Studies On Observation Technique And Method In Root System

This experiment is adopt minirhizotron method,the quadrate monolith and glazing to observe the root system of Tunyu 46,and observe its root length,root broad and root weight in large scale observation system of Gucheng way of life and environment and Agricultural Meteorology of CAMS. according to the data, we has analyzed root length,the density of root length and the density of root weight which belong to maize and how to distribute in soil profile. It has obtained that the root system of Tunyu 46 decreased during the depth become deepening. At the course of spin in 0-40cm soil, the root length is accounted for 51.5% in whole soil depth; 76.2% in 0-80cm soil, 90.5% in 0-120cm soil. At the course of the late milk stage there is the same tendency resemble to the spin, the deepest root depth is reached 230cm and 8.288km·m-2 in the root gross length, this phenomenon is large than general summer corn apparently, and furthermore, it reflect that the Tunyu 46 is developed in its root system and has stronger resist to drought.According to glazing observation, find out that the root depth deeper than those far from glazing. The autumn corn's root depth is deeper then 300cm and 125cm root broad to the maximum. It makes clear that the root depth and broad are related to the environment condition which close to glazing or far from glazing.The image obtained from minirhizotron of underground root system room, which is high pertinent to manual panorama when joint with auto panorama, so it is substituted for manual panorama and spare time, achieve a single 360°observation for surround tube with auto panorama. According to the MATLAB image automatic processing, it can obtain the different levels for the density of root length in soil at E3 on August 4th and 25th , and choice the suitable contrast parameter for two days, as a result, it achieve automatic processing. It choice [0.48 0.5] for August 4th and [0.42 0.44] for August 25th, the related coefficient is 0.94 and 0.85 for two days, this prove that there is high pertinent to the quadrate monolith sampling data, using different levels of root length density and sampling data to set up regression equation, by mean of significance test and indicate that the equation is remarkable, and prove that the result in using minirhizotron to observe root system is relation to the quadrate monolith sampling data, so minirhizotron method might replace the manual quadrate monolith.At last, when we study at area E5,E7,E9,W4,W6,W8,W10,find out that the suitable contrast parameter is change from 0.4 to 0.6.If the grown conditions of the corn are close to the sampling region, and minirhizotron method can observe full intact root system, the processing result is high pertinent. On the contrary, the processing result is low pertinent. The origin of the error are different, on the first hand, the different grown conditions lead to different processing result and different quantity of root system; on the other hand, because of the observation is specify a definite location, there maybe no root system or less root system growing next to glass tube wall, lead to the quantity of root system reflect less from image, result in error outcome from process to the manual quadrate monolith.