期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
四川丘陵农区地表水水质时空变化与污染现状评价 被引量:9
1
作者 陈尚洪 张晴雯 +4 位作者 陈红琳 郑盛华 吴铭 梅旭荣 刘定辉 《农业工程学报》 EI CAS CSCD 北大核心 2016年第S2期52-59,共8页
为分析四川丘陵典型农区种养格局对地表水水质的影响,于2013年3月至2015年2月,在四川丘陵区中江县选择响滩河7个监测断面和流域内4个研究点,研究了种植区、养殖区和种养混合区的地表水水体CODCr、TN、NO3--N、NH4+-N和TP的季节性变化规... 为分析四川丘陵典型农区种养格局对地表水水质的影响,于2013年3月至2015年2月,在四川丘陵区中江县选择响滩河7个监测断面和流域内4个研究点,研究了种植区、养殖区和种养混合区的地表水水体CODCr、TN、NO3--N、NH4+-N和TP的季节性变化规律与空间变化特征,并对地表水质污染现状进行评价。结果表明:响滩河7个监测断面枯水期主要污染物为CODCr、NH4+-N和TP,且分别比年平均值提高15.67%、59.35%和12.83%;丰水期主要污染物为TN,比年平均值提高19.27%。种养格局影响地表水中TN、NO3--N、NH4+-N和TP浓度的空间分布特征,不同区域之间养殖区>种养混合区>种植区;与种植区相比,生猪规模化养殖废污排放是造成种养混合区地表水污染的根本原因,其CODCr、TN、NO3--N、NH4+-N和TP浓度分别提高了17.79%、198.15%、132.10%、219.85%、567.57%。规模化养殖显著提高了地表水总污染指数,改变了地表水污染类型,种植区地表水污染类型为兼有CODCr污染的总氮污染型,而养殖区和种养结合区地表水均为兼有总磷污染的总氮污染型;种植区和种养混合区水质均达到劣Ⅴ类水质标准,种植区地表水为轻度污染,养殖区和受养殖业污染影响的种养混合区的地表水均为恶性污染,生猪集中养殖特别是规模化生猪养殖场废污排放加剧了受纳水体的污染程度。从水体污染治理角度,在种植区开展水土养分流失特别是氮素流失控制的同时,亟需加强区域生猪规模化养殖业粪污的无害化资源化循环利用技术研究与应用,以促进四川丘陵区规模养殖业健康发展与长江上游生态环境保护。 展开更多
关键词 养殖 水质 污染 四川丘陵农区 地表水
下载PDF
Current Situation and Influencing Factors of Pluriactivity in Mountainous and Hilly Rural Areas of Sichuan Province,China 被引量:4
2
作者 LIU Shao-quan ZHANG Hai-qin +1 位作者 XIE Fang-ting GUO Shi-li 《Journal of Mountain Science》 SCIE CSCD 2013年第3期445-454,共10页
In this study, the current situation of pluriactivity in mountainous and hilly rural areas of Sichuan province was analyzed using representative sample survey data and natural factor data calculated based on 30 m-reso... In this study, the current situation of pluriactivity in mountainous and hilly rural areas of Sichuan province was analyzed using representative sample survey data and natural factor data calculated based on 30 m-resolution DEM and GIS. Moreover, using logistic regression model, a quantitative analysis was conducted on factors influencing pluriactivity in terms of individuals, households, communities and natural environmental conditions. The results showed that, (1) only 17.77% of rural laborers in mountainous and hilly areas of Sichuan province were engaged in pluriactivity. Geographically, pluriactivity was mainly chosen according to the "proximity principle", and was concentrated in construction and service industries; (2) the following factors have a significant influence on whether rural laborers in hilly areas engage in pluriactivity: gender, number of years of education, marriage, number of laborers and time to towns. Those with little influence include: age, health, family size, arable land per capita and per capita income, whether there are elderly people over 75 years and children less than 3 years. According to the main factors affecting pluriaetivity, the government should enhance vocational skills training for rural laborers in mountainous and hilly areas, especially for female laborers, further improve transport accessibility and encourage rural laborers, especially female laborers to move into pluriactivity to increase the income of farm households. 展开更多
关键词 Mountainous and hilly areas Rurallaborers Pluriaetivity Influencing factors
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部