Evaluation of the comprehensive benefit of biodegradable mulch based on AHP-entropy weight method
In order to solve the problem of"white pollution"and realize the sustainable utilization of soil resources,the BioDegradable Mulch(BDM)could replace PolyEthylene(PE)plastic film in the north of Yinchuan City,Ningxia Province?Two kinds of BDM(F and X),common PE plastic film(PE)and non-mulching(CK)were set up in this area,and the field positioning experiment was carried out for 2 years.The comprehensive benefit and sensitivity of BDM were analyzed by using subjective weighting method(analytic hierarchy process),supplemented by objective weighting method(entropy weight),and combining with 9 indexes of three major benefits(economic benefit,technical benefit and ecological benefit).The results show that the comprehensive benefit index of F is the highest,followed by X,followed by PE,and the lowest is CK.Among them,F and X are 38.72％and 6.48％higher than PE,and 122.65％and 70.91％higher than CK respectively.Sensitivity analysis shows that compared with PE,the biggest sensitive factors of BDM are tomato yield and plastic film decomposition rate.To sum up,it is feasible to popularize and apply BDM in the production of the Yellow River diversion Irrigation District in the north of Yinchuan City,Ningxia Province,and BDM can be used instead of ordinary PE film.
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