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531.
Surface runoff and nitrogen (N) loss in a bamboo (Phyllostachys pubescens) forest under different fertilization regimes 总被引:2,自引:1,他引:1
Qichun Zhang Imran Haider Shamsi Jinwen Wang Qiujin Song Qiaoyun Xue Yan Yu Xianyong Lin Sayed Hussain 《Environmental science and pollution research international》2013,20(7):4681-4688
Nitrogen (N) losses from agricultural fields have been extensively studied. In contrast, surface runoff and N losses have rarely been considered for bamboo forests that are widespread in regions such as southern China. The thriving of bamboo industries has led to increasing fertilizer use in bamboo forests. In this study, we evaluated surface runoff and N losses in runoff following different fertilization treatments under field conditions in a bamboo (Phyllostachys pubescens) forest in the catchment of Lake Taihu in Jiangsu, China. Under three different fertilization regimes, i.e., control, site-specific nutrient management (SSNM), and farmer's fertilization practice (FFP), the water runoff rate amounted to 356, 361, and 342 m3?ha?1 and accounted for 1.91, 1.98, and 1.85 % of the water input, respectively, from June 2009 to May 2010. The total N losses via surface runoff ranged from 1.2 to 1.8 kg?ha?1. Compared with FFP, the SSNM treatment reduced total nitrogen (TN) and dissolved nitrogen (DN) losses by 31 and 34 %, respectively. The results also showed that variations in N losses depended mainly on runoff fluxes, not N concentrations. Runoff samples collected from all treatments throughout the year showed TN concentrations greater than 0.35 mg?L?1, with the mean TN concentration in the runoff from the FFP treatment reaching 8.97 mg?L?1. The loss of NO3 ?–N was greater than the loss of NH4 +–N. The total loss of dissolved organic nitrogen (DON) reached 23–41 % of the corresponding DN. Therefore, DON is likely the main N species in runoff from bamboo forests and should be emphasized in the assessment and management of N losses in bamboo forest. 相似文献
532.
光散射法传感器微站以其体积小、反应迅速、成本低等优点,已成为城市PM2.5规模化移动监测的新选择.由于其标准与传统标准台站不同,必须对这类微站的监测数据进行准确地校正.本研究利用2021年06月—2022年02月武汉市江夏区标准台站及同期传感器微站监测数据,探讨传感器微站监测误差与温度、相对湿度的关系,并通过随机森林回归(Random Forest Regressor,RFR)校正传感器微站PM2.5监测数据.对比单一RFR模型、按气象因素分类后RFR模型、“小波去噪+RFR”组合模型、“加权滑动平均去噪+RFR”组合模型校正效果,结果表明:RFR模型和分类后RFR模型均出现泛化能力差的问题,不能满足校正需求;“小波去噪+RFR”组合模型、“加权滑动平均去噪+RFR”组合模型平均绝对误差分别为8.77μg·m-3和4.78μg·m-3,平均相对误差分别为40.80%和18.13%.去噪组合模型能满足校正需求,且“加权滑动平均+RFR”组合模型校正效果明显优于“小波去噪+RFR”组合模型.研究结果可为... 相似文献
533.
秦皇岛探测环境变化对气象要素的影响 总被引:1,自引:0,他引:1
为分析秦皇岛地面气象探测环境变化对气象要素的影响,采用距平百分率和线性倾向估计及趋势系数等方法,对秦皇岛气象站(54449)新、旧站址搬迁前后1989—1998、1999—2008年各10年,与没有迁站的昌黎站做同期资料比较,结果表明:秦皇岛探测环境变化对气象要素有显著影响:年平均气温、年极端气温较迁站前显著下降,相对湿度增大,日照时数明显减少,雾日增多。指出气象要素变化除具有随时间变化的共同差异外,主要受探测环境变化的影响。 相似文献
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Lv Ling-Shuang Zhou Chun-Liang Jin Dong-Hui Ma Wen-Jun Liu Tao Xie Yi-Jun Xu Yi-Qing Zhang Xing-E 《Environmental science and pollution research international》2022,29(11):15791-15799
Environmental Science and Pollution Research - In the context of global climate change, studies have focused on the ambient temperature and mortality of cardiovascular diseases (CVDs). However,... 相似文献
538.
Gao Xueping Lv Mingcong Liu Yinzhu Sun Bowen 《Environmental science and pollution research international》2022,29(4):5415-5430
Environmental Science and Pollution Research - Understanding dynamic future changes in precipitation can provide prior information for nonpoint source pollution simulations under global warming.... 相似文献
539.
Liu Jiahui Chen Lv Zhang Xian 《Environmental science and pollution research international》2022,29(18):26190-26201
Environmental Science and Pollution Research - In natural water bodies, numerous cyanobacteria have the potential to intracellularly synthesize cyanotoxins, among which microcystin (MC) is the... 相似文献
540.
Kang Fei Lv Qi-lin Liu Jin Meng Yun-shan Wang Zi-he Ren Xue-qin Hu Shu-wen 《Environmental science and pollution research international》2022,29(49):74118-74132
Environmental Science and Pollution Research - Soil acidification is a problem widely occurring worldwide, which severely threaten food security and agricultural sustainability. Calcium... 相似文献