The shortage of water resources in the North China Plain has become a major factor restricting the sustainable development of the first major water users, and the prospects are worrying. For example, many surface water bodies in the Hebei Plain are dry and the groundwater level continues to decline due to severe over-exploitation of groundwater. According to the data of 1996-19g7, the shallow groundwater over-exploitation amount is 15.6x10m/a, the local aquifer has been drained; the deep groundwater over-exploitation amount is 24.55×10m3/a. In the early 1960s, the shallow groundwater depth in the piedmont plain was between 1 and 10 m. In 2001, the shallow groundwater depth in the piedmont plain decreased to 4-40 m. The depth of the water level in the deep groundwater funnel center of Luzhou in the eastern coastal plain has dropped from 9.21m in 1972 to 100.88m in 2003. However, the waste of agricultural water in many places is still serious. At present, the development of agriculture is mainly at the expense of excessive use of water resources and sacrificing the environment. Obviously, this development is unsustainable. More than 70% of the precipitation in the North China Plain is converted into soil water (natural). Groundwater and surface water can only be used by crops after being converted into soil water (manual); soil water can be The only form of water resources that plants use directly. Soil water resources are of great significance for agriculture, forestry, animal husbandry, ecology and environmental protection. However, to date, soil water has not been sufficiently recognized and valued by all sectors of society as an important component of water resources. When people evaluate water resources, they still exclude the soil water that accounts for the largest share of water resources. This is agricultural water resources. A misunderstanding of the evaluation. The content and methods of soil water resources assessment have been recognized.
From the sea water source to the prison, and through crop transpiration, photosynthesis to form crop economic output, water in a series of conversion links, resulting in invalid losses. Among them, the soil moisture meter measures: l/3-l/2 in the field soil water consumption is invalid soil evaporation, transpiration consumption is not all effective. At present, the efficiency of agricultural water use in China is still low, and the potential for improving soil water use efficiency is great.
Therefore, studying the characteristics, survey and evaluation methods of soil water resources is the basis for the correct evaluation and rational use of agricultural water resources; exploring and promoting soil water use technology and effectively utilizing soil water are the key to the efficient use of limited water resources. The sustainable development and ecological environment protection of local agriculture, forestry and animal husbandry are of great significance. This book mainly takes the North China Plain as an example to discuss the theoretical and technical methods related to soil water resources and their effective use. More information: Soil Moisture Analyzer http://