A Simple Determination Method of Soil Moisture Content in Natural Grassland in Loess Area

Abstract

The invention relates to a simple determination method of the soil water content of natural grassland in loess areas. The simple determination method particularly comprises the following steps: step a, collecting plant leaves of the natural grassland in the loess areas; step b, converting the collected plant leaves into images by a scanner; step c, calculating the leaf areas by utilizing image analysis software, drying in a baking oven after scanning, determining the dry weight, and calculating the specific leaf area of each plant; and step d, collecting the water content at 0-10cm part of the soil surface layer of the grassland in the loess areas, and establishing an regression equation by combining with the obtained specific leaf areas of the plant leaves. Compared with a conventional method, the simple determination method has the advantages that the determined soil water content data is more accurate and reliable; the soil water content is determined indirectly by determining the specific leaf areas of the plant leaves, so that defects of the conventional soil water content determination method can be prevented maximally.

Description

technical field [0001] The invention relates to the field of soil detection, in particular to a simple method for measuring the soil water content of natural grassland in the loess region. Background technique [0002] With the implementation of the project of returning farmland to forest and grass in the loess area, the restoration of natural grassland vegetation and soil quality in the loess area has achieved remarkable results; water is an important part of soil, it not only affects the physical properties of soil, but also constitutes an important part of soil fertility Factors are the basic conditions for the survival of all plants. [0003] There are many methods for measuring soil water content in the prior art, such as drying method, electrical resistance method, neutron meter method, gamma ray (transmission) method, time domain reflectometer (TDR) etc., but due to soil structure, texture and bulk density There are certain errors in the determination of water conten...

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Problems solved by technology

[0004] The drying method is the most common method for measuring soil moisture content. The disadvantages are time-consuming and labor-intensive. The comprehensive cost is not low. Sampling will destroy the soil. Deep sampling is difficult. Errors caused by sampling transposition are inevitable during fixed-point measurement; resistance method There is a hysteresis effect, and the measurement range is generally only up to 100kPa. After drying, the contact between the resistance block and the soil is not good, and the sensitivity is very low; The large movement of the curve is caused. The research shows that the vertical resolution of the neutron meter is poor, and the neutron meter is expensive and has potential radiation hazards, so it cannot be widely used; the gamma ray method and the neutron meter method also have safety problems, making them The application is inconvenient; the water content of the soil surface measured by the TDR meter is much higher than that measured by the neutron meter, but it is not suitable for saline-alkali soil measurement

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