首页> 中文期刊> 《农业工程学报》 >不同方法对保护性耕作的生态评价结果对比

不同方法对保护性耕作的生态评价结果对比

         

摘要

Comprehensive evaluation on agricultural production technologies can provide scientific base for technology application for agriculture production. However, a good comprehensive evaluation on agricultural production system must integrate the economic, ecological and environmental aspects of a production system. Agricultural production should not only focus on the yield increasing, but also should avoid the degradation of ecosystem services and alleviate the negative environmental impacts. Therefore, when selecting an appropriate agricultural technology for a production system, a comprehensive evaluation is needed for decision-make process. In recent decades, many kinds of theories and methods in the ecological economic research have been developed and some are used widely, such as emergy, ecosystem services, ecosystem health, ecological footprint, life cycle assessment, etc. However, each method has its independent theory base and calculation process. In additional, single method is hard to meet the multi-aspect evaluation needs. Therefore, to compare the results of different ecological evaluation methods, three methods including emergy (EM), ecosystem services (ES) and life circle assessment (LCA) were used in this research to evaluate economic, ecological and environmental concerns of an agricultural production technology. Four kinds of conservation tillage (CT) patterns in Jilin province, northeastern of China were taken as case study. The four CT patterns include‘direct-seeding on ridge side and standing-stubble return’ (CT1), ‘wide/narrow row alternation planting and high stubble mulching’ (CT2), ‘stubble mulching and direct-seeding on ridge’ (CT3) and‘cutting stubble combined ridge with subsoiling’ (CT4). The results showed that four kinds of CT methods had a consistent trend of advantage of eco-ecological effects compared to the conventional tillage (CK). Based on evaluation result of EM, the average value of EYR (emergy yield ratio) of the four CT methods was 9.6%higher than that of CK. The ESI (emergy sustainability index) of the four CT methods was 7.0% higher than that of CK. The total average value of ES of the four CT methods was about 2.1 times higher than that of CK. For the results of LCA, as compared to CK, the potential environmental effect of the four CT methods in term of energy consumption, greenhouse gas emission, acidification and eutrophication were lower, which accounted for 14.62%, 82.82%, 15.37% and 15.28% respectively of the CK (100%). The results also showed that the ranking order for the four CT were different for each of the evaluating result of EM, ES and LCA. For the result of emergy, the ranking of the four conservation tillage was: CT3>CT4>CT2>CT1. However, the ranking order was CT2>CT1>CT3>CT4 for ES and CT2>CT3>CT4>CT1 for the LCA method. These results indicated that multiple methods were needed for holistic evaluating the eco-ecological effects of agricultural technology. From our results we found that the EM method was mainly suited for evaluating the energy use efficiency and economic benefit, the ES method was more on the ecologic functions of maintenances, the LCA was suited for assessing the environmental impacts. The three methods were recommended as an integrated evaluation for agricultural technologies. Finally, combining evaluation results from of EM, ES and LCA, the ranking of the four CT methods was CT2>CT3>CT4>CT1. This research provided a comprehensive scientific tool for decision-making processes for agriculture technology selection, adoption and extension.%应用生态经济学方法对农业生产技术进行综合评价是农业技术应用决策的重要参考,目前国际上存在各种不同的生态经济学评价方法,许多得到较为广泛的应用。但是不同方法的理论基础和评价侧重点不同、自成体系,应用单一方法难以全面系统评价农业技术。因此,该文基于农业技术评价的经济效益、生态功能以及环境影响3个方面的需求,选择目前国际上热门的能值、生态系统服务、生命周期评价3种生态经济评价方法对吉林省4种保护性耕作模式:玉米留茬垄侧种植技术(CT1)、玉米宽窄行交替休闲种植技术(CT2)、玉米留茬直播种植技术(CT3)和玉米灭高茬深松整地种植技术(CT4)的评价结果进行综合比较,探索吸收各种方法的优点用于系统综合评价农业生产技术的生态经济和环境影响效应的可行性。能值评价结果表明,4种模式的能值产出率高于对照模式9.6%,技术选择优先序是 CT3>CT4>CT2>CT1;生态服务价值评价结果表明,4种模式的生态服务价值是对照模式的2.1倍,技术排序是:CT2>CT1>CT3>CT4;生命周期评价结果表明,4种模式的环境影响综合指数平均比对照模式低1.7%,技术排序为CT2>CT3>CT4>CT1。研究结果表明3种方法的评价结果均显示了保护性耕作模式对于传统耕作模式在生态、经济和环境影响等方面都具有综合优势。但是,不同研究方法对于同一具体技术的评价结果有一定的差异。根据3种方法评价结果的排名平均计算,比较科学的综合排名结果应该是:CT2>CT3>CT4>CT1。因此,采用单一方法难以全面系统评价某一具体的农业生产技术,在进行农业技术选择决策时,需要采取多方面、多方法进行综合评价,综合各种方法来选择合适的农业技术。

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