盐碱地稻渔复合系统营养元素及其形态转化影响因子研究  

Nutrients and influencing factors of their morphological transformations of rice and fishery complex system in saline areas

作　　者：周琼 石伟 邱小琮[3] 杨涓[3] ZHOU Qiong;SHI Wei;QIU Xiao-cong;YANG Juan(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Aquaculture Technology Promotion Service Center,Yinchuan 750001,China;School of Life Sciences,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]银川市水产技术推广服务中心,银川750001 [3]宁夏大学生命科学学院,银川750021

出　　处：《西南农业学报》2023年第5期1074-1081,共8页Southwest China Journal of Agricultural Sciences

基　　金：宁夏回族自治区重点研发计划项目(2020BBF02009);宁夏高等学校一流学科建设(水利工程)项目(NXYLXK2021A03)。

摘　　要：【目的】了解盐碱地稻渔复合系统水体状况,探究营养元素及其形态转化与水环境因子之间的响应关系。【方法】于2021年4—9月对稻渔复合系统35个样点进行水样采集,测定10种水环境因子和6种形态的营养元素;应用相关分析、逐步回归和通径分析、灰关联分析和冗余分析(RDA)方法研究营养元素及其形态转化与水环境因子之间的关系。【结果】影响盐碱地稻渔复合系统氮素的主要因子是碱度、COD_(Mn)、pH、水温,影响磷素的是COD_(Mn)、水温、碱度,影响全钾的是电导率、TDS、Chl.a、碱度、盐度、COD_(Mn)、水温。对盐碱地稻渔复合系统氮素形态转化有主要影响的是碱度、COD_(Mn)、pH、水温,影响磷素形态转化的是碱度、电导率、盐度、Chl.a、pH。所以盐碱地稻渔复合系统营养元素主要影响因子为碱度、COD_(Mn)、水温,营养元素形态转化主要影响因子为碱度、pH。盐碱地稻渔复合系统营养元素及其形态转化的主要影响因子较为一致,主要因子为碱度、COD_(Mn)、pH及水温,其中COD_(Mn)与营养元素为正相关,水温与营养元素为负相关,碱度与氮素和总磷呈负相关,与正磷酸盐和全钾呈正相关,碱度、水温主要抑制营养元素含量上升,COD_(Mn)则有促进作用。【结论】盐碱地稻渔复合系统运作时间水温适宜,盐碱性质可以提高水体碱度,对抑制营养元素含量上升有正向作用,但随系统运作会使得COD_(Mn)上升,若增长过度需采取一定措施。【Objective】To understand the condition of water bodies of the rice-fishery complex systems in saline areas, the response relationships between nutrients and their morphological transformations and water environment factors were investigated. 【Method】From April to September 2021,water samples were collected at 35 sample sites, and 10 aquatic environmental factors and 6 forms of nutrients were determined in the system. Correlation analysis, stepwise regression and path analysis, gray correlation analysis and redundancy analysis(RDA) methods were applied to study the relationships between nutrients and their morphological transformations and aquatic environmental factors. 【Result】The main factors affecting nitrogen of the rice-fishery complex system were alkalinity, COD_(Mn), pH and water temperature in saline areas, the main factors affecting phosphorus were COD_(Mn), water temperature and alkalinity, and the main factors affecting total potassium were conductivity, TDS, Chl.a, alkalinity, salinity, COD_(Mn) and water temperature. Alkalinity, COD_(Mn), pH and water temperature were the main factors affecting the transformation of nitrogen forms of the rice and fishery complex system in saline areas. COD_(Mn), water temperature, alkalinity, conductivity, salinity, Chl.a and pH were the main factors affecting the morphological transformation of phosphorus. Therefore, the main influencing factors of nutrient elements of the rice-fishery complex system were alkalinity, COD_(Mn) and water temperature in saline areas, and the main influencing factors of nutrient morphological transformation were alkalinity and pH. The main influencing factors of nutrient elements and their morphological transformation of rice-fishery compolex system were relatively consistent in saline areas, the main factors were alkalinity, COD_(Mn), pH and water temperature, among which COD_(Mn )was positively correlated with nutrients. and water temperature was negatively correlated with nutrient elements. Alkalinity and water temperature

关 键 词：稻渔 营养元素 相关分析 通径分析 灰关联 冗余分析 

分 类 号：X171.3[环境科学与工程—环境科学] X832