控制流域氮流失的最佳管理措施配置及效率评估

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Abstract In this paper, the single practice configuration and the comprehensive practices configuration were carried out respectively. Two evaluating methods including the load removal method, which was used to evaluate the configuration efficiency of BMPs from the perspective of pollution load reduction rate, and the R-R-V (Reliability-Resilience-Vulnerability) index method, which was used to evaluate the water quality improvement effect from the perspective of reliability, resilience and vulnerability, were both used in the Chaohe River Basin. The results showed that the effect of zoning comprehensive nitrogen loss practices was more ideal. The reduction rate of total nitrogen (TN) during the study year varied from 14.35% to 31.65%, and the average annual reduction rate was 24.98%. By the criteria for National surface water standard of Class II, the average annual R-R-V index of TN was 0.37, 0.24, and 95.78, respectively. The average annual reduction rate of multiple single practices was 17.48%, and the average monthly R-R-V index of TN was 0.36, 0.24, and 112.96, respectively. The R-R-V index reflected the reduction efficiency from multiple perspectives. Regardless of the configuration of single practices or the comprehensive practices, the improvement efficiency of reliability index and that of vulnerability index were higher (more than 14%), while the improvement efficiency of resilience index was lower. And in most cases, the improvement efficiency of reliability index and that of vulnerability index were higher than the TN reduction rate, while the improvement efficiency of resilience index was lower than the TN reduction rate. It shows that although the TN load has been reduced to a certain extent and is lower than the standard load in the short term, its ecological restoration is still difficult. The setting of the concentration corresponding to the standard load of nutrients is the key to evaluating the improvement efficiency of the R-R-V index. The stricter the evaluation standard, the more stable the R-R-V index of the nutrients to be evaluated.

Key words： Chaohe River Basin nitrogen loss best management practices load removal method R-R-V index method

Received: 06 July 2020

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	GUO Ying-zhuang
	WANG Xiao-yan
	ZHOU Li-li
	ZHENG Wen-xiu

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GUO Ying-zhuang,WANG Xiao-yan,ZHOU Li-li等. Configuration and efficiency evaluation of the best management practices to control nitrogen loss in the watershed[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 860-871.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/860

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