Study On Biomass-Based Rapeseed (Brassica Napus L.)Aboveground Morphological Structure Model

On the basis of the domestic and overseas relative research progress, and the field experiments for varieties and fertilizer, and varieties, fertilizer, and density were conducted in2011to2012, and2012to2013, the morphological structural model of main stem leaves and branch leaves were constructed based on biomass using the system analysis method and mathematical modelling technique. The results were as follows:1. Biomass-based rapeseed(Brassica napus L.) aboveground structural modelsBased on the field experiments of cultivars and fertilizers in2011to2012, and the influence of nitrogen, RLW(Ratio of the leaf blade length to leaf blade dry weight), CPLB,(partitioning coefficient of blade to plant dry weight, CPLB) RTW(Ratio of leaf tangent angle to leaf blade dry weight), and RBW(Ratio of leaf bowstring angle to leaf blade dry weight) were presented. The models of biomass-based rapeseed aboveground structural model were built to predict the leaf geometric parameters (leaf blade length, leaf blade width, leaf blade petiole length, leaf blade bowstring length, and leaf blade angle), was verified using independent experiment data in2011-2012, and2012-2013, and the results showed that the model precision developed in this paper is high, apart from the leaf blade angle model and the partition coefficient model. On the whole, the most rapeseed morphological structural model developed in this paper had better consistency and better reliability in observation and simulation.2. Biomass-based rapeseed(Brassica napus L.) primary ramification structural modelsBased on the field experiments of cultivars and fertilizers in2011to2012, and the influence of nitrogen, the primary ramification morphological structural models such as rapeseed branch leaf blade length, branch leaf blade width, branch leaf blade bowstring length, branch length, and branch diameter were constructed taking the biomass as variables. The models were verified using independent experiment data in2011-2012, and2012-2013, and the results showed that the rapeseed primary ramification morphological parameters such as branch leaf blade length, branch leaf blade width, branch leaf blade bowstring length, branch length, and branch diameter of2011to2012observations and simulations of the da values and RMSE values were-1.900cm,5.033cm (n=125);-0.055cm,3.233cm (n=117);0.274cm,2.810cm (n=87);-0.720cm,3.272cm (n=90);0.374cm,0.778cm (n=514);0.137cm,1.193cm (n=514);0.806cm,8.990cm (n=145);-0.025cm,0.102cm (n=153), respectively. The correlation coefficient (R) for the observation and the simulation of the morphological parameters were significance at p<0.001level, but the dap values less than5%were the leaf blade length (the second leaves and the third leaves), the leaf blade bowtring length, primary ramification length, and the primary ramification diameter, which indicated that these models accuracy were high; more than10%were the leaf blade length (the first leaves and the forth leaves) and the leaf blade width, which indicated that these models accuracy were low.The da values and RMSE values of different rapeseed cultivar leaves PRCPLB for observed and simulated values were good, but the dap values between5%-10%were just no fertilizer treatment PRCPLBji(R19<j<R23),which indicated that model accuracy is better, and the others were more than10%, which indicated that the model accuracy is poor. The primary ramification leaves CPLB correlation coefficient (R) were significance at p<0.001,and p<0.01levels, respectively. The da values and RMSE values of various treatments the rapeseed PRLCPLB for observed and simulated values were good, but the dap values were above10%, which indicated that the model accuracy is poor, indicating that the model is still need futher improve ment in the futher work. On the whole, the test data of2011to2013is better, and the proposed model has well predictive.