。土壤相对湿度与降水量存在较强的正相关关系,与潜在蒸发量、气温普遍存在较强的负相关关系。土壤相对湿度与各气象要素的相关性随深度加深而减弱。春、夏、秋季气象因素对旱地土壤相对湿度影响较大,冬季气象因素对水田影响更大。

关键词: 土壤相对湿度, 耕地, Kriging插值法, 相关性分析, 时空分异

Abstract:

Based on the data of relative soil moisture obtained from 653 agricultural meteorological stations in China during the period of 1993-2013, the spatial and temporal differentiations of relative soil moisture in China's farmland were analyzed and discussed by using geostatistical methods. The results show that the relative soil moisture of China's farmland has fluctuated and increased since 1993, exceeding 60% in general. The distribution area has been expanding to the north and west with the summer monsoon since mid-April, and in late October, the region began to shrink to the east and south. The value of relative soil moisture increases with the increase of soil depth, and the distribution of farmland in high-value area increases with the increase of soil depth. The relative soil moisture of farmland increases fastest in summer and autumn, and the range of change decreases with the increase of soil depth. There is a strong positive correlation between relative soil moisture and precipitation. Relative soil moisture has a strong negative correlation with potential evaporation and temperature. The annual mean value of relative soil moisture in paddy field is higher than that in dry land, and the difference between the annual mean values of relative soil moisture of two types of farmland increases with the increase of soil depth.

Key words: relative soil moisture, farmland, Kriging interpolation, correlation analysis, spatial and temporal variation