Karst area soil nutrient reserve sampling and calculating method

A soil nutrient and calculation method technology, applied in the direction of removing certain component weighing, soil material testing, material inspection products, etc., can solve the problems of estimation uncertainty, without considering regional specificity, etc., and achieve accurate data acquisition , Reasonable design and strong operability

Inactive Publication Date: 2013-08-07
INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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Problems solved by technology

Preliminary research and data accumulation are far inferior to other regions in China. When estimating the status quo of major nutrient reserves at the national level, it is often analogized according to the red-yellow soil at the same latitude, without considering the particularity of the region, resulting in large discrepancies in the previous estimation. Certainty

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  • Karst area soil nutrient reserve sampling and calculating method
  • Karst area soil nutrient reserve sampling and calculating method
  • Karst area soil nutrient reserve sampling and calculating method

Examples

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Embodiment 1

[0027] A method for sampling and calculating soil nutrient reserves in karst areas, the steps of which are:

[0028] (1) Establish sample plots: select typical ecosystems in karst areas, and set up three standard sample plots of 20m×20m each with an interval of 25m under the condition that the site conditions are basically the same.

[0029] (2) Calculate the average soil thickness: first divide the sample plot into 16 small sample plots of 5m×5m, obtain 25 grid points each, measure the soil thickness of each grid point with an earth drill, and calculate the average soil thickness of the standard sample plot .

[0030] (3) Digging profile and sampling: In each standard sample plot, a typical soil profile is dug and sampled according to the average thickness of the soil. Since the soil layer is relatively thin, three ring knives are taken for every 10cm soil layer to measure the soil bulk density. Take 500g soil samples at the same time; divide 0-10, 10-20, 20-30, 30-40, 40-50...

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Abstract

The invention discloses a karst area soil nutrient reserve sampling and calculating method. The method comprises the steps that: (1) a dry land is selected at a karst area; (2) the sample land is divided into small samples, and soil augers are firmly drilled into soil in every network; (3) a soil profile stratified sample is dug from every land sample according to soil average thickness, and soil unit weights are determined by using cutting rings; (4) the soil samples are naturally air-dried in a shade, and are filtered; plant roots in soil samples in the cutting rings are removed, washed by using clear water, and bake-dried to constant weight; and the plant roots are weighed, such that root biomasses are obtained; (5) according to a soil organic carbon content and soil unit weight relationship scatter-plot established according to ecosystem soil profile data, organic carbon contents are determined, and soil unit weights are calculated; (6) soil nutrient densities are calculated according to soil volumes; and (7) according to soil nutrient densities of the samples of the ecosystem, unit-area soil nutrient reserve is obtained. The method is simple, easy, convenient, time-saving and labor-saving, and has high operability. With the method, karst area soil nutrient reserve data can be accurately obtained.

Description

technical field [0001] The invention relates to the technical field of soil cultivation, and more specifically relates to a method for sampling and calculating soil nutrient reserves in karst areas, which is applicable to the estimation of soil nutrient reserves in karst areas, the current status of carbon sequestration in typical ecosystems, and the like. Background technique [0002] Nutrient cycle research in terrestrial ecosystems is a frontier issue that is widely concerned by the international scientific community. theme. Developed countries, as leaders in global change science research, have continuously strengthened the research on nutrient cycle, and have put forward large-scale nutrient cycle scientific research plans in their respective countries or regions. After 2000, with the major knowledge innovation project of the Chinese Academy of Sciences "Research on Carbon Budget of China's Terrestrial and Offshore Ecosystems", the National Natural Science Foundation o...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N5/04
Inventor 宋同清彭晚霞杜虎曾馥平宋敏
Owner INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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